Which term could be used to explain why someone could safely sit on a hot wooden bench but not a hot metal bench? A. Radiation B
2 answers:
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Answer: the force increases as the angle increases
Explanation:
If we assume the incline plane is frictionless, the only force acting on an object on the incline plane is the force of gravity:
where m is the mass and g the acceleration due to gravity.
However, the actual force that makes the object sliding down along the incline is not the gravity itself, but the component of the force of gravity parallel to the surface of the incline, which is given by
where is the angle of the incline.
Therefore, we see that as the angle of the incline increases, the force on the object increases.
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.