ICSE Class 10 Physics 2014 Solved Paper

The adjacent diagram shows three different modes of vibrations P,Q and R of the same string.

Question : 43

Total: 66

State the ratio of wavelengths of P and R .

Solution:

Let frequency of vibration R be f . Then the frequency of vibration P is 3f .
∴‌‌fR=f‌ and ‌fp=3f
But ‌‌f∝‌

The ratio of wavelength of P and R i.e.,
λP:λR=1:3.

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