Fermi energy of conduction electrons in silver is 0.548 J. Calculate the number of such electrons in unit cm3
Answer:
[tex]n=1.86*10^{-30}m^3[/tex]
Explanation:
From the question we are told that:
Fermi energy of conduction electrons [tex]E_f=0.548J[/tex]
Generally the equation for Fermi energy is mathematically given by
[tex]E_f=\frac{3}{\pi}^2/3*\frac{h^2}{8m}*{n^{2/3}}[/tex]
[tex]E_f=\frac{3}{\pi}^2/3*\frac{h^2}{8m}*{n^{2/3}}[/tex]
[tex]{n^{2/3}}=\frac{E_f}{\frac{3}{\pi}^2/3*\frac{h^2}{8m}}[/tex]
Where
h= Planck's constant
[tex]{n^{2/3}}=\frac{E_f}{\frac{3}{\pi}^2/3*\frac{h^2}{8m}}[/tex]
[tex]{n^{2/3}}=\frac{0.548J}{3.62*10^{-19}}[/tex]
[tex]n=(1.51*10^{-20})^{3/2}[/tex]
[tex]n=1.86*10^{-30}m^3[/tex]
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a light ray reflects with an angle of 65 degrees what is the angle of refraction?
A. 65 degrees
B. 90 degrees
C. 32.5 degrees
D. 25 degrees
brainliest if correct
Answer:
A
Explanation:
what is matter explain
in physics the word medium means
A. A type of paint
B. A size.
C. A material or substance.
D. A psychic.
Answer:
the answer is C a material or substance
Explanation:
BRAINLIEST PLZZZZZZZZZZZZZZZ
why are nuclear reactions used in nuclear power plants
Answer:
Nuclear reactors are the heart of a nuclear power plant. They contain and control nuclear chain reactions that produce heat through a physical process called fission. That heat is used to make steam that spins a turbine to create electricity.
Answer:
A nuclear power plant's heart is made up of nuclear reactors. They contain and regulate nuclear chain reactions, which produce heat via a physical process known as fission. This heat is converted to steam, which powers a turbine to generate energy.
how does current flowing through a resistor affect the temperature
No links !!!!
Newton's First Law state
For every action there is an equal and opposite reaction.
An object in motion stays in motion unless acted upon by an unbalanced force.
Gravity acts on all objects that have mass.
Force= mass x acceleration
Answer: an object in motion stays in motion unless acted upon by an unbalanced force
Explanation: this is Newton’s first law of motion, which states that an object, whether in a moving or resting state, will continue to stay in that state unless there is an unbalanced force that changes that state. For a moving object, an example would be friction worth the ground. For a resting object, an example would be the force of a push.
The range of a projectile is the vertical height reached; True or False?
Answer:
False
Explanation:
The range of a projectile is the horizontal height reached
b) Find the value of xº from the following figure.
i.
ii.
yo
500 x
хо
2x0
Answer:
the value of the question is 1 because of the indicies rule.
Answer:
1
Explanation:
because
You have your headphones turned all the way up (100 dB).
a. If you want them to sound half as loud, to what decibel level must the music be set?
b. If you want them to sound 1/4 as loud, to what decibel level must the music be set?
Answer:
a. 90 dB
b. 80 dB
Explanation:
The given parameter of the sound is as follows;
The level to which the headphones are tuned = All the way up
The intensity of the sound of the headphones when tuned all the way up = 100 dB
a. The relationship between level change in loudness, ΔL, and the ratio of loudness, 'x', is presented as follows;
ΔL = 10·log₂(x) ≈ 33.22·log(x)
Therefore, for a sound to be half as loud, we have x = 1/2, therefore;
ΔL = 10·log₂(1/2) = 10·log₂(2⁻¹) = -10 ≈ 33.22·log(1/2)
The change in the intensity level for a sound half as loud, ΔL = -10 dB
Given that the sound was initially at 100 dB, the new level for a sound half as loud = 100 dB + ΔL = 100 dB - 10 dB = 90 dB
The decibel level the music must be set for a sound half as loud = 90 dB
b. In order for the sound to be 1/4 as loud, we have;
ΔL = 10·log₂(1/4) = 10·log₂(2⁻²) = -20
Therefore, the change in the level of the sound intensity level, ΔL by -20 dB will given a sound that is 1/4 as loud
The initial intensity level = 100 dB
The intensity level for a sound 1/4 as loud = 100 dB - 20 dB = 80 dB
measure the thickness of the brake rotor. how thick is the brake rotor? please help I've Kittery spent forever trying to do this
Answer:
Explanation:
its reading the caliper
as the 0 lines up w the 1/8" mark, it is 1 1/8"
Answer:
The minimum thickness will be stamped somewhere. You see there's part numbers and other things here you might need to use a wire brush to kind of clean it up but that's the thicknessUse a micrometer at the thinnest point on the surface of the rotor where it meets the pads to measure the minimum operational thickness. If your rotor needs to be cut or has worn passed this thickness, you'll need new rotors. You may also discover your rotor has Disc Thickness Variation.
which type of star cluster forms from tightly packed groups or older stars ?
binary
eclipse
globular
open
Globular star clusters form from tightly packed groups and/or older ancient stars.
What are globular star clusters?Globular star clusters can be defined as ancient stars packed in a spherical and/or symmetrical shape.
Globular star clusters represent the most common types of groups (i.e., clusters) of ancient stars.
These groups of stars (globular) are characterized to be densest in the center of the cluster.
In conclusion, globular star clusters form from tightly packed groups and/or older ancient stars.
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Te agrada realizaTe agrada realizar actividades físicas?, ¿por qué?r actividades físicas?, ¿por qué?
how is an earthquake's origin and intensity identified?
Answer:
using a seismograph
Explanation:
What the use of physics in our life
Answer:
the use of physics in our life is to be a science student.
Which two types of electromagnetic waves have higher frequencies than the waves that make up ultraviolet light?
o radio waves and infrared light
O visible light and X-rays
O microwaves and gamma rays
gamma rays and X-rays
Answer:
Gamma rays and x rays
Explanation: just took the test
Gamma rays and X-rays have higher frequencies than the waves that make up ultraviolet light. Hence option D is correct.
What is Electromagnetic Spectrum ?Electromagnetic spectrum is nothing but the range of wavelengths or frequencies on which electromagnetic radiation extend. it is whole distribution of electromagnetic waves according to frequency or wavelength. Electromagnetic wave is nothing but a photon which carries energy. Photon wave has frequency, wavelength as well as amplitude.
Electromagnetic spectrum is show in figure.
There is inverse relation between wavelength and frequency as υ = c/λ
where υ is the frequency, λ is the wavelength and c is the speed of light.
as wavelength increases, frequency decreases vice verse.
In this figure we can see that radio waves has highest wavelength hence it has lowest frequency. X ray and gamma rays has lowest wavelength hence it has highest frequency.
Hence option D is correct.
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S. Explain the washing effects of detergents of soap and why detergents in warm water washes greasy
clothes even better
Answer:
Soaps and detergents are made from long molecules that contain a head and tail the detergent molecules also help to make the washing process more effective by reducing the surface tension of the water. Surface tension is the force which helps a blob of water on a surface hold its shape and not spread out.
How does space exploration affect the economy of Florida?
A) Since rockets launched from Florida are paid for by the federal government, there is a positive effect on Florida's economy.
B) Since rockets launched from Florida pull tourists away from Disney World and local beaches, there is a negative effect on Florida's economy.
C) Since rockets launched from Florida must be purchased from companies located outside of Florida, there is a negative effect on Florida's economy.
D) Since rockets launched from Florida require hundreds of scientists and engineers to move to the area, there is a positive effect on Florida's economy.
Answer:
How does space exploration affect the economy of Florida?
A) Since rockets launched from Florida are paid for by the federal government, there is a positive effect on Florida's economy.
The equation below is used to calculate the mechanical advantage of an ideal wheel and axle.
mechanical advantage =
wheel radius
__________
axle radius
A student compares two wheel-and-axle simple machines. Machine 1 has a wheel radius of 50 centimeters, and an axle radius of 10 centimeters. Machine 2 has a wheel radius of 100 centimeters, and an axle radius of 10 centimeters. What is true of these simple machines’ mechanical advantage?
A.
Machine 1’s mechanical advantage is greater, which means that this machine can do more work with less force than Machine 2.
B.
Machine 1’s mechanical advantage is greater, which means that this machine can move faster than Machine 2.
C.
Machine 2’s mechanical advantage is greater, which means that this machine can do more work with less force than Machine 1.
D.
Machine 2’s mechanical advantage is greater, which means that this machine can move faster than Machine 1.
Answer:
b
Explanation:
Machine 2’s mechanical advantage is greater, which means that this machine can do more work with less force than Machine 1.
Mechanical advantageThe term mechanical advantage is the ratio of the radius of wheel to the radius of the axle for a wheel and axle system.
The true statement about the two machines that were compared; 1 and 2 is that, machine 2’s mechanical advantage is greater, which means that this machine can do more work with less force than Machine 1.
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A 19 kg ball has an initial velocity of 10 m/s. How much energy will be transformed into gravitational force?
Answer:
E = 950 J
Explanation:
The total amount of energy that can be transformed into gravitational energy will be equal to the kinetic energy of the ball at initial state:
[tex]E = K.E = \frac{1}{2} mv^2[/tex]
where, E = Energy = ?
m = mass of the ball = 19 kg
v = initial speed of the ball = 10 m/s
Therefore,
[tex]E = \frac{1}{2} (19\ kg)(10\ m/s)^2[/tex]
E = 950 J
An air track car with a mass of 0.55 kg and velocity of 5.8 m/s to the right collides and couples with a 0.45 kg car moving to the left with a velocity of 3.9 m/s. What is the combined velocity of the cars just after the collision?
Explanation:
Given:
m1 = 0.55 kg
m2 = 0.45 kg
vi1 = +5.8 m/a
vi2 = -3.9 m/a
Solve for V
m1vi1 + m2vi2 = (m1 + m2)V
(0.55 kg)(+5.8 m/s) + (0.45 kg)(-3.9 m/s) = (0.55 + 0.45)V
V = +1.46 m/a
This means that the combined mass after the collision is moving to the right at 1.46 m/s
You should set a reward for yourself for achieving a goal. A. True B. False
Answer:
A
Explanation:
Answer:
true
Explanation:
sup
Our founding fathers got many of their ideas about a republican
government from the Romans.
A: True
B: False
Fluorine and chlorine are members of which family?
Answer:
The halogens are the family of chemical elements that includes fluorine (atomic symbol F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). The halogens make up Group VIIA of the Periodic Table of the elements. Elemental halogens are diatomic molecules.
Elements: Fluorine; Iodine; Bromine; Astatine
Explanation:
HELLPPPPPPP FASTTTTBDJEJDJDJSJJWJWJW
Un cuerpo se mueve por una carretera que tiene rozamiento.¿Podríamos aplicar el principio de conservación de la energía mecánica? ¿Qué requisitos se han de cumplir para poder aplicarla?
Answer:
Sí se puede aplicar el Principio de Conservación de la Energía Mécanica siempre y cuando se considere los efectos de pérdida de energía a causa del rozamiento, de lo contrario, no se cumpliría el requisito de conservación derivado del citado principio de conservación.
Explanation:
Consideremos que el cuerpo representa nuestro sistema de estudio, el cual se desplaza por una carretera y experimenta rozamiento, significando cambios en la energía cinética y potencial gravitacional. La presencia de rozamiento indica una disipación de la energía del cuerpo, cuya energía mecánica total disminuye, significando un sistema no conservativo.
Sí se puede aplicar el Principio de Conservación de la Energía Mécanica siempre y cuando se considere los efectos de pérdida de energía a causa del rozamiento, de lo contrario, no se cumpliría el requisito de conservación derivado del citado principio de conservación.
You have viewed multiple unknown astronomical objects in this lab activity. In all tests, what was your test variable (independent variable)?
The amount of an element in each object
The type of elements in each spectrum
The astronomical object viewed by the spectrometer
Answer:
Could you give information about the lab
Explanation:
Answer:
The spectrum of each astronomical object
Explanation:
I took the test and got it right
Define Initial velocity.
Answer:
Initial velocity is defined as the velocity at time t=0.
Its Unit is m/s.
represented by u.
calculated by using formula.
v=u+at
u=v-at.
Answer:
Initial velocity is the velocity which the body has in the beginning of the given time period
Hope it helps
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A prism is often used to show the different wavelengths of light or colors that can be found in white light. In one paragraph, using your own words, explain how the prism causes these colors to appear. Be sure to use proper spelling, grammar, and punctuation.
Answer:
A prism causes the different wavelengths of light or colors that can be found in white light because the prism is white, and white light contains all colors in the visible light spectrum. So an object that reflects all the colors in the visible light spectrum will appear white in color because white light contains all colors in the visible light spectrum.
Explanation:
I hope this helps! I just did a test with this question and I got the answer right! This is the answer that I put. Good luck :)