On an average, a human heart is found to beat 72 times in a minute. Its frequency and time period respectively are

Options

A. 1.2 Hz, 0.83 s
B. 2.5 Hz, 1.2 s
C. 2 Hz, 1.2 s
D. 2.5 Hz, 0.83 s

Explanation

To solve the problem of finding the frequency and time period 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 Beats per Minute to Beats per Second**:
- Since there are 60 seconds in a minute, we can calculate the number of beats per second (frequency) by dividing the number of beats by the number of seconds in a minute.
\[ \text{Frequency (f)} = \frac{\text{Number of beats}}{\text{Time in seconds}} = \frac{72 \text{ beats}}{60 \text{ seconds}} = 1.2 \text{ Hz} \]

3. **Calculate the Time Period**:
- The time period (T) is the reciprocal of the frequency. It tells us how long one complete cycle (or beat) takes.
\[ \text{Time Period (T)} = \frac{1}{\text{Frequency (f)}} = \frac{1}{1.2 \text{ Hz}} \approx 0.8333 \text{ seconds} \]
- Rounding this gives us approximately \( T \approx 0.83 \text{ seconds} \).

4. **Final Results**:
- Therefore, the frequency and time period of the heartbeats are:
- Frequency (f) = 1.2 Hz
- Time Period (T) = 0.83 seconds

### Summary of Results:
- Frequency = 1.2 Hz
- Time Period = 0.83 seconds