The frequency of green light is 6 x 10^14 Hz. Its wave length is:
Correct answer: B. 500 nm
- A. 50 nm
- B. 500 nm
- C. 5000 nm
- D. 100 nm
Explanation
Using the formula v = fλ, where speed of light in vacuum (v) = 3 x 108 m/sF = 6 × 14 Hzλ = v/f = 3 x 108 / 6 × 1014 λ = 500 nm
This question appeared on the ETEA MDCAT 2015 paper, which you can sit online with every answer explained.
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Wave speed is the rate at which a disturbance or wave pattern travels through a medium, given by v = fλ, where f is frequency and λ is wavelength. Questions examine how speed changes between media, the relation among frequency, wavelength and period, and why wave speed is not the same as particle vibration speed.
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