| List - I | List - II |
| (a) Rotation period of earth | (i) \[{{10}^{5}}s\] |
| (2) Revolution period of earth | (ii) \[{{10}^{7}}s\] |
| (3) Period of light wave | (iii) \[{{10}^{-15}}s\] |
| (4) Period of sound wave | (iv) \[{{10}^{-3}}s\] |
A) (1)-(i), (2)-(ii), (3)-(iii), (4)-(iv)
B) (1)-(ii), (2)-(i), (3)-(iv), (4)-(iii)
C) (1)-(i), (2)-(ii), (3)-(iv), (4)-(iii)
D) (1)-(ii), (2)-(i), (3)-(iii), (4)-(iv)
Correct Answer: A
Solution :
Rotation period of earth is about \[24hrs\simeq {{10}^{5}}s\]Revolution period of earth is about 365 days \[\simeq {{10}^{7}}s\]Speed of light wave \[C=3\times {{10}^{8}}m/s\]Wavelength of visible light of spectrum \[\lambda =-4000-7800\overset{\text{o}}{\mathop{\text{A}}}\,\,C=f\lambda \] \[\left( \text{and}\,T=\frac{1}{f} \right)\] Therefore period of light wave is \[{{10}^{-15}}s\] (approx)
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