Sound MCQs

Q1. While a sound engineer listens, a loudspeaker emits a note of frequency 250 Hz whose wavelength measures 1.32 m; what is the speed of the sound?

• A.189.3939 m/s
• B.0.0053 m/s
• C.330 m/s
• D.251.32 m/s

Answer: C. 330 m/s

Wave speed = frequency * wavelength = 250 Hz * 1.32 m = 330 m/s. The speed of a sound wave equals how many waves pass per second times the length of each wave.

Q2. From a buzzer a tone of frequency 340 Hz spreads out with a wavelength of 1 m; at what speed does it propagate?

• A.341 m/s
• B.0.0029 m/s
• C.339 m/s
• D.340 m/s

Answer: D. 340 m/s

Wave speed = frequency * wavelength = 340 Hz * 1 m = 340 m/s. The speed of a sound wave equals how many waves pass per second times the length of each wave.

Q3. Out in the open a bell produces sound at 425 Hz with a wavelength of 0.8 m; what speed does the wave have?

• A.425.8 m/s
• B.340 m/s
• C.0.0019 m/s
• D.531.25 m/s

Answer: B. 340 m/s

Wave speed = frequency * wavelength = 425 Hz * 0.8 m = 340 m/s. The speed of a sound wave equals how many waves pass per second times the length of each wave.