Question

Statement I: If the time period of a source of sound is 0.1 s then the sound is inaudible to the human ear.
Statement II: The frequency range of hearing in humans is 10 Hz to 10 kHz.

• A.
  Statement I is correct and statement II is incorrect.
• B.
  Statement I is incorrect and statement II is correct.
• C.
  Both statement I and statement II are correct.
• D. Both statement I and statement II are incorrect.

Answer 1

The correct option is A

Statement I is correct and statement II is incorrect.
Given:
Time period of sound wave = 0.1 s
Then,
Frequency of sound wave
= $\frac{1}{Timeperiod}$
= $\frac{1}{0.1}$
= 10 Hz
We know that the frequency range of hearing in humans is 20 Hz to 20 kHz but the given sound wave has a frequency of 10 Hz which lies in the infrasonic range and is inaudible to humans.
Therefore, statement I is correct and statement II is incorrect.