Q:

Given the formulae: speed = frequency × wavelength (v = fλ) and frequency is one over the period (f = 1/T), what is the wavelength of a light wave (speed = 3 × 108 m/s) whose period is 2 × 10−15 seconds?

waelhammad
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2022-10-20
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Given the formulae: speed = frequency × wavelength (v = fλ) and frequency is one over the period (f = 1/T), what is the wavelength of a light wave (speed = 3 × 108 m/s) whose period is 2 × 10−15 seconds?

  1. 1.5 × 10−7 m
  2. 6 × 10−7 m
  3. 1.67 × 106 m
  4. 1.5 × 1023 m
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waelhammad
2022-10-20
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B: first determine the frequency: f T = = ( ) × = × − 1 1 2 10 0 5 10 15 15 / / . Hz

Then rearrange the wave equation for wavelength : v f = = λ λ so v f / Then substitute the numbers: λ = = × ÷ × = × − v f / / 3 10 0.5 10 6 10 8 15 7 m s Hz m

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