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NEET2018PhysicsElectromagnetic WavesActual

Assertion : The energy of X-ray photon is greater than that of light (visible) photon. Reason : X-ray photon in vacuum travels faster than light photon.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false.

Step-by-step solution

Energy of a photon E= h c . As for X-ray is smaller than light, so energy of X-rays is greater than that of light. Therefore, assertion is true. Here, reason is false as X-rays and light travel with same speed in vacuum.

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