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

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry2. structure of atom1 Mark
MCQ
A hypothetical electromagnetic wave is show below.

(Image)

The frequency of the wave is $\mathrm{x} \times 10^{19} \mathrm{~Hz}$. $x=$ . . . .  (nearest integer)

  • ✓
    $5$
  • B
    $7$
  • C
    $9$
  • D
    $10$
✓

Answer

Correct option: A.
$5$
a
$\lambda=1.5 \times 4 \mathrm{pm}$

$=6 \times 10^{-12} \text { meter }$

$\lambda v=\mathrm{C}$

$6 \times 10^{-12} \times v=3 \times 10^8$

$v=5 \times 10^{19} \mathrm{~Hz}$

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