which has higher energy a photon of red light with wavelenght 7500 A or a photon of green light with wavelenght 5250 A?
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Wavelength of red light (λ) = 7500 A∘ = 7500×10−10 m
As we know :
Energy of light = hcλ
where 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
and for green light wavelength (λ) = 5250 A∘ = 5250×10−10 m
∴ 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.
As we know :
Energy of light = hcλ
where 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
and for green light wavelength (λ) = 5250 A∘ = 5250×10−10 m
∴ 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.
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Answer:
Wavelength of red light (X) = 7500 A° = 7500×10-10 m As we know: Energy of light = hcλ where 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 and for green light wavelength (X) = 5250 A° = 5250×10-10 m .. Energy = 6.626×10-34Js ×3×108m/ = 3.7863 × 10-19J s5250×10-10m Thus green light with greater wavelength has lower energy than green light.
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