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P1 Physics > deck_3580620 > Flashcards

deck_3580620 Flashcards

1
Q

complete this sentence… radio stations broadcast signals at a…

A

particular frequency

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2
Q

what type of signal is used to reduce interference?

A

digital signal

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3
Q

what is a benefit of digital audio broadcasting?

A

a greater choice of radio stations

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4
Q

what is a disadvantage to digital audio broadcasting?

A

the audio quality is not good

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5
Q

what does DAB eliminate?

A

interference between other radio stations

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6
Q

complete this sentence… radio waves are reflected by the…

A

ionosphere

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7
Q

what does continued reflection of radio waves by the ionosphere allow?

A

allows radio waves to be received by aerials not in line of sight

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8
Q

complete this sentence… microwaves pass through…

A

the ionosphere, received by satellites, amplified and retransmitted back to earth

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9
Q

fill in the gap… radio waves are… when they meet an obstruction

A

diffracted

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10
Q

what is ghosting?

A

when the signal travels further and if the analogue produces a picture shifted to the right

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P1 Physics (8 decks)

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