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
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A photon of energy 8 eV is incident on a metal surface of threshold frequency 1.6 
, then the maximum kinetic energy of photoelectrons emitted is (h = 6.6 
|
(a) 4.8 eV |
(a) 4.8 eV |
(c) 1.4 eV |
(d) 0.8 eV |
A condenser of capacitance 10 μF has been charged to 100 volts. It is now connected to another uncharged condenser in parallel. The common potential becomes 40 volts. The capacitance of another condenser is
|
(a) 15 μF |
(b) 5 μF |
(c) 10 μF |
(d) 16.6 μF |
Figure represents a graph of kinetic energy (K) of photoelectrons (in eV) and frequency (v) for a metal used as cathode in photoelectric experiment. The work function of metal is
|
(a) 1 eV |
(b) 1.5 eV |
(c) 2 eV |
(d) 3 eV |
Fusion reaction is initiated with the help of
|
(a) Low temperature |
(b) High temperature |
(c) Neutrons |
(d) Any particle |
When the speed of a dc motor increases the armature current
|
(a) Increases |
|
(b) Decreases |
|
(c) Does not change |
|
(d) Increases and decreases continuously |