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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 |
In a transformer the primary has 500 turns and secondary has 50 turns. 100 volts are applied to the primary coil, the voltage developed in the secondary will be
|
(a) 1 V |
(b) 10 V |
(c) 1000 V |
(d) 10000 V |
When two magnetic moments are compared using equal distance method the deflections produced are 45o and 30o. If the length of magnets are in the ratio 1 : 2, the ratio of their pole strengths is
|
(a) 3 : 1 |
(b) 3 : 2 |
(c) |
(d) 2 |
In the following arrangement y = 1.0 mm, d = 0.24 mm and D = 1.2 m. The work function of the material of the emitter is 2.2 eV. The stopping potential V needed to stop the photo current will be
|
(a) 0.9 V |
(b) 0.5 V |
(c) 0.4 V |
(d) 0.1 V |
A coil of 100 turns carries a current of 5 mA and creates a magnetic flux of 10–5 weber. the inductance is
|
(a) 0.2 mH |
(b) 2.0 mH |
(c) 0.02 mH |
(d) None of these |
The energy that should be added to an electron to reduce its de Broglie wavelength from one nm to 0.5 nm is
|
(a) Four times the initial energy |
(b) Equal to the initial energy |
|
(c) Twice the initial energy |
(d) Thrice the initial energy |
Dispersive power depends upon
|
(a) The shape of prism |
(b) Material of prism |
|
(c) Angle of prism |
(d) Height of the prism |
