1.

4. Two laser beams one of wave length \( 640 nm \) and the other \( 400 nm \) have same unit flux of photons. Their powers are in the ratioa) \( 64: 40 \)b) \( 1: 1 \)c) \( 5: 8 \)d) \( 25: 64 \)

Answer»

For same flux energy emitted per unit area per unit time are equal  hence their power are equal. 1:1



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