A source emits 12.0 J of lightof wavelength 620 nm and 8.0 J of light of wavelength 580 nm per second. The relative luminosilty at 620 is 25% and that at 580 nm is 80%. Find a the total radiant flux, b. the total luminous flux and c. and luminous efficiency.

Explanation

To solve the problem step by step, we will break down each part of the question systematically.

### Given Data:
- Energy emitted at 620 nm: \( E_1 = 12.0 \, \text{J/s} \)
- Energy emitted at 580 nm: \( E_2 = 8.0 \, \text{J/s} \)
- Relative luminosity at 620 nm: \( R_1 = 25\% = 0.25 \)
- Relative luminosity at 580 nm: \( R_2 = 80\% = 0.80 \)

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