The work function for tungsten and sodium are 4.5 eV and 2.3 eV respectively. If the threshold wavelength λ for sodium is 
, the value of λ for tungsten is
|
(a) 5893 Å |
(b) 10683 Å |
(c) 2791 Å |
(d) 528 Å |
(c) 2791 Å
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Inside a hollow charged spherical conductor, the potential
| (a) Is constant |
| (b) Varies directly as the distance from the centre |
| (c) Varies inversely as the distance from the centre |
|
(d) Varies inversely as the square of the distance from the centre |
An electron in the n = 1 orbit of hydrogen atom is bound by 13.6 eV energy is required to ionize it is
|
(a) 13.6 eV |
(b) 6.53 eV |
(c) 5.4 eV |
(d) 1.51 eV |