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Question: Answered & Verified by Expert
Assertion : The flash of lightening is seen before the sound of thunder is heard.
Reason : Speed of sound is greater than speed of light.
PhysicsWaves and SoundAIIMSAIIMS 2002
Options:
  • A If both the assertion and reason are true and reason is a correct explanation of the assertion.
  • B If both assertion and reason are true but assertion is not a correct explanation of the assertion.
  • C If the assertion is true but the reason is false.
  • D If both assertion and reason are false.
Solution:
1335 Upvotes Verified Answer
The correct answer is: If the assertion is true but the reason is false.
The speed of sound is $340 \mathrm{~m} / \mathrm{s}$ and speed of light is $3 \times 10^8 \mathrm{~m} / \mathrm{s}$ in air. Thus flash of lightening is seen before the sound of thunder is heard.

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