Question

Which has a higher energy: a photon of red
light with a wavelength of 7500 A° or a photon
of green light with a wavelength of 5250 Aº ?​

Answer 1

Answer:

which has higher energy a photon of red light with wavelenght 7500 A or a photon of green light with wavelenght 5250 A? Thus red light with greater wavelength has lower energy than green light.

Answer 2

Answer:

Explanation:

Wavelength of  red light (λ)(λ) = 7500 A∘A∘ = 7500×10−10 m7500×10-10 m

As we know :

Energy of light = hcλhcλ

where h (planck's constant) = 6.626×10−34Jsand c (speed of light) = 3×108m/swhere h (planck's constant) = 6.626×10-34Jsand c (speed of light) = 3×108m/s

∴ Energy = 6.626×10−34Js ×3×108m/s7500×10−10m                = 2.6504 × 10−19J∴ Energy = 6.626×10-34Js ×3×108m/s7500×10-10m                = 2.6504 × 10-19J

and for green light wavelength (λ)(λ) = 5250 A∘A∘ = 5250×10−10 m5250×10-10 m

 

∴ Energy = 6.626×10−34Js ×3×108m/s5250×10−10m                = 3.7863 × 10−19J∴ Energy = 6.626×10-34Js ×3×108m/s5250×10-10m                = 3.7863 × 10-19J

Thus red light  with greater wavelength has lower energy than green light.