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