Visible light travels at a speed 3 point 0 times 10 to the 8th power of m over s If red light has a wavelength of 6 point 5 times 10 to the negative 7 power m , what the frequency of this light?
Answer
A
2 point 2 times 10 to the negative 15 power Hz
B
2 point 0 times 10 squared Hz
C
4 point 6 times 10 to the 14th power Hz
D
3 point 0 times 10 to the 8th power Hz
Explanation
Use the wave equation f = v/λ, where v is the speed and λ is the wavelength. Substituting the values gives f = (3.0 × 10⁸ m/s) ÷ (6.5 × 10⁻⁷ m) ≈ 4.6 × 10¹⁴ Hz. Therefore, the frequency is 4.6 × 10¹⁴ Hz, choice B.
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