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The energy required to dislodge electrons from sodium metal via the photoelectric effect is 275 kJ/mol . What wavelength of light, in nanometers, has sufficient energy per photon to dislodge an electron from the surface of sodium? Express the wavelength in nanometers to three significant figures.

2 Answers

4 votes

Answer:

435

Step-by-step explanation:

User Pimvdb
by
8.4k points
3 votes

Answer:

435 nm

Step-by-step explanation:

Given the energy required to dislodge electrons from sodium metal via the photoelectric effect is 275 kJ/mol

⇒ energy per photon =energy per mole/Avogadros number

=
(275*1000)/(6.022*10^(23))

= 4.5666 x 10^(-19) J


Wavelength=(hc)/(energy per photon)

=
(6.626*10^(-34)*3*10^8)/(4.56*10^(-19))

=
4.35*10^(-7) m

=435 nm

hence the wavelength is equal to 435 nm

User Martosfre
by
7.4k points
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