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Chapter 16: Q57PE (page 592)
A car has two horns, one emitting a frequency of 199 Hz and the other emitting a frequency of 203 Hz. What beat frequency do they produce?
The beat frequency produced by the two horns is 4 Hz.
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Give an example of a simple harmonic oscillator, specifically noting how its frequency is independent of amplitude.
Explain why you expect an object made of a stiff material to vibrate at a higher frequency than a similar object made of a spongy material.
What is the period of 60 Hz electrical power?
The middle-C hammer of a piano hits two strings, producing beats of 1.50 Hz. One of the strings is tuned to 260.00 Hz. What frequencies could the other string have?
(a) What is the intensity in W/m2 of a laser beam used to burn away cancerous tissue that, when 90.0% absorbed, puts 500 J of energy into a circular spot 2.00 mm in diameter in 4.00 s?
(b) Discuss how this intensity compares to the average intensity of sunlight (about 700 W/m2) and the implications that would have if the laser beam entered your eye. Note how your answer depends on the time duration of the exposure.
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