Grade 11Wave Motion
1. Find the range of frequency of light that is visible to an average human being (400 nm < λ < 700 nm).
1 Answer
Aditi Chauhan
Sol. Given that, 400 m < λ < 700 nm.
1/700nm < 1/ λ < 1/400nm
⇒ 1/7 * 10^-7 < 1/ λ < 1/4 * 10^-7 ⇒ 3 * 10^8/7 * 10^-7 < c/λ < 3 * 10^8/7 * 10^-7 (Where, c = speed of light = 3 * 10^8 m/s)
⇒ 4.3 * 10^14 < c/λ < 7.5 * 10^14
⇒ 4.3 * 10^14 Hz < f < 7.5 * 10^14 Hz.
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