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 solve the question of how many heartbeats occur in one minute given that the frequency of the human heart is 1.25 Hz, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Frequency**:
- Frequency (f) is defined as the number of cycles (or beats, in this case) per unit time. The unit of frequency is Hertz (Hz), where 1 Hz = 1 cycle per second.

2. **Convert Frequency to Beats per Minute**:
- Since the frequency of the heart is given as 1.25 Hz, this means the heart beats 1.25 times in one second.

3. **Calculate the Number of Beats in One Minute**:
- There are 60 seconds in one minute. To find the total number of heartbeats in one minute, we multiply the frequency by the number of seconds in a minute:
\[ \text{Number of beats in one minute} = \text{Frequency} \times \text{Time in seconds} \]
\[ \text{Number of beats in one minute} = 1.25 \, \text{Hz} \times 60 \, \text{seconds} \]

4. **Perform the Calculation**:
- Now we perform the multiplication:
\[ 1.25 \times 60 = 75 \]

5. **Conclusion**:
- Therefore, the number of heartbeats in one minute is **75 beats**.

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

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