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For intensity I of a light of wavelength 5000Å the photoelectron saturation current is 0.40 μA and stopping potential is 1.36 V, the work function of metal is
|
(a) 2.47 eV |
(b) 1.36 eV |
(c) 1.10 eV |
(d) 0.43 eV |
A radio transmitter operates at a frequency of 880 kHz and a power of 10 kW. The number of photons emitted per second are
|
(a) 1.72 |
(b) 1327 |
(c) 13.27 |
(d) 0.075 |
If A and B are two inputs in AND gate, then AND gate has an output of 1 when the values of A and B are
|
(a) A = 0, B = 0 |
(b) A = 1, B = 1 |
(c) A = 1, B = 0 |
(d) A = 0, B = 1 |
In an experiment on photoelectric effect the frequency f of the incident light is plotted against the stopping potential 
. The work function of the photoelectric surface is given by (e is electronic charge)
|
(a) OB × e in eV |
(b) OB in volt |
|
(c) OA in eV |
(d) The slope of the line AB |
The magnetic needle of a tangent galvanometer is deflected at an angle 30o due to a magnet. The horizontal component of earth’s magnetic field 0.34 × 10–4 T is along the plane of the coil. The magnetic intensity is
|
(a) 1.96 × 10–4 T |
(b) 1.96 × 10–5 T |
(c) 1.96 × 104 T |
(d) 1.96 × 105 T |
10 gm of radioactive material of half-life 15 year is kept in store for 20 years. The disintegrated material is
|
(a) 12.5 g |
(b) 10.5 g |
(c) 6.03 g |
(d) 4.03 g |
The ratio of momenta of an electron and an α- particle which are accelerated from rest by a potential difference of 100 V is
|
(a) 1 |
(b) |
(c) |
(d) |
