Question Detail
Question
Light travels at a speed of 2.0 × 108 m/s in a glass block. In the glass, the wavelength of the light is 4.0 × 10-7 m. What is the frequency of the light?
Correct Answer
Option D is the correct answer.
Detailed Explanation
The relationship between the speed of a wave (v), its frequency (f), and its wavelength (λ) is given by the formula: v = fλ.We are given:Speed of light in glass, v = 2.0 × 108 m/sWavelength of light in glass, λ = 4.0 × 10-7 mWe need to find the frequency, f.Rearranging the formula: f = v/λf = (2.0 × 108 m/s) / (4.0 × 10-7 m)f = (2.0 / 4.0) × 10(8 - (-7)) Hzf = 0.5 × 1015 Hzf = 5.0 × 1014 Hz.
Hint
Remember the fundamental wave equation relating speed, frequency, and wavelength: v = fλ.