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7 May, 10:00

If light travels at 3 · 108 m/s and its frequency is 6 · 1015 Hz, then its wavelength is:

A) 10 · 107 m

B) 5 · 10-8 m

C) 5 · 10-7 m

D) 10 · 10-7 m

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Answers (1)
  1. 7 May, 11:07
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    Answer: 5*10^-8 (B)

    Explanation:

    -Given that the light is the speed

    -We will be following the formula:

    V = f (λ)

    Where,

    V is the velocity

    F is the frequency

    λ is the wavelength

    3*10^8 = (6*10^15) * λ

    (3*10^8) / (6*10^15) = λ

    5*10^-8m = λ answer

    Note: λ is initially 0.5*10^-7 but to make it in the standard form it should be 5*10^-8. And do not forget to place the unit for the wavelength i. e. meter (m) otherwise you may lose marks!
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