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Author Question: Early AM radios required very long antennae wires. FM antennae are often approximately a meter in ... (Read 105 times)

geoffrey

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on: Jul 27, 2018
Early AM radios required very long antennae wires. FM antennae are often approximately a meter in size. Can you surmise why sensitive FM aerials are much smaller than those AM wires?
 
  What will be an ideal response?

Question 2

A string of linear density 6.00 g/m is under a tension of 180. N. What is the velocity of propagation of transverse waves along the string?
 
  What will be an ideal response?


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mirabriestensky

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Reply #1 on: Jul 27, 2018
Answer to Question 1

A sensitive aerial has a size related to the wave length of the radiation (e.g. , /2, /4). AM, having a frequency a thousand times lower than FM, has wavelengths a thousand times larger, and early radios required a very sensitive antenna, unlike modern radios which have enormous amplification capability.

Answer to Question 2

173. m/s


geoffrey

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Reply 2 on: Jul 27, 2018
Thanks for the timely response, appreciate it

Sarahjh

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Reply 3 on: Yesterday
Excellent

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