Year: 2017
Topic: Dual nature of radiation and matter
Time :
1.
The photoelectric threshold wavelength of silver is \(3250 \times 10^{−10}\,m\). The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength \(2536 \times 10^{−10}\,m\) is
[Given: \(h \,=\, 4.14 \times 10^{−15}\, \text{eVs}\) and \(c \,=\, 3 \times 10^8\,ms^{−1}\)]
[Given: \(h \,=\, 4.14 \times 10^{−15}\, \text{eVs}\) and \(c \,=\, 3 \times 10^8\,ms^{−1}\)]