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Grade: 11
        
the red line in the spectrum of the lithium occurs at 670.8nm. what is the energy of this light? what is the energy of 1 mole of these quanta?
 
3 months ago

Answers : (1)

Arun
22545 Points
							
Frequency (ν)
Wavelength (λ)
Energy (E)
First, solve for frequency (ν)
ν= c/λ   (where c is 3x10⁸ m/s)
  = 3x10⁸ m/s / (670.8nm* 1m/ 1x10⁹nm) -> (convert nm to meter because c is in meter/second)
ν= 4.47x10¹⁴
And then, find the Energy (E)
E= hv (where h is the Planck's constant= 6.63x10⁻³⁴ J·s)
E= 6.63x10⁻³⁴ * 4.47x10¹⁴
E= 2.96x10⁻¹⁹
 
3 months ago
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