What is the minimum wavelength of light which can cause electron emission from copper?
A)263 nm
B)424 nm
C)678 nm
D)1435 nm
E)2345 nm

Question

Quizplus · Accepted Answer

The minimum wavelength of light which can cause electron emission from copper can be determined using the work function of copper which is 4.7 eV. 
We can use the equation: 
Energy of photon = work function + Kinetic energy of ejected electron

Since we want to find the minimum wavelength that can cause electron emission, we assume that the kinetic energy of ejected electron is zero. 
Thus, we have: 
Energy of photon = work function = 4.7 eV

We can convert the energy to wavelength using: 
Energy of photon = hc/λ 
where h is Planck's constant and c is the speed of light.

Rearranging, we get: 
λ = hc/E

Substituting the values, we get:
λ = (6.626 x 10^-34 J-s x 3 x 10^8 m/s)/(4.7 eV x 1.6 x 10^-19 J/eV) 
λ = 263 nm

Therefore, the minimum wavelength is 263 nm, which is option A.

What Is the Minimum Wavelength of Light Which Can Cause