Question

a lev
b) 3.25 eV
c) 4 eV
27. Which metal will be suitable for a photoelectric cell using light of wavelength 4000 Å? The work
d) 9.25 eV
functions of sodium and copper are respectively 2.0 eV and 4.0 eV.
a) Sodium
b) Copper
c) Both
d) None of these
28. The ratio of areas het​

Answer 1

Answer:

it's answers is c. both