EM waves for communication (Edexcel GCSE Physics): Quizzes
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12 questions from this quiz
What property of radio waves in the EM spectrum is correct?
What property of radio waves in the EM spectrum is correct?
Longest wavelength, lowest frequency
What happens when radio waves are absorbed by a conductor like an antenna?
What happens when radio waves are absorbed by a conductor like an antenna?
They induce an AC at same frequency
How are radio waves generated?
How are radio waves generated?
By oscillations in electrical circuits
Why are radio waves useful for communication?
Why are radio waves useful for communication?
They penetrate walls and travel far
What is a transmitter?
What is a transmitter?
Device where electrons oscillate
What happens to electrons in a receiver when radio waves are absorbed?
What happens to electrons in a receiver when radio waves are absorbed?
They oscillate
What does a receiver generate if it is part of a complete circuit?
What does a receiver generate if it is part of a complete circuit?
An alternating current
What is the wavelength range of long wave radio?
What is the wavelength range of long wave radio?
1-10 km
Why can long wave radio be received without direct sight of the transmitter?
Why can long wave radio be received without direct sight of the transmitter?
Long waves bend around Earth's surface
Why can short wave radio signals travel long distances?
Why can short wave radio signals travel long distances?
Reflected by Earth's atmosphere
What is required for TV and FM receivers to get a clear signal?
What is required for TV and FM receivers to get a clear signal?
Direct line of sight with transmitter
Why are microwaves and radio waves suitable for satellite communication?
Why are microwaves and radio waves suitable for satellite communication?
They pass through Earth's atmosphere