Calculate the number of photons emitted in 10 h by a 60 W sodium lamp `(lamda=5893A)`.

Explanation

To solve the problem of calculating the number of photons emitted by a 60 W sodium lamp in 10 hours, we will follow these steps:

### Step 1: Convert Time from Hours to Seconds
We need to convert the time given in hours to seconds, as power is typically expressed in watts (joules per second).

\[ \text{Time} = 10 \text{ hours} = 10 \times 60 \text{ minutes/hour} \times 60 \text{ seconds/minute} = 36000 \text{ seconds} \]
...