End Of Unit Questions Flashcards
Which part of the EM spectrum is between x rays and visible light?
Ultraviolet radiation
The wave speed for all EM waves is 300 million m/s. What is the frequency for a wave with a wavelength of 300m?
1 million Hz
Which part of the EM spectrum transfers the least energy?
Radio waves
Which part of the EM spectrum is used to transmit signals to and from satellites?
Microwaves
How does visible light travel along an optical fibre?
Total internal reflection
What is the Doppler effect?
The observed change in wavelength and frequency of waves from a moving source
What is a galaxy?
A large group of stars
What has happened to the frequency of light that reaches earth from distant galaxies?
It has decreased and been shifted to the red end of the spectrum
How can we tell if light from a distant galaxy has been red shifted?
By observing the position of dark lines in the spectrum from the Galaxy
What has happened to the gamma radiation produced at the time of the Big Bang
It has redshifted to become microwaves
What piece of evidence can only be explained by the Big Bang theory?
Cosmic microwave background radiation
Which part of the EM spectrum has the longest wavelength?
Radio waves
