Find the number of emitted per minute by a 25W source of monochromatic light of wavelength 5000Å. Use `h=6.63xx10^(-34)Js`.

Explanation

To find the number of photons emitted per minute by a 25W source of monochromatic light with a wavelength of 5000 Å, we can follow these steps:

### Step 1: Convert the wavelength from angstroms to meters
1 Å = \(10^{-10}\) m, so:
\[ \text{Wavelength} = 5000 \, \text{Å} = 5000 \times 10^{-10} \, \text{m} = 5.0 \times 10^{-7} \, \text{m} \]

...