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Question: Answered & Verified by Expert
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.
PhysicsElectromagnetic WavesAIIMSAIIMS 2018 (26 May)
Options:
  • A If both assertion and reason are true and reason is the correct explanation of assertion.
  • B If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C If assertion is true but reason is false.
  • D If both assertion and reason are false.
Solution:
2106 Upvotes Verified Answer
The correct answer is: If assertion is true but reason is false.
Energy of a photon $E=\frac{h c}{\lambda}$. As $\lambda$ 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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