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A-Level Physics Question Analysis - Physics - Waves and Propagation

A-Level Physics Question Analysis

· a-level physics,A-level Physics,propagation,waves

A-Level Physics Question Analysis Topic: Physics - Waves and Propagation

Exam Questions:

1) Which mode of propagation is used by short wave broadcast services?

2)
(a) Give three reasons why modulation of a message signal necessary for long distance transmission.
(b) Show graphically an audio signal, a carrier wave and an amplitude modulated wave.

Answers:

For A-Level Physics, you should know:

1) Short wave broadcast services with frequency ranges from a few MHz to 30 MHz employ sky wave propagation.

They are capable of traveling over very great distances and even around the globe.

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2)
(a) Modulation is a must for the following reasons:
Reduction in antenna height (i), prevention of signal mixing (ii), expansion of communication range (iii), capability of multiplexing (iv), and improvement of reception quality (v)

(b)

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Work hard for your A-Level Physics examination!

End of analysis. Great!

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