A) \[2\times {{10}^{6}}m\]
B) \[3\times {{10}^{6}}m\]
C) \[4\times {{10}^{6}}m\]
D) \[5\times {{10}^{6}}m\]
Correct Answer: B
Solution :
The relation between velocity of light (c) frequency (v) and wavelength \[(\lambda )\]is. \[c=v\lambda \] Thus, wavelength \[\lambda =\frac{c}{v}\] Given, c = 3 × 108 m/s, v = 100 Hz \[\therefore \lambda =\frac{3\times {{10}^{8}}}{100}=3\times {{10}^{6}}\,m\] Note: If light undergoes any medium other than air or vacuum, its frequency does not change.
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