1. What actually happens in a photoelectron experiment? Watch the computer simulation. First experiment. The metal selected is . A. Starting with red light, as the frequency increases, at what frequency do electrons start to be ejected? This is called the threshold frequency, which is the incoming energy.

B. As the frequency of light increases, what happens to the speed of the ejected electrons?

C. Does the number of ejected electrons increase, decrease or stay the same when the frequency of light above the threshold energy increases with the same intensity

D. Does the number of electrons increase, decrease or stay the same when the frequency of light above the threshold energy is kept constant, and the intensity of light increases?

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

-reverse card

russian is not my first language, so i'm afraid i can't write out an answer in russian, but hopefully you can find a way to do so. here's my best translation of the problem: you're given a plot of a particle's position in one-dimensional space over time, and you're asked to find either the total distance traveled by the particle after 6 seconds had elapsed, or the total displacement of the particle after 6 seconds.

if you want the total distance traveled, you would first need to determine the particle's velocity as a function of time, then integrate that over the 6-second interval. we know the position function is quadratic with roots at 0 and 6, so we have

where is unknown. because the position is parabolic, there is symmetry about the midpoint at , and we know that

so that the position function is

which means the velocity is

then the total distance traveled is

so the total distance traveled is 20 m.

on the other hand, if you want to find displacement: the particle starts at and ends at , so its displacement is 0.