Answer:
The angle of diffraction are 67.75 deg and 53.57 deg.
Explanation:
Given:
Davisson and Germer experiment with nickel target for electrons bombarding.
Voltages :
and
We have to find the angles that is
and
.
Concept:
- Davison Germer experiment is based on de Broglie hypothesis where it says matter has both wave and particle nature.
- When electrons get reflected from the surface of a metal target with an atomic spacing of
, they form diffraction patterns. - The positions of diffraction maxima are given by
. - An atomic spacing is
, when the principal maximum corresponds to n=1 - The wavelength is
, and
.
Solution:
Finding the wavelength at
.
⇒ 
⇒
nm
Plugging the values of wavelength.
⇒
⇒
⇒
degrees.
Now
For for the electrons with energy
,
the wavelength is.
⇒
nm
And
⇒
degrees.
So,
The angles of diffraction maxima are 67.75 deg and 53.57 deg.
Answer:
same value in R and 2R E = E₀ = σ / 2ε₀
Explanation:
For this exercise we use Gauss's law
Ф = E. dA =
/ε₀
We define a Gaussian surface with a cylinder with the base being parallel to the load sheet, so the electic field line and the normal line to the base are parallel and the scalar product is reduced to the algebraic product, in the parts the angle is 90º and the dot product is zero
As the sheet has two faces
2E A = q_{int} /ε₀
The charge inside the cylinder is
σ = q_{int} / A
q_{int} = σ A
We substitute
E = σ / 2ε₀
We see that this expression is independent of the distance, so it has the same value in R and 2R
E = E₀ = σ / 2ε₀
Answer:489 Revolutions
Explanation:
Given
Angular deceleration
Given wheel angular velocity =96 rad/s when machine is turned off
time taken by machine to reach zero angular velocity

0=96+(-1.5)t
t=64 sec
angular displacement is given by


For revolutions =
Answer: a) work done = 3946429.5 J
b) work done = 943.22 nutritional calories
Explanation:
Answer:
according to newton's first law of motion, when balanced forces are applied to an object:
- an object at rest stays at rest
- an object in motion continues its motion with a constant speed