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Chapter 24: Q8PE (page 888)
A radio station utilizes frequencies between commercial AM and FM. What is the frequency of a 11.12-m-wavelength channel?
The frequencyof the 11.12 m wavelength channel is 26.98MHz .
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(a) Calculate the ratio of the highest to lowest frequencies of electromagnetic waves the eye can see, given the wavelength range of visible light is from 380 to 760 nm . (b) Compare this with the ratio of highest to lowest frequencies the ear can hear.
If electric and magnetic field strengths vary sinusoidally in time, being zeroat , then and . Let here.(a) When are the field strengths first zero? (b) When do they reach their most negative value? (c) How much time is needed for them to complete one cycle?
Find the intensity of an electromagnetic wave having a peak magnetic field strength of .
Electromagnetic radiation having a \(15.0\mu m\)wavelength is classified as infrared radiation. What is its frequency?
Suppose the maximum safe intensity of microwaves for human exposure is taken to be . (a) If a radar unit leaks 10.0 Wof microwaves (other than those sent by its antenna) uniformly in all directions, how far away must you be to be exposed to an intensity considered to be safe? Assume that the power spreads uniformly over the area of a sphere with no complications from absorption or reflection. (b) What is the maximum electric field strength at the safe intensity? (Note that early radar units leaked more than modern ones do. This caused identifiable health problems, such as cataracts, for people who worked near them.)
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