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Structure of Atom — Chemistry STD 11 Science — Question

Maharashtra BoardEnglish MediumSTD 11 ScienceChemistryStructure of Atom1 Mark
MCQ
Calculate the frequency if wavelength is $750 nm$.
  • A
    $2 \times 10^{14} Hz$
  • ✓
    $4 \times 10^{14} Hz$
  • C
    $6 \times 10^{15} Hz$
  • D
    $8 \times 10^{15} Hz$
✓

Answer

Correct option: B.
$4 \times 10^{14} Hz$
(b) : $\lambda=750 nm =750 \times 10^{-9} m , v =$ ?
$
u =\frac{c}{\lambda}=\frac{3 \times 10^8 ms ^{-1}}{750 \times 10^{-9} m }=4 \times 10^{14} Hz
$

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