Verified Answer :

SJ2006

pitch is directly proportional to frequency.so, 1000 Hz among frequency value.

Pitch is indirectly proportional to wavelength.so, 2 m wavelength among wavelength values. Now, it would only become 1/2 which is less than 1000 hz

OPTION B IS ANSWER

Explanation :

The frequency of a sound wave is defined as the number of vibration per second i.e.

\(u=\dfrac{1}{T}\)

T is the time period of the wave

The pitch of an instrument shows that the highness and the lowness of the sound wave. It depends on the frequency of the wave. The higher the frequency, the higher will be its pitch.

Hence, the correct option is (B) " 1000 Hz ".                                                                                                              

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