If the frequency of human heart is 1.25 Hz, the number of heart beats in 1 minutes is

Options

A. 65
B. 75
C. 80
D. 90

Explanation

To find the number of heartbeats in one minute given the frequency of the human heart, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Frequency**: The frequency of the human heart is given as 1.25 Hz. This means the heart beats 1.25 times per second.

2. **Convert Frequency to Heartbeats per Minute**: To find the number of heartbeats in one minute, we need to multiply the frequency (in beats per second) by the number of seconds in one minute. There are 60 seconds in one minute.

\[ \text{Number of heartbeats in 1 minute} = \text{Frequency} \times \text{Time in seconds} \]

\[ \text{Number of heartbeats in 1 minute} = 1.25 \, \text{beats/second} \times 60 \, \text{seconds} \]

3. **Calculate the Total Heartbeats**:

\[ \text{Number of heartbeats in 1 minute} = 1.25 \times 60 = 75 \, \text{beats} \]

4. **Conclusion**: The number of heartbeats in one minute is 75.

### Final Answer:
The number of heartbeats in one minute is **75 beats**.

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