Assertion : The skill in swinging to greater heights lies in the synchronisation of the rhythm of pushing against the ground with the natural frequency of the swing. Reason : Then the phenomenon behind this is resonance.
A
If both assertion and reason are true and reason is the correct explanation of assertion.
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B
If both assertion and reason are true and reason is not the correct explanation of assertion.
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C
If assertion is true but reason is false.
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D
If both assertion and reason are false.
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Solution
The correct option is A If both assertion and reason are true and reason is the correct explanation of assertion. The phenomenon of increase in amplitude when the driving force is close
to the natural frequency of the oscillator is called resonance. Swing is
a good example of resonance.