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Q. 33

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 30

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Short Answer

Motor neurons in mammals transmit signals from the brain to skeletal muscles at approximately 25 m/s. Estimate how long in ms it takes a signal to get from your brain to your hand.

The time required for a signal to reach from the brain to the hand is 32 ms.

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Step by Step Solution

Given information

The speed of signals from the brain to skeletal muscles is v=25 ms.

Time required for a signal to reach from brain to hand.

Suppose the distance between your brain and your hand is 0.8 m.

The average speed is given by v=xt.

Substitute the known values.

role="math" localid="1648567732955" 25 ms=0.8 mtt=0.032 =32×10-3s=32 ms

Therefore, the time required for a signal to reach from the brain to the hand is 32 ms.

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