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STD 12 - 8. Electromagnetic waves — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 8. Electromagnetic waves4 Marks
MCQ
Which of the following is $NOT$ true for electromagnetic waves ?
  • A
    they consist of changing electric and magnetic fields
  • ✓
    they travel at different speeds in vacuum, depending on their frequency
  • C
    they transport energy
  • D
    they transport momentum
✓

Answer

Correct option: B.
they travel at different speeds in vacuum, depending on their frequency
b
Electromagnetic wave have constant velocity in a particular medium and it is independant of frequency and it is equal to $V =\sqrt{\frac{1}{\mu_0 \epsilon_0}}=3 \times 10^8\, m / s$

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