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Question
The frequency of a wave is 1/10 Hz. The number of wavelengths that we get per unit time is
The frequency of a wave is 1/10 Hz. The number of wavelengths that we get per unit time is
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Solution
The correct option is B 1/10
Tip: Frequency can be fractional
Frequency is the number of crest and trough pairs that we get per unit time. This is equal to the number of wavelengths per unit time.
Hence, 1/10 crests and trough pairs will have to cross a point in unit time for a frequency of 1/10 Hz.
Recall: a crest and trough pair is similar to a compression and rarefaction pair. So, the number of compression and rarefaction pairs per unit time will also be equal to the frequency.
Tip: Frequency can be fractional
Frequency is the number of crest and trough pairs that we get per unit time. This is equal to the number of wavelengths per unit time.
Hence, 1/10 crests and trough pairs will have to cross a point in unit time for a frequency of 1/10 Hz.
Recall: a crest and trough pair is similar to a compression and rarefaction pair. So, the number of compression and rarefaction pairs per unit time will also be equal to the frequency.
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