Question

How much energy does a 185 nm wave of light have? (The speed of light in a

vacuum is 3.00 x 108 m/s, and Planck's constant is 6.626 x 10-34 Jos.)
A. 1.07 x 10-18 J
B. 8.38 x 1034j
C. 9.31 x 1017 J
D. 3.68 x 10-32 J
O

Answer 1

Answer: A. 1.07 x 10∧ -18 J

Step-by-step explanation:

The energy can be calculated by using this relation; E = hc / ∧

Where E = energy

h = Planck's constant = 6.626 x 10-34joules

c = speed of light = 3.00 x 10∧8 m/s

∧ = wavelenght = 185 nm = 185 x 10∧ -9m

Therefore; E= hc / ∧

= (6.626 x 10-34 j/s) x ( 3.00 x 10∧8 m/s) / 185 x 10∧ -9m

= 1.987 x 10 ∧ -25 / 185 x 10∧ -9m

= 1.07 x 10∧ -18 J