Two metal a and b have work function 4ev and 6 ev. Which has lower threshold wavelength for photoelectric effect
Answers
Work function of metal A = 2ev
Work function of metal B= 4ev
Threshold energy is same as work function.
we know that,
hv = W +KE
hv =energy of light incident upon metal
W = work function
By given information it is clear that energy required to remove electron from metal B is more.
Energy of a light is directly proportional to frequency and inversely proportional to its wavelength.
Threshold energy of metal B is more than metal A.
Therefore threshold wavelength of Metal B is less than Metal A.
And frequency of threshold energy of metal B will be more than metal A.
At the same time if same type of light is incident upon both the metals then KE possessed by electrons of Metal B will be less than metal A.
Answer:
Work function of metal A = 2ev
Work function of metal B= 4ev
Threshold energy is same as work function.
we know that,
hv = W +KE
hv =energy of light incident upon metal
W = work function
By given information it is clear that energy required to remove electron from metal B is more.
Energy of a light is directly proportional to frequency and inversely proportional to its wavelength.
Threshold energy of metal B is more than metal A.
Therefore threshold wavelength of Metal B is less than Metal A.
And frequency of threshold energy of metal B will be more than metal A.
At the same time if same type of light is incident upon both the metals then KE possessed by electrons of Metal B will be less than metal A.