please solve the above question whose answer is 3.2×10^-19
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Work function = 4.2ev = 4.2×1.6×10^-19j
=6.72 ×10^-19 j
wavelength =2000Å = 2000×10^-10m
Energy associated with this wavelength
= hc/ wavelength =
6.6×10^-34 js×3×10^8m/s/2×10^-7m
=9.9 × 10^-19j
Kinetic energy = Energy - work function
= 9.9×10^-19 -6.72×10^-19
=3.18 ×10^-19 j
=6.72 ×10^-19 j
wavelength =2000Å = 2000×10^-10m
Energy associated with this wavelength
= hc/ wavelength =
6.6×10^-34 js×3×10^8m/s/2×10^-7m
=9.9 × 10^-19j
Kinetic energy = Energy - work function
= 9.9×10^-19 -6.72×10^-19
=3.18 ×10^-19 j
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