The work function of a metallic surface is 5.01 eV. The photo-electrons are emitted when light of wavelength 2000Å falls on it. The potential difference applied to stop the fastest photo-electrons is [h = 4.14 
|
(a) 1.2 volts |
(b) 2.24 volts |
(c) 3.6 volts |
(d) 4.8 volts |
(a) 1.2 volts
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In the Young’s double slit experiment with sodium light. The slits are 0.589 m a part. The angular separation of the third maximum from the central maximum will be (given 𝜆 = 589 mm)
|
(a) |
(b) |
(c) |
(d) |
Which of the following gates will have an output of 1
|
(a)
(a)
|
(b)
|
(c)
|
(d)
|
The phenomenon of change in the _____of light when it passes from one transparent medium to another is refraction.
Two radioactive materials 
and 
have decay constants 10λ and λ respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of to that of will be 1/e after a time
|
(a) 1/(10 λ) |
(b) 1/(11 λ) |
(c) 11(10 λ) |
(d) 1(9 λ) |
The mutual inductance between a primary and secondary circuits is 0.5 H. The resistances of the primary and the secondary circuits are 20 ohms and 5 ohms respectively. To generate a current of 0.4 A in the secondary, current in the primary must be changed at the rate of
|
(a) 4.0 A/s |
(b) 16.0 A/s |
(c) 1.6 A/s |
(d) 8.0 A/s |
A galvanometer, having a resistance of 50 W gives a full scale deflection for a current of 0.05 A. The length in meter of a resistance wire of area of cross-section 2.97 X 10–2 cm2 that can be used to convert the galvanometer into an ammeter which can read a maximum of 5 A current is (Specific resistance of the wire = 5 
Wm)
|
(a) 9 |
(b) 6 |
(c) 3 |
(d) 1.5 |
