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NEET2003PhysicsWaves and SoundActual

Assertion : When a beetle moves along the sand within a few tens of centimeters of a sand scorpion, the scorpion immediately turns towards the beetle and dashes towards it. Reason : When a beetle disturbs the sand, it sends pulses along the sand's surface. One set of pulses is longitudinal while the other set is transverse.

Options

  1. Aif both assertion and reason are true and the reason is the correct explanation of the assertion
  2. Bif both assertion and reason are true and the reason is not the correct explanation of the assertion
  3. Cif assertion is true but reason is false
  4. Dif both assertion and reason are false statements.

Correct answer

A. if both assertion and reason are true and the reason is the correct explanation of the assertion

Step-by-step solution

A beetle's motion sends fast longitudinal and slower transverse waves along the sand's surface. The sand scorpion intercepts the longitudinal waves first and learns the direction of the beetle by noting which one of the eight legs of the scorpion is disturbed first by the pulses. Then the scorpion dashes towards the beetle to catch it.

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