5521382
Descrição
FlashCards por nadine pownall, atualizado more than 1 year ago
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Criado por nadine pownall
mais de 8 anos atrás
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| Questão | Responda |
| 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 |
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