an ambulance driving 35.0 m/s emits a sound wave with a wavelength of 80.0 centimeters. as it drives away from a hospital, which of the following is the only possible frequency heard by the medical staff who are standing at the entrance? speed of sound is 343 m/s.

a 39.7 hz
b 43.8 hz
c 389 hz
d 429 hz

a sound technician is testing the sound acoustics in a theatre for an upcoming music concert. he sets up speakers in different locations and tests the sound levels in various seats in the theater. as he moves down the aisles of the theatre, he notices the pitch of the music gets lower. which description best explains why the pitch gets lower as the technician moves away from the speakers in the theater?

a diffraction between speakers
b interference of sound waves
c decrease in wave frequency
d increase in wave frequency

when a wave hits a boundary, what determines how much is reflected and refracted?

a angle and speed of wave
b wavelength and frequency of wave
c speed and frequency of wave
d angle and wavelength of wave

below you are given data about a wave in three different substances.

medium frequency wavelength
a 350 hz 0.75 m
b 350 hz 0.70 m
c 350 hz 0.65 m

part 1: based on the data above, is the period of a wave different due to the medium? explain.
part 2: based on the data above, is the wave speed of the wave different due to the medium? explain.
part 3: describe the cause and effect relationship for waves as they travel through different media.

if a transverse wave vibrates up and down three times each second, and the distance between wave crests is 2 meters, what is the speed of the wave?

a 1.5 m/s
b 0.66 m/s
c 5 m/s
d 6 m/s

during an ultrasound, sound waves are sent by a transducer through muscle tissue at a speed of 1300 m/s. some of the sound waves are reflected from a metal fragment in the muscle and are detected by the transducer 1.5 x 10−4 seconds after they were first emitted. what is the depth of the metal fragment in the muscle tissue?

a 0.20 m
b 0.87 m
c 1.2 m
d 2.8 m