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Q.

Slope of the line when wavelength (λ m) on y-axis is plotted against 1E(J-1) on x-axis for an electromagnetic radiation is 198.75 x 10-25J m. Number of photons present in the electromagnetic radiation is

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a

100

b

1000

c

10

d

10000

answer is B.

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Detailed Solution

E =nhcλ

λ=nhc×1E 

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Slope = nhc = 198.75 x 10-25J m

n=198.75×10-25J m6.625×10-34Js×3×108ms-1=100

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