Exams › SSC CGL (Prelims) › General

Light travels through vacuum at 3 x 10^8 m/s. If a particular light wave has a frequency of 6 x 10^14 Hz, determine its wavelength.

1. 0.5 micrometre
2. 2 micrometre
3. 0.05 micrometre
4. 5 micrometre

Correct answer: 0.5 micrometre

Solution

Using lambda = c / f, the wavelength is (3 x 10^8) / (6 x 10^14) = 5 x 10^-7 m. Since 1 micrometre = 10^-6 m, this equals 0.5 micrometre.

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