It is observed that a child's heart rate is 135 times per minute. The beat frequency of heart is ____.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 2.25 Hz.
A child's heart rate of 135 beats per minute (bpm) corresponds to a beat frequency of 2.25 Hz. Frequency is calculated as the number of occurrences per second. To convert bpm to Hz, divide by 60 (since 1 minute = 60 seconds):
135 ÷ 60 = 2.25 Hz.
This means the child’s heart beats 2.25 times every second. In physics and biology, Hertz (Hz) is the unit used to measure frequency, representing cycles per second. A higher heart rate is normal in children due to faster metabolism and developmental needs. This frequency is within a healthy range for children.