Question

Which of the following can be the wavelength of a high pich sound

• A. 5m
• B. 20cm
• C. 2000cm
• D. 200m

Answer 1

Answer:

B. 20cm

• Pitch is directly proportional to the frequency of a sound wave ($f$), and frequency is inversely proportional to wavelength

• A high-pitch sound has a high frequency, which results in a short wavelength.

• 20 cm is the shortest wavelength (and thus corresponds to a higher frequency/pitch) compared to 5 m (500 cm) and 2000 cm.