David Sang Solutions for Chapter: Properties of Waves, Exercise 2: Questions

Write down an equation relating speed, frequency and wavelength of a wave. Indicate the SI units of each quantity.

If $10$ waves pass a point each second and their wavelength is $30 \mathrm{m}$, what is their speed?

All sound waves travel with the same speed in air. Which has the higher frequency, a sound wave of wavelength $2.0 \mathrm{m}$ or one with wavelength $1.0 \mathrm{m}$?

Which have the longer wavelength, radio waves of frequency $90 \mathrm{MHz}$ or $100 \mathrm{MHz}$?

Light slows down when it enters into water from the air. What happens to its speed?

Light slows down when it enters the water from the air. What happens to its wavelength?

Light slows down when it enters water from air. What happens to its frequency?