A thunder tap is heard 5.5 s after the lightening flash. The distance of the flash is (velocity of sound in air is 330 m/s) :-

Options

A. 3560 m
B. 300 m
C. 1780 m
D. 1815 m

Explanation

To solve the problem of determining the distance of the lightning flash based on the time delay in hearing the thunder, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Given Values**:
- Velocity of sound in air, \( v = 330 \, \text{m/s} \)
- Time delay, \( t = 5.5 \, \text{s} \)

2. **Use the Formula for Distance**:
The formula to calculate distance when velocity and time are known is:
\[ d = v \times t \]

3. **Substitute the Known Values**:
Plugging in the values we have:
\[ d = 330 \, \text{m/s} \times 5.5 \, \text{s} \]

4. **Calculate the Distance**:
To perform the multiplication:
\[ d = 330 \times 5.5 \]
We can break this down:
\[ d = 330 \times \frac{55}{10} = \frac{330 \times 55}{10} \]

5. **Perform the Multiplication**:
First, calculate \( 330 \times 55 \):
\[ 330 \times 55 = 18150 \]
Now, divide by 10:
\[ d = \frac{18150}{10} = 1815 \, \text{m} \]

6. **Final Result**:
Therefore, the distance of the flash is:
\[ d = 1815 \, \text{m} \]

### Conclusion:
The distance of the lightning flash is **1815 meters**.