Question

when an unknown wavelength of light was shined on a metallic surface, the electron is ejected with a velocity of
$1.0 \times 10 {}^6ms {}^ - 1$
If the threshold energy (work function) of the electron is
$2.8575 \times 10 {}^ - 18 \: joules$
the wavelength of light in nm is :
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Answer 1

when an unknown wavelength of light was shined on a metallic surface, the electron is ejected with a velocity of

1.0 \times 10 {}^6ms {}^ - 11.0×106ms−1

If the threshold energy (work function) of the electron is

2.8575 \times 10 {}^ - 18 \: joules2.8575×10−18joules

the wavelength of light in nm is :