Electromagnetic spectrum

Question	Answer
What is the unit of frequency ?	H
Which part of the electromagnetic spectrum transfers the most energy ?	Gamma rays
Which have the longer wavelengths , microwaves or radio waves ?	Radio waves
How are radio waves produced ?	By applying an alternative voltage to an aerial
What happens to the wavelength if a wave source is moving away from you ?	the observed wavelength increases
Which galaxies are moving fastest ?	The most distant ones
How does red-shift show that the universe is expanding ?	The furthest galaxies are moving the fastest so everything is expanding outwards
What is the Big Bang theory ?	The theory that the universe began with a massive explosion from a small initial point
What happens to the wavelength of radiation as it changes from gamma to microwaves ?	The wavelength increases

Resource summary

	Created by nadine pownall almost 8 years ago