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Read the given paragraph and answer the following question.
Two metal rulers of lengths 30 cm and 60 cm are kept in such a manner that 30 cm ruler extends about 15 cm over the edge of a table and a 60 cm ruler extends about 30 cm over the edge of same table. Both the free ends are flicked.
Which of the following statement is correct regarding this
i) The metal ruler of length 30 cm produces to vibrate slower
ii) The metal ruler of length 30 cm produces a high pitch sound
iii) The metal ruler of length 60 cm is able to vibrate faster
iv) The metal ruler of length 60 cm produces a low pitch sound

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Only (i) and (iii) are correct

Only (ii) and (iv) are correct

Only (ii) and (iii) are correct

Only (i) and (iv) are correct

answer is B.

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Detailed Solution

Pitch of sound depends on the frequency of vibrations, smaller length vibrates faster. So the frequency increases and sound produced is of high pitch.

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