Given: The bulb's power is \( 60 \, \text{W} \) and its operation time is \( 2 \, \text{hours} \).
Step 1: Convert time to seconds
As \( 1 \, \text{hour} = 3600 \, \text{seconds} \), the total time is:
\[
t = 2 \times 3600 = 7200 \, \text{seconds}
\]
Step 2: Formula for energy
Energy is calculated using the formula:
\[
E = P \times t
\]
where:
- \( P \) represents power in watts.
- \( t \) represents time in seconds.
Step 3: Substitute the values
Substitute the provided values into the formula:
\[
E = 60 \times 7200 = 432000 \, \text{J} = 4320 \, \text{kJ}
\]
Answer: The correct answer is option (4): 4320 J.