The frequency of oscillation of a simple pendulum is *f*_{1}. When the length of the pendulum *l *is increased to 2*l*, the frequency of oscillation of the simple pendulum is *f*_{2}. The value of the ratio f_{1}/f_{2} is__Solution__

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The answer is D.

The formula for the periodic time,

and we know that

Therefore, the formula for

Now we know that*

[* refer to this article]

Moving on,

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The formula for the periodic time,

*T*of a simple pendulum is given byand we know that

Therefore, the formula for

*f*of a simple pendulum is given byNow we know that*

[* refer to this article]

Moving on,

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**Question source:**Malaysia National Physics Competition Panel

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