Two identical tuning forks vibrate at the same frequency
PHYSICS · Single correct · A Level · Physics · Waves · Waves
Problem
Two identical tuning forks vibrate at the same frequency. Fork B is struck so that the displacement amplitude of the sound waves it produces is three times that of Fork A. All other conditions are identical. Which of the following best describes the energy transmitted per unit time (power) and the perceived loudness of the sound from Fork B compared with Fork A?
(a) The power is nine times greater, and the sound is perceived to be nine times louder because each displacement is tripled.
(b) The power is nine times greater, and the sound is perceived as significantly louder than that from Fork A.
(c) The power is three times greater, and the sound is only slightly louder because the frequency is unchanged.
(d) The power is the same, but the sound is louder because the displacement amplitude is greater.