The diode shown in the circuit is a silicon diode. The potential difference between the points A and B will be
|
(a) 6 V |
(b) 0.6 V |
(c) 0.7 V |
(d) 0 V |
(a) 6 V
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For the sustained interference of light, the necessary condition is that the two sources should
|
(a) Have constant phase difference |
(b) Be narrow |
|
(c) Be close to each other |
(d) Of same amplitude |
Assuming photoemission to take place, the factor by which the maximum velocity of the emitted photoelectrons changes when the wavelength of the incident radiation is increased four times, is
|
(a) 4 |
(b) |
(c) 2 |
(d) |
A wire has a resistance of 6 W. It is cut into two parts and both half values are connected in parallel. The new resistance is ....
|
(a) 12 W |
(b) 1.5 W |
(c) 3 W |
(d) 6 W |
When wavelength of incident photon is decreased then
|
(a) Velocity of emitted photo-electron decreases |
|
(b) Velocity of emitted photoelectron increases |
|
(c) Velocity of photoelectron do not charge |
|
(d) Photo electric current increases |
An electron (charge = 1.6 × 10–19 coulomb) is moving in a circle of radius 5.1 × 10–11m at a frequency of 6.8 × 1015 revolutions/sec. The equivalent current is approximately
|
(a) 5.1 |
(b) 6.8 |
(c) 1.1 |
(d) 2.2 |
The phenomenon of radioactivity is
|
(a) Exothermic change which increases or decreases with temperature |
|
(b) Increases on applied pressure |
|
(c) Nuclear process does not depend on external factors |
|
(d) None of the above |
