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Q.

[78]

A human heart beats 75 times a minute. What will be its frequency ?


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a

1.00 Hz times per second

b

1.25 Hz times per second

c

1.50 Hz times per second

d

1.75 Hz times per second 

answer is B.

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Detailed Solution

A human heart beats 75 times a minute. Its frequency will be 1.25 Hz times per second.
Given,
t = 1 minute = 60 seconds.
The number of times the heart beats = 75 times per minute. The frequency is given as follows:
Frequency = The number of times heart beats/Total time taken in seconds 
⇒                   =7560
Frequency   = 1.25 Hz.
Hence, the required frequency is 1.25 times per second.
  
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