Physics Past Questions and Answers

An electron of mass 9.1 x 10^-31 kg moves with a speed of 10⁷ms^-1. Calculate the wavelength of the associates wave[h = 6.6 x 10^-34Js]

A 9.0 x 10^-24m
B 4.55 x 10^-17m
C 7.25 x 10^-11m
D 6.20 x 10^-8m

Question 1317:

A particle is dropped from a vertical height h and falls freely for a time t. With the aid of a sketch, explain how h varies with
(a) t;
(b) t\(^2\).

Question 1318:

A particle is projected horizontally at 15ms\(^{-1}\) from a height of 20m.
Calculate the horizontal distance covered by the particle just before hitting the ground.
[g = 10 ms\(^{-2}\)]

Question 1319:

Explain why mercury does not wet glass while water does.

Question 1320:

(a) Explain what is meant by cations
(b) Draw and label an electrolytic cell