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Tju [1.3M]
3 years ago
7

Do the conduction electrons in a copper wire act quantum mechanically or not? Roughly speaking, quantum mechanics comes in when

the de Broglie wavelength of an electron is comparable to or longer than the spacing between atoms. The lattice constant (roughly the spacing between atoms in a crystal) for copper is about 4 x 10-10 m. The drift velocity of electrons is typically less than 102 m/s under household conditions (b) What about atoms in the interstellar medium? Here we want to compare the average spacing between atoms (they move!) to the de Broglie wavelength of an atom. The interstellar medium is mostly hydrogen at an average density of order 1/cm3 and temperature about 3 K. In this case you' need the thermody- namic resul p/(2m)(3/2)kT, where k is Boltzmann's constant (c) Now let's switch gears to talk abou the Uncertainty Principle When LIGO detects gravitational waves, it is measuring displacements of its test masses of order 10-18 m. The test masses are about 40 kg. What is the minimum uncertainty induced in the velocities of the test masses?
Physics
1 answer:
Ksju [112]3 years ago
6 0

Answer:

I know the answer

Explanation:

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Identify the chemical change below
lesya [120]
Imma say go with C (:
5 0
3 years ago
Sneed with direction is called
Natali [406]

Answer:

abhudbhfbhbyfghsvcbnxzbncmbhdbekhvbfvsvbd bhjcayhvj

Explanation:

fevwygafjdbhsaukchavbgaekh

8 0
3 years ago
The fundamental frequency of a standing wave on a 1.0-m-long string is 440 Hz. What would be the wave speed of a pulse moving al
Nana76 [90]

Answer: v = 880m/s

Explanation: The length of a string is related to the wavelength of sound passing through the string at the fundamental frequency is given as

L = λ/2 where L = length of string and λ = wavelength.

But L = 1m

1 = λ/2

λ = 2m.

But the frequency at fundamental is 440Hz and

V = fλ

Hence

v = 440 * 2

v = 880m/s

4 0
3 years ago
Two objects, m1 = 0.6 kg and m2 = 4.4 kg undergo a one-dimensional head-on collision
Sidana [21]

a) The velocity after the collision.is 11.456 m/s.

b) The kinetic energy lost due to the collision is 44.564 J.

<h3>What is conservation of momentum principle?</h3>

When two bodies of different masses move together each other and have head on collision, they travel to same or different direction after collision.

The external force is not acting here, so the initial momentum is equal to the final momentum. For inelastic collision, final velocity is the common velocity for both the bodies.

m₁u₁ +m₂u₂ =(m₁ +m₂) v

Given are the two objects, m1 = 0.6 kg and m2 = 4.4 kg undergo a one-dimensional head-on collision. Their initial velocities along the one-dimension path are vi1 = 32.4 m/s [right] and vi2 = 8.6 m/s [left].

(a) Substitute the values, then the final velocity will be

0.6 x32.4 +4.4 x 8.6 = (0.6+4.4)v

v = 11.456 m/s

Thus, the velocity after collision is 11.456 m/s.

(b) Kinetic energy lost due to collision will be the difference between the kinetic energy before and after collision.

= [1/2m₁u₁² +1/2m₂u₂² ] - [1/2(m₁ +m₂) v²]

Substitute the value, we have

= [1/2 x 0.6 x32.4² + 1/2 x4.4 x 8.6²] - [1/2 x(0.6+4.4)11.456²]

= 44.564 J

Thus, the kinetic energy lost due to the collision is 44.564 J.

Learn more about conservation of momentum principle

brainly.com/question/14033058

#SPJ2

4 0
1 year ago
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A sound wave travels through water at 1,500 m/s. How far would it travel in 5 s?
hichkok12 [17]
7500m because 1,500 in 1 sec so 1500x5 7500
8 0
2 years ago
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