Radio telescopes (AQA A-Level Physics): Flashcards
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Practise the cards
10 cards from this deck
Discoverer of radio sources in space (1930s)
Discoverer of radio sources in space (1930s)
Karl Jansky
Why radio telescopes work on ground
Why radio telescopes work on ground
Atmosphere transparent to radio wavelengths
Primary component of a radio telescope
Primary component of a radio telescope
Parabolic dish antenna
Rayleigh criterion formula
Rayleigh criterion formula
Why radio telescopes need large dishes
Why radio telescopes need large dishes
Radio waves have long wavelengths (metres)
Location of largest single-dish radio telescope
Location of largest single-dish radio telescope
Arecibo, Puerto Rico
Operating advantage of radio vs optical telescopes
Operating advantage of radio vs optical telescopes
Can operate continuously day and night
Lower frequency limit for ground radio astronomy
Lower frequency limit for ground radio astronomy
30 MHz (ionosphere absorption)
Upper frequency limit for ground radio astronomy
Upper frequency limit for ground radio astronomy
60 GHz (water vapour absorption)
Advantage of 21 cm hydrogen emission
Advantage of 21 cm hydrogen emission
Can penetrate thick dust clouds