Chapter 20 Review Questions

Frequencies of sound that are too high for the human ear to hear are called

(a) faster than the speed of sound

(b) supersonic

(c) infrasonic

(d) ultrasonic

(e) subsonic

For the same temperature for air, does sound travel faster in humid Galveston or in dry El Paso?

(a) Galveston

(b) El Paso

(c) same speed in either city

The bending of sound through air of uneven temperature is called

(a) reflection

(b) refraction

(c) interference

(d) reverberation

(e) resonance

Lightning is seen, then ten seconds later thunder is heard. Approximately, how far away in feet is the thunder cloud?

(a) 10,500

(b) 5280

(c) 1050

(d) 5250

(e) 105

A 250 Hz tuning fork and a 260 Hz tuning fork are vibrating near each other. How many beats per second are heard?

(a) 255

(b) 510

(c) 10

(d) 250

(e) 260

Which of the following isn't true concerning the metal rod that I vibrated in class by stroking it along its length?

(a) the lowest frequency had a node in the middle

(b) the vibration was longitudinal

(c) there were antinodes at the ends

(d) the lowest frequency had a wavelength equal to the length of the rod