You may need to conduct your own research to answer the following questions.

Extension Question 1

Show all working for the following questions.

• Calculate the velocity of a microwave with a frequency of 30 GHz and a wavelength of 9.5 mm. Give your answer in km/s.

• Calculate the frequency of a radio wave with a wavelength of 1.2 km and a velocity of 300,000 km/s. Give your answer in kHz.

• Calculate the wavelength of a light wave with a frequency of 500 THz and a velocity of 225,000 km/s. Give your answer in nm.

Extension Question 2

• What is the general name given to the type of waves produced during earthquakes?

• Name the three main types of earthquake waves and classify them as transverse, longitudinal or surface waves.

Extension Question 3

Compare and explain how the state of matter of the medium through which sound waves and light waves travel affects their velocity.