46.Why do you not hear the sound of distant fireworks until after you see them?

51.Suppose a sound wave and an electromagnetic wave have the same frequency. Which has the longer wavelength?

52. Suppose that somehow a sound wave and an electromagnetic wave have the same wavelength. Which has the higher frequency?

54.Sound from source A has twice the frequency of sound from source B. Compare the wavelengths of sound from the two sources.

58.If a bell is ringing inside a bell jar, we can no longer hear it when the air is evacuated, but we can still see it. What differences in the properties of sound and light does this indicate?

68. What two physics mistakes occur in a science fiction movie that shows a distant explosion in outer space, where you see and hear the explosion at the same time?

72. Your classmate says that the speed of sound and the frequency of sound depend on the medium in which it travels. What part of this statement do you disagree with?

81. A piano tuner using a 264-Hz tuning fork hears 4 beats per second. What are two possible frequencies of vibration of the piano wire?

85. Ultrasonic waves have many applications in technology and medicine. One advantage is that high intensities can be used without danger to the ear. Cite another advantage of their short wavelength. (Hint: Why do microscopists use blue light rather than white light to see detail?)

88. A pair of loudspeakers on two sides of a stage are emitting identical pure tones (tones of a fixed frequency and fixed wavelength in air). When you stand in the center aisle, equally distant from the two speakers, you hear the sound loud and clear. Why does the intensity of the sound diminish considerably when you step to one side? (Suggestion: Use a diagram to make your point.)