calculate and compare the energies of two radiations ,one with a wavel

1.	calculate and compare the energies of two radiations ,one with a wavelength 400nm and other with 800nm
Answer» Calculation: E = hν h = Planck’s constant = 6.626 x 10(-34) J s ν = frequency λ = Wavelength = 400 nm C = Speed of LIGHT = 3 x 10(8) m/s ν = C / λ Substitute in the EQUATION, E = 6.626 x 10(-34) J s x 3 x 10(8) m/s / 400 x 10(-9) m E = 5 x 10(-19) J When λ = Wavelength = 800 nm E = 6.626 x 10(-34) J s x 3 x 10(8) m/s / 800 x 10(-9) m E = 2.5 x 10(-19) J Comparison: Since wavelength is inversely proportional to energy, the radiation with 400 nm has higher energy than the radiation with 800 nm.

calculate and compare the energies of two radiations ,one with a wavelength 400nm and other with 800nm

Answer»

Calculation:

E = hν

h = Planck’s constant = 6.626 x 10(-34) J s

ν = frequency

λ = Wavelength = 400 nm

C = Speed of LIGHT = 3 x 10(8) m/s

ν = C / λ

Substitute in the EQUATION,

E = 6.626 x 10(-34) J s x 3 x 10(8) m/s / 400 x 10(-9) m

E = 5 x 10(-19) J

When λ = Wavelength = 800 nm

E = 6.626 x 10(-34) J s x 3 x 10(8) m/s / 800 x 10(-9) m

E = 2.5 x 10(-19) J

Comparison:

Since wavelength is inversely proportional to energy, the radiation with 400 nm has higher energy than the radiation with 800 nm.