Solve this plz help anyone intelligent here

1.	Solve this plz help anyone intelligent here
Answer» n = 100/ 4 .969 × 10^ -19 = 2.012 × 10 ^20 .Explanation:P = 100 WATT = 100 JS -1E = HC = hc/lambda , h = 6.626 × 10 ^-34 ss , C = 3×10 ^8 m/s .Lambda = 400 mm = 400 × 10 ^ 9 m E = 6.626 × 10 ^ -34 × 10 ^ 2 / ( 400 × 10 ^-9 ) = 4 . 969 × 10 ^ -19 J n × E = P n × 4. 969 × 10 ^ -19 = 100 n = 100/ 4.969 × 10 ^19 = 2.012 × 10 ^ 20.

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