AP EAMCET · PHYSICS · Waves and Sound
If the frequency of a wave is increased by \(25 \%\), then the change in its wavelength is (medium not changed)
- A \(20 \%\) increase
- B \(20 \%\) decrease
- C \(25 \%\) increase
- D \(25 \%\) decrease
Answer & Solution
Correct Answer
(B) \(20 \%\) decrease
Step-by-step Solution
Detailed explanation
Frequency of wave, \(f \mu \frac{1}{\lambda}\) \(\therefore \frac{\lambda_2}{\lambda_1}=\frac{\mathrm{f}_1}{\mathrm{f}_2}=\frac{\mathrm{f}_1}{1.25 \mathrm{f}_1}=\frac{4}{5} \therefore \% \Delta \lambda=\frac{\lambda_1-\lambda_2}{\lambda_1} \times 100\)…
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