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Question 20183
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Electromagnetic Waves and Wave Optics: Wavelength-Frequency MCQ

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Wavelength-FrequencyEasyQuestion 20183

Question

For EM waves in vacuum, the relation between speed c, wavelength λ, and frequency f is:
  1. A
    c = λ/f
  2. B
    c = f/λ
  3. C
    c = fλ
    Correct
  4. D
    c = λ²f

Correct answer

c = fλ

Explanation

c = fλ. All EM waves travel at c in vacuum, but different types have different frequencies and wavelengths: radio waves (long λ, low f) to gamma rays (short λ, high f).

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