Consider the de broglie wavelength of an electron that strikes the back face of one of the early models of a tv screen at 1/10 the speed of light. find the electron wavelength.

Explanation:

The De Broglie wavelength of a particle is given by

(1)

where

h is the Planck constant

p is the momentum of the particle

For the electron in this problem, which is relativistic, the momentum is given by

(2)

where:

is the relativistic factor

is the rest mass of the electron

is the speed of the electron

Substituting into (2), we find

and substituting into (1), we find the wavelength of the electron

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.

massxgravity x heght=weightxheight= pe

4900=490xh

h=10