What is the energy of a photon with a wavelength of 260 nm.

1.	What is the energy of a photon with a wavelength of 260 nm.
Answer» Answer: 460.458KJ/MOL Explanation: The energy of a photon = hv=hc/ f given wavelength = 260nm changing nm to m becomes 260 x 10^-9m remembering that frequency = speed of light(C)/ f wavelength = 3 x10^8 / 260 x10^-9 = 1.15 x 10^15 s-1 frequency (V) = 1.15 x 10^15 s-1 Energy = hv where h is planks CONSTANT = 6.626 X 10^-34 J-s v is frequency = 1.1538 x 10^15s-1 E= 6.626X 10^-34 J-s X 1.15 x 10^15s-1 =7.645X 10^-19 joules But I mole = 6.023 X10^23 therefore Energy = 7.645X 10^-19 x 6.023 X 10^23 =460,458.35Joules / mole 460,458.35Joules / mole To kilojoules/ mol = 460,458.35Joules / mole/1000= 460.458KJ/mol

Answer»

Answer:

460.458KJ/MOL

Explanation:

The energy of a photon = hv=hc/ f

given wavelength = 260nm

changing nm to m becomes 260 x 10^-9m

remembering that frequency = speed of light(C)/ f wavelength

= 3 x10^8 / 260 x10^-9 = 1.15 x 10^15 s-1

frequency (V) = 1.15 x 10^15 s-1

Energy = hv

where h is planks CONSTANT = 6.626 X 10^-34 J-s

v is frequency = 1.1538 x 10^15s-1

E= 6.626X 10^-34 J-s X 1.15 x 10^15s-1

=7.645X 10^-19 joules

But I mole = 6.023 X10^23

therefore Energy = 7.645X 10^-19 x 6.023

X 10^23 =460,458.35Joules / mole

460,458.35Joules / mole To kilojoules/ mol = 460,458.35Joules / mole/1000= 460.458KJ/mol

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