$The diagram above illustrates a wave setup between two fixed ends 4.0m apart. If the speed of the wave is 1.0$ms^{-1}$, its wavelength and frequency respectively are$

The diagram above illustrates a wave setup between two fixed ends 4.0m apart. If the speed of the wave is 1.0 $ms^{-1}$ , its wavelength and frequency respectively are

1m; 0.25Hz

2m; 0.25Hz

2m; 0.50Hz

4m; 0.50Hz

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Correct answer is C

For the 4th harmonic, $L = 2\lambda$

$4m = 2\lambda \implies \lambda = \frac{4m}{2}$

= $2m$

Recall, $v = f\lambda$

$1 = f \times 2 \implies f = \frac{1}{2}$

= 0.50Hz

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