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2. structure of atom — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry2. structure of atom1 Mark
MCQ
The frequency of an electromagnetic radiation is $2 \times {10^6}\,Hz$. What is its wavelength in metres (Velocity of light $ = 3 \times {10^8}\,m{s^{ - 1}}$)
  • A
    $6.0 \times {10^{14}}$
  • B
    $1.5 \times {10^4}$
  • ✓
    $1.5 \times {10^2}$
  • D
    $0.66 \times {10^{ - 2}}$
✓

Answer

Correct option: C.
$1.5 \times {10^2}$
c
(c) When $c = \nu \times \lambda $ than $\lambda = \frac{c}{\nu } = \frac{{3 \times {{10}^8}}}{{2 \times {{10}^6}}} = 1.5 \times {10^2}\,m$

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