A human heart beats 72 times in a minute. The beat frequency is

Options

A. `1.39 s^(-1)`
B. `1.2 s^(-1)`
C. `1.42 s^(-1)`
D. `1.9 s^(-1)`

Answer

To find the beat frequency of a human heart that beats 72 times in a minute, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Given Information**:
- The heart beats 72 times in one minute.

2. **Convert Minutes to Seconds**:
- Since we need to find the frequency in terms of seconds, we convert minutes to seconds.
- 1 minute = 60 seconds.

3. **Calculate the Number of Beats per Second**:
- To find the beat frequency (number of beats per second), we divide the total number of beats by the total number of seconds.
- Beat frequency \( f_b = \frac{\text{Number of beats}}{\text{Time in seconds}} \)
- Here, \( f_b = \frac{72 \text{ beats}}{60 \text{ seconds}} \).

4. **Perform the Calculation**:
- \( f_b = \frac{72}{60} = 1.2 \) beats per second.

5. **Conclusion**:
- The beat frequency of the human heart is 1.2 Hz (beats per second).

### Final Answer:
The beat frequency is 1.2 Hz.

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