Question

Two sound waves, A and B, are traveling at the same speed. Wave A has a wavelength of 50 cm and a frequency of 7000 Hz. Wave B has a frequency of 3500 Hz—half the frequency of Wave A. What is Wave B’s wavelength? A. 14,000 cm B. 25 cm C. 3500 cm D. 100 cm

Answer 1

Answer:

D. 100 cm

Explanation:

The speed of a wave is the wavelength times the frequency.

v = λf

Wave A and B have the same speed, so:

λf = λf

(50 cm) (7000 Hz) = λ (3500 Hz)

λ = 100 cm