Question

Help ....... .... ..... ..... ..

Answer 1

heya @ User

Energy = (h * C ) / waveLength

h = Plank's constant

C = Velocity of light

To compare energy of two radiation,

$\frac{e1}{e2} = \frac{x2}{x1}$

x2 = 400 pm = 400* 10^-12 = 4*10^-10
x1 = 800 pm = 8 * 10^-10

so, e1/ e2 = 4/8. =1/2

1/2 is your answer

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Hope it helps ya out ^_^