(10. Five pupils have a mean mass of 51 kg.
Three of them have a mass of 49 kg,
53 kg and 52 kg. The fourth pupil is five
kilograms lighter than the fifth pupil.
What is the mass of the:
(a) fourth pupil?
(b) fifth pupil?

Which statement best describes who the period and frequency of electromagnetic was change between gamma rays and microwaves? a) the period and frequency stay the same. b) the period increases and the frequency decreases. c) the period decreases and the frequency increases. d) the period increases and the frequency increases.

The place you get your hair cut has two nearly parallel mirrors 6.00 m apart. as you sit in the chair, your head is 2.00 m from the nearer mirror. looking toward this mirror, you first see your face and then, farther away, the back of your head. (the mirrors need to be slightly nonparallel for you to be able to see the back of your head, but you can treat them as parallel in this problem.) how far away does the back of your head appear to be?

What are similarities and differences of reflection, refraction, diffraction and absorption?