MCQ practice · SSC Physics Board questions · Chapter 7: Waves and Sound
If the time period of a particle of a wave is longer, what will happen?
Think it through first, then pick an option.
- a the frequency will fall
- b the frequency will rise
- c the frequency will stop
- d the frequency will stay the same
Answer and explanation
Correct answer: a the frequency will fall
Since f = 1/T, the longer the time period, the lower the frequency.
Why the other options are wrong
- b the frequency will rise: A higher frequency would mean a shorter time period. By f = 1/T, a larger T gives a smaller f.
- c the frequency will stop: The frequency does not stop; it only falls. However large T gets, f = 1/T never becomes zero.
- d the frequency will stay the same: f and T are reciprocals (f = 1/T). If one changes, so does the other.
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