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Question
Which of the following has longest wavelength?
Which of the following has longest wavelength?
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Solution
The correct option is D Radio waves
Radiowaves have the longest wavelength in the electromagnetic spectrum. Radiowaves have frequencies from 300 GHz to as low as 3 kHz and corresponding wavelengths from 1 millimetre to 100 kilometres. The wavelength of gamma rays is less than 0.5×10−10 metre and have the least wavelength. The range of wavelength for ultraviolet rays is from 0.5×10−6 to 0.4×10−8 metre while range of red light is from 0.4×10−6 to 0.8−8 metre.
Radio waves
Radiowaves have the longest wavelength in the electromagnetic spectrum. Radiowaves have frequencies from 300 GHz to as low as 3 kHz and corresponding wavelengths from 1 millimetre to 100 kilometres. The wavelength of gamma rays is less than 0.5×10−10 metre and have the least wavelength. The range of wavelength for ultraviolet rays is from 0.5×10−6 to 0.4×10−8 metre while range of red light is from 0.4×10−6 to 0.8−8 metre.
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