Question

1.A vibrating object completes 240 cycles in 15 s. What is its frequency, in hertz?
240 Hz
16 Hz
0.0625 Hz
15 Hz

2.A standing wave is set up in a pool 24 m long which contains six loops. What is the wavelength?
8m
24m
48m
4m

3.A jet is flying at Mach 1.5. If the speed of sound in air is 320 m/s, what is the speed of the jet in m/s?
480 m/s
500 m/s
340 m/s
321.5 m/s

Answer 1

#1. 240/15
#2. depends on what a "loop" is. If you mean a half-period, then 24/3
#3. 320 * 1.5 m/s

Answer 2

123