Visible light consists of electromagnetic waves with wavelengths (in air) in the

Question

Visible light consists of electromagnetic waves with wavelengths (in air) in the range 400 - 700 nm. The speed of light in a vacuum is very nearly the same as speed of light in air and is represented by the constant "c". The value of "c" can be found in your front inside cover and is equal to 2.998x10^8 m/s. What are the frequencies of visible light?

1.33 × 1012 Hz to 2.33 × 1012 Hz

1.33 × 1014 Hz to 2.33 × 1014 Hz

4.28 × 1014 Hz to 7.50 × 1014 Hz

4.28 × 1012 Hz to 7.50 × 1012 Hz

1.33 × 1012 Hz to 2.33 × 1012 Hz

1.33 × 1014 Hz to 2.33 × 1014 Hz

4.28 × 1014 Hz to 7.50 × 1014 Hz

4.28 × 1012 Hz to 7.50 × 1012 Hz

Explanation / Answer

Here ,

for wavelength = 400 nm

as speed = wavelength * frequency

2.998 *10^8 = frequency * 400 *10^-9

frequency = 7.5 *10^14 Hz

Now , for 700 nm

as speed = wavelength * frequency

2.998 *10^8 = frequency * 700 *10^-9

frequency = 4.28 *10^14 Hz

the range of frequency is 4.28 × 10^14 Hz to 7.50 × 10^14 Hz

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