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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.
Verified Solution

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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