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10 September, 21:56

a. What is the frequency of radiation that has a wavelength of 11 μm, about the size of a bacterium? b. What is the wavelength of radiation that has a frequency of 5.30*10^14 s^-1? c. Would the radiations in part (a) or part (b) be visible to the human eye? d. What distance does electromagnetic radiation travel in 45.0 μs?

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  1. 10 September, 22:18
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    a) ν = 2.7 x 10¹³ s⁻¹

    b) λ = 5.7 x 10⁻⁷ m

    c) Neither will be visible

    d) d = 13,500 m

    Explanation:

    The relationship ν = c/λ where

    ν = frequency of the radiation

    c = speed of light = 3 x 10^8 m/s

    λ = wavelength of the radiation

    will be used to solve parts a), b) and c).

    For part d. we know that all electromagnetic radiation travel at the speed of light so d = speed x time

    a) ν = 3 x 10^8 m/s / 11 x 10 ⁻⁶ m (1 μm = 10⁻6 m)

    = 2.7 x 10¹³ s⁻¹

    b) λ = c/ν = 3 x 10^8 m/s / 5.30 x 10¹⁴ s⁻¹ = 5.7 x 10⁻⁷ m

    c) The visible spectrum range is 380 to 470 nm

    in a. converting to nm:

    11 x 10⁻⁶ m x 10⁹ nm/m = 11,000 nm

    in b. converting to nm:

    5.7 x 10⁻⁷ m x 10⁹ nm / m = 570 nm

    Neither of these radiations will be visible to the human eye.

    d) d = 3 x 10^8 m/s x 45 x 10⁻⁶ s = 13,500 m
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