Consider gamma rays, X-rays and UV rays travelling in a vacuum. All of these are traveling with ________.

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  1. same frequency but different speeds
  2. same speed but different wavelengths
  3. same wavelength but different speeds
  4. same speed and same frequency

Answer (Detailed Solution Below)

Option 2 : same speed but different wavelengths
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Concept:

Electromagnetic (EM) Spectrum:

The electromagnetic (EM) spectrum is the range of all types of EM radiation arranged according to frequency or wavelength. In order of decreasing wavelength or increasing frequency these are: Radio waves radiation, Micro waves radiation, Infrared, visible light, Ultraviolet, X-rays and gamma rays.

  • In a vacuum, all EM radiations travel at the same speed irrespective of the wavelength or frequency of the wave.
  • Since, all EM radiations travel at the same speed, X-rays, gamma rays and UV rays will travel at the same speed.
  • Since, every EM radiations have different wavelengths according to their energy level,  X-rays, gamma rays and UV rays will have different wavelengths.

 

Hence, the correct answer is Option-2-same speed but different wavelengths.

 

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