Radio telescopes (AQA A-Level Physics): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
Who discovered radio sources in space in the 1930s?
Who discovered radio sources in space in the 1930s?
Karl Jansky
Why can radio telescopes be located on the ground?
Why can radio telescopes be located on the ground?
Atmosphere transparent to radio waves
What component sits at the focus point of the parabolic dish?
What component sits at the focus point of the parabolic dish?
Receiver
What is the Rayleigh criterion formula for angular resolution?
What is the Rayleigh criterion formula for angular resolution?
Why do radio telescopes need much larger dishes than optical telescopes?
Why do radio telescopes need much larger dishes than optical telescopes?
Radio waves have longer wavelengths
What is the diameter of the Arecibo radio telescope?
What is the diameter of the Arecibo radio telescope?
305 metres
When can radio telescopes operate?
When can radio telescopes operate?
Both day and night
Below what frequency does the ionosphere strongly absorb radio signals?
Below what frequency does the ionosphere strongly absorb radio signals?
30 MHz
What can the 21 cm hydrogen line emission penetrate that visible light cannot?
What can the 21 cm hydrogen line emission penetrate that visible light cannot?
Thick dust clouds
Which source causes interference problems for radio telescopes?
Which source causes interference problems for radio telescopes?
Mobile phones