Question

Statement I: The product of time period and frequency of a sound wave is always 1.
Statement II: Time period of a sound wave increases with increase in its pitch.

• 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.


Time period is equal to the inverse of frequency.
Time period = $\frac{1}{Frequency}$
=> Time period x Frequency = 1

Also, the pitch of a sound wave is determined by its frequency and frequency is inversely proportional to the time period of a sound wave. Therefore, as the time period of a sound wave increases, its frequency decreases. As a result, its pitch decreases.

Hence, statement I is correct and statement II is incorrect.