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Why does a tuning fork have two prongs?...

Why does a tuning fork have two prongs?

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The two prongs of a tuning fork set each other in resonant vibration. They help to maintain the vibrations for a longer time.
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A one-metre long stretched string having a mass of 40 g is attached to a tuning fork. The fork vibrates at 128 Hz in a direction perpendicular to the string. What should be the tension in the string if it is to vibrate in four loops ?

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An air column, closed at one end and open at the other resonates with a tuning fork when the smallest length of the cloumn is 50 cm. The next larger length of the column resonating with the same tuning frok is:

Assertion : When two tuning forks are vibrating with frequencies 256 Hz and 480 Hz are held near each other, beats cannot be heard. Reason : The principle of super position is valid if the frequencies of the oscillators are nearly equal.

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