Answers
The Planck model for the black body and the emission spectrum of the atoms allows to find the results for the peaks in the spectrum of stars is:
The general shape is that of a black body and the peaks are due to chemical compounds or elements in the star.
The stars are very hot celestial bodies by nuclear fusion processes, in a good approximation they approximate an ideal body that absorbs or emits all the radiation called black body.
A black body is a cavity in thermal equilibrium at a dated temperature with a small hole, this hole is the so-called black body and its emission spectrum was explained by Planck, with the assumption that the energy is
E = h νν
Where h is Planck's constant and ν is the frequency of the radiation. In the attachment we see the emission spectrum of a black body for various temperatures.
If in the material under study we have in addition the emission characteristics of some elements, it is energy appears as peaks in the emission spectrum and as black bands o valley in an absorption spectrum, therefore the existence of the structure is in a test of the existence of chemical elements within the stars.
In the attachment we can see the spectrum of a dwarf star where we can appreciate the spectrum of the black body and the emission and absorption lines of the chemical elements inside the star.
In conclusion using the Planck model for the black body and the emission spectra of the atoms we can find the results for the peaks in the spectrum of stars is:
The general shape is that of a black body and the peaks are due to chemical compounds or elements in the star.
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Related Questions
A roller coaster has a mass of 585 kg when fully loaded with passengers.
A)If the vehicle has a speed of 18.0 m/s at point a, what is the force (in N) of the track on the vehicle at this point?
B) What is the maximum speed (in m/s) the vehicle can have at point B in order for gravity to hold it on the track?
Point A says the radius is 10m. Point B says radius is 15m.
Answers
Answer:
Explanation:
I'm going to ASSUME that point A is at the bottom of a circular curve.
The track must support the weight of the car and also supply the needed centripetal force
F = mg + mv²/R
F = 585(9.81 + 18.0²/10) = 24,692.85
F = 24.7 kN
I'm going to ASSUME that point B is at the top of a circular curve.
The track must support the weight of the car and also supply the needed centripetal force.
At a minimum, the weight can be reduced to zero and all the gravity acceleration acts as centripetal acceleration.
0 = mg - mv²/R
g = v²/R
v = √Rg = √(15(9.81) = 12.1305399...
v = 12.1 m/s
How does the current in a resistor change if the voltage across the resistor is
increased by a factor of 2?
Answers
If the voltage across a resistor is increased by a factor of two, the current in the resistor doubles.
What is ohm’s law?When all physical parameters and temperature are constant, Ohm's law claims that the voltage across a conductor is directly proportional to the current flowing through it.
This current-voltage connection may be expressed mathematically as,
The Equation of Ohm's Law;
V∝I
V'∝I'
Hence, if the voltage across a resistor is increased by a factor of two, the current in the resistor doubles.
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Michael stands upright and allows his right arm to swing back and forth, naturally and without forcing, like a pendulum. He measures the time for 21 oscillations (complete cycles) to be 28.1 s. Assume his arm (length L) behaves as a simple pendulum, with an effective length of 2/3 L. Find the length of his arm, L.
Answers
Answer:
ytdgnrjjksmzjj3hfgbdhehkj jfjbcjbwbjrhrhb jdhbbjhhrhrhhjrjjr jfjnekrj
The length of his arm, L = 0.67 m.
What is time period?
A basic pendulum consists of a point mass hung by a tightly supported, weightless, and inextensible string.
T = 2π√ L/g, where L is the pendulum's length and g is the acceleration brought on by gravity, is the formula for a pendulum's period.
Given in the question the time for 21 oscillations (complete cycles) to be 28.1 s. Assume his arm (length L) behaves as a simple pendulum, with an effective length of 2/3 L.
T = 2π√ L/g
T = 2π√2l/3g
T = 28.1/21
T = 1.33
2π√2l/3g = 1.33
l = .67 m
The length of his arm, L = 0.67 m.
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Match up the following set of words with their definitions.
1) a measure of the force of gravity on an object, expressed as mass of the object times acceleration due to gravity
2) the amount of matter an object is made up of measured in grams 3) a push or pull
4) a numerical quantity, expressed by standard unit/s of measure
5) a number (rate) with a direction; a quantity that has both magnitude (measurable amount) and direction
6) refers to the application of more than one force on an object and, therefore, the combined effect (sum of forces)
net force
mass
Vector
Force
Magnitude
weight
Answers
Answer:
weightmassforcemagnitudevector net forceA baseball pitcher throws a fastball at a speed of 44 m/s. The acceleration occurs as the pitcher holds the ball in his hand and moves it through an almost straight-line distance of 3.5 m. Calculate the acceleration, assuming it is uniform. Compare this acceleration to the acceleration due to gravity.
Answers
v = s/t
44 m/s = 3.5 m/t
t = 3.5 m : 44 m/s
t = 0.08 s
a = v/t
a = 44 m/s/0.08 s
a = 550 m/s²
a : g = 550 m/s² : 10 m/s²
a : g = 55 : 1
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Which statement describes how nuclear power generation systems work?
O A.
The heat for the electricity generation process comes from nuclear fusion.
ов.
Electricity is generated directly when two atoms split into smaller ones.
O C.
The heat for the electricity generation process comes from nuclear fission.
OD.
Electricity is generated directly when two atoms join together.
Answers
Answer:
c- heat for electricity generation process comes from nuclear fission
Explanation:
nuclear fission is splitting of atoms to release energy held at nucleus of atoms
A machine has an efficiency of 15% . If the energy inputs is 300 joules, how much useful energy is generated
Answers
Answer:
you made with your performance, and then consider whether you would do anything differently if yo
Explanation:
The useful energy generated by the machine having an efficiency of 15% and an energy input of 300 J is 45 J
From the question given above, the following data were obtained:Efficiency = 15% = 0.15
Work input = 300 J
Work output =?The useful energy generated (i.e work output) by the machine can be obtained as follow:
[tex]Efficiency = \frac{workout}{workin} * 100\\\\0.15 = \frac{Workout}{300}[/tex]
Cross multiply
Work output = 0.15 × 300
Work output = 45 JTherefore, the useful energy generated by the machine is 45 J
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Brainliest! :)
Please complete the following:
You and Tim, who is larger than you, are outside with a wagon. Tim (the bigger person) gets in the wagon and you (the smaller one) pull it. As you pull it, you accelerate until you reach a comfortable velocity. Then you stop and switch places with Tim. Tim now pulls you in the wagon, accelerating from a stop to a comfortable velocity. Now, Tim may be bigger than you, but you have been working out and are just as strong as Tim, so the force that Tim uses to pull the wagon is the same force that you used. You both pull with the exact same amount of force. Who was riding in the wagon when it had the greatest acceleration during start up? Why? Use Newton’s second law to explain.
Now Sara comes along, and she is the exact same size as you. However, she is even stronger than you! When she pulls you in the wagon, she pulls with a greater force than when you pull her. Now who is in the wagon when it has the greatest acceleration? Explain, using Newton’s second law.
Answers
Answer:
First scenario,
From 2nd Newton's law
F = ma
from the above eqn, it's evident
a = F/m
that is to say, acceleration is inversely proportional to mass
The greater the mass, the smaller the acceleration and the higher the acceleration, the smaller the mass.
Thus, You was in the wagon when it had the greatest acceleration because You has the smaller mass and thus the acceleration will be greater.
Second scenario,
Since Sara pulls with greater force and Force is directly proportional to acceleration according to the second Newton's law,
F = ma
then, when You is in the wagon it had greater acceleration since they have the same mass.
All the best!
A hunter is practicing hitting a target that is down range. If the arrow leaves the bow at a
velocity of 26 m/s at an angle of 40 degrees above the horizontal,
a. Calculate how much time it takes for the arrow to return to the bow level.
b. Find out how far down range the arrow goes.
c. What is the maximum altitude the arrow reaches?
Answers
Answer:
What kind of bow Is he using
Which kind of bond forms ions?
Answers
Answer:
Ionic bond
Explanation:
Hope it helps ya
GUYS I NEED HELP RIGHT NOW
Answers
b you should know this no need to explain if you dont know well I'm sorry its b
What is a common noun?
Answers
I HOPE IT WILL HELP YOU.
Thank you.
TEDDYLOVER
can someone help with this plss
Answers
Answer:
push,weight,friction
Explanation:
Bcs it has 3
Why do you think some things float and some things sink?
Answers
the weight on each foot of an elephant 500n. what will be the contact force
Answers
Answer:
The weight of an object is the force it exerts due to gravity. Pressure is force per unit area, or force divided by area over which the pressure is exerted.
Explanation:
1. For Jo:
1. For Jo:force = 500 N
1. For Jo:force = 500 Narea = 0.0001 m^2
1. For Jo:force = 500 Narea = 0.0001 m^2pressure = F/A = 500N/0.0001m^2 = 5,000,000 N/m^2
What is three famous people you know
Answers
Answer:
Martin Luther King Jr., Mark Zuckerburg, Jeff Bezos
Explanation:
First 3 people to come to my head.
how did the Ojibwe protect walleye populations?
a.) they count the total number of walleye eggs that a female lays each year.
b.) did you Spears to catch walleye.
c.) they only fish for walleye at night.
d.) they said a limit on the number and size of Walleye a spearfisher can catch.
Answers
The Ojibwe protected walleye populations as D. They said a limit on the number and size of Walleye a spearfisher can catch.
Wisconsin Walleye War was a series of protests regarding the fishing and hunting rights of the Ojibwes. Wisconsin wanted to regulate the rights of the people whenever they went fishing and hunting.
The protest eventually led to the state speaking to the people. This resulted in a resolution that there should be a limit on the number and size of Walleye a spearfisher can catch.
This was necessary in order to preserve the walleye for future generations.
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During hypnosis, people:
A. can accurately recall memories of early childhood and infancy.
B. lose all awareness of their surroundings.
C. temporarily suspend their sense of initiative.
D. are in a deep trance, which is similar to stage 3 NREM sleep.
Answers
During hypnosis, people temporarily suspend their sense of initiative. Hence, option (C) is correct.
What is hypnosis?
According to one definition, hypnosis is "a waking state of awareness, (or consciousness), in which a person's attention is diverted from his or her immediate surroundings and is consumed by interior experiences such as feelings, cognition, and images." In order to induce hypnosis, the subject must concentrate and become sufficiently absorbed in their imagination. A hypnotic world is created by the physician and patient through the use of suggestions and their acceptance.
Our everyday 'trance' states include things like becoming lost in a good book, driving down a familiar route without being aware of it, being in prayer or meditation, or engaging in a mindless or creative task. Our conscious awareness of our surrounds and an inner awareness exist on a continuum, thus even though one's emphasis is mostly internal in these states, one does not necessarily lose all awareness of the outside world.
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The muscular system consists of exclusively this kind of tissue.
Answers
Answer:B
Explanation:
Each muscle or organ is composed of skeletal muscle tissue, connective tissue, nerve tissue, and blood or vascular tissue. Thus, the muscular system consists of all types of tissue.
What is the muscular system?The Muscle fibers are specialized cells that make up the muscular system. Its ability to contract is its main characteristic. Muscles that are attached to bones, internal organs, or blood arteries are what move things. Muscle contraction is the primary cause of almost all bodily movement. A skeletal muscle on its whole is a part of the muscular system.
Muscle cells, also known as muscle fibers or monocytes (mostly in skeletal and cardiac muscle), make up the majority of the organs that make up muscles (mainly in smooth muscle).
By contracting and pushing food to the small intestine through a process known as peristalsis, the muscles surrounding the stomach aid in the flow of food through the digestive system.
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What is motivation in your own world
Answers
Answer:
Motivation is the process that initiates, guides, and maintains goal-oriented behaviors.
A driver spotted a police car and he braked from a speed of 100 km/h to a speed of 80 km/h during a displacement of 88 m at a constant acceleration? What is that acceleration, and how much time is required for the given decrease in speed?
Answers
Answer:
Explanation:
100 kph = 27.8 m/s
80 kph = 22.2 m/s
v² = u² + 2as
a = (v² - u²) / 2s
a = (22.2² - 27.8²) / (2(88))
a = -1.578282828...
a = -1.58 m/s²
t negative sign means the acceleration opposes the initial velocity.
t = Δv/a
t = (22.2 - 27.8) / -1.57828
t = 3.52 s
Kinetic and Potential energy
Answers
The main difference between potential and kinetic energy is that one is the energy of what can be and one is the energy of what is. In other words, potential energy is stationary, with stored energy to be released; kinetic energy is energy in motion, actively using energy for movement.
Two rowboats on a lake are lined up, in contact, front to back in the same direction. A passenger in the rear boat pushes the front boat directly forward with a force of 40 N.
How much force does the front boat exert on the rear boat?
A. 0N
B. 20N
C. 40N
D. 80N
Answers
The answer is C. 40N.
2
8
1 point
What is the name of the element with 2 energy levels and 6 valence electrons?
Sulfur
Oxygen
Barium
Chromium
G
9
1 point
Answers
Answer:
oxygen is the right answer.
in loading a long lorry a man lifts boxes each of weight 100N and height of 1.5M.how much energy is transfered when one box is lifted
Answers
Explanation:
energy=100×1.5=150 joules
Describe the relationship between temperature and kinetic
energy.
Answers
Answer:
temperatures is directly proportional to kinetic energy
Explanation:
in increasing the temperature,kinetic energy also increases
hope it helps...
in 10 minutes a heart can beat 700 times at this rate in how many minutes will a heart beat 140 times at what rate can a heart beat
Answers
_____ is to Alzheimer's disease as _____ is to Parkinson's disease.
A. Dopamine; serotonin
B. Serotonin; norepinephrine
C. Acetylcholine; dopamine
D. Norepinephrine; serotonin
Answers
Answer:
C. Acetylcholine; dopamine
Acetylcholine is to Alzheimer's disease dopamine as is to Parkinson's disease. That is option C.
Neurological disordersThe neurological disorders are does diseases that affect the nervous system of an individual.
Examples of the neurological disorder include:
Alzheimer's disease: This occurs in individuals that have low levels of the neurotransmitter, acetylcholine. The acetylcholine activates muscles and help in short-term memory, and learning.Parkinson's disease: This occurs in individuals that have low levels of the neurotransmitter, dopamine. Dopamine plays a role in sending messages to the part of the brain that controls movement and coordination.Therefore, Acetylcholine is to Alzheimer's disease dopamine as is to Parkinson's disease.
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The weight of an object is 180 N at a distance of 150 km above a planet's center. What is the weight of the object when it moves 450 km above the center of the planet?
Answers
By using Newton law of gravitation, the weight of the object when it moves 450 km above the center of the planet is 20N
Given that the weight of an object is 180 N at a distance of 150 km above a planet's center.
F = GMm/[tex]r^{2}[/tex]
F = mg = 180N
r = 150
When it moves 450 km above the center of the planet, G, M and m will be constant. only r will vary.
180 = GMm/[tex]150^{2}[/tex]
Make GMm the subject of the formula
GMm = 180 x 22500
GMm = 4050000
As it moves 450 km above the center of the planet, Its weight will be
F = GMm/[tex]r^{2}[/tex]
Substitute all the values and parameters
F = 4050000/[tex]450^{2}[/tex]
F = 20 N
Therefore, the weight of the object When it moves 450 km above the center of the planet is 20 Newtons
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Help me with these questions pleaseeee!
Answers
go through the list and ask yourself whether or not it depends on something else..
does this make any sense?
