JEE Mains · Physics · STD 12 - Wave optics
- JEE Mains 2014
- Medium
- MCQ
Match List \(− I\) (Event) with List \(−II \) (Order of the time interval for happening of the event) and select the correct option from the options given below the lists
| List \(- I\) | List \(- II\) |
| \((1)\) 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 | \((iv)\) \(10^{-3}\, s\) |
Pick an option to check your answer.
Answer & Solution
Correct Answer
(A) \(( 1 )-(i), (2)-(ii), (3)-(iii), ( 4 )-(iv)\)
Step-by-step Solution
Detailed explanation
Rotation period of earth is about \(24\) hrs \(=\) \(10^{5} \mathrm{s}\)
Revolution period of earth is about \(365\) days \(=10^{7} \mathrm{s}\)
Speed of light wave \(\mathrm{C}=3 \times 10^{8} \mathrm{m} / \mathrm{s}\)
Wavelength of visible light of spectrum \(\lambda\) \( = 4000 - 7800\,\,\mathop {\text{A}}\limits^o \)
\(\mathrm{C}=\mathrm{f} \lambda\left(\text { and } \mathrm{T}=\frac{1}{\mathrm{f}}\right)\)
Therefore period of light wave is \(10^{-15} \,\mathrm{s}\) (approx)
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