Successive peaks of a laser beam reach a detector every

PHYSICS · Subjective · CBSE · Physics · Electromagnetic Waves · Electromagnetic Waves

Problem

Successive peaks of a laser beam reach a detector every 1.9×10−15 s1.9\times10^{-15}\,\text{s}. Taking the speed of light as 3.00×108 m/s3.00\times10^{8}\,\text{m/s}, determine the wavelength of this light in nanometers and state whether it lies within the visible portion of the electromagnetic spectrum.

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