Assertion (A): When we start filling an empty pitcher with water, the pitch of the sound produced goes on decreasing. Reason (R): The pitch of sound increases with increase in frequency. 1. Both A and R are true and R is the correct explanation of A 2. Both A and R are true and R is not the correct explanation of A 3. assertion is false but reason is true 4. assertion is true but reason is false.

assertion is false but reason is true. Explanation Assertion (A) is false. As the pitcher fills up, the air column or amount of air inside the bottle decreases. The frequency of the note produced = , where v is the velocity of sound in air and L is length of air column, which is equal to depth of water level from the open end. As the pitcher is filled with water, L decreases. Therefore, frequency of sound produced goes on increasing. With increasing frequency the pitch of the sound produced also increases. Reason (R) is true. The pitch of sound increases with increase in frequency.

Physics

Assertion (A): When we start filling an empty pitcher with water, the pitch of the sound produced goes on decreasing.
Reason (R): The pitch of sound increases with increase in frequency.
Both A and R are true and R is the correct explanation of A.
Both A and R are true and R is not the correct explanation of A.
assertion is false but reason is true.
assertion is true but reason is false.

Sound

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