Doppler's effect in sound in addition to relative velocity between source and observer, also depends while source and observer or both are moving. Doppler effect in light depend only on the relative velocity of source and observer. The reason of this is
|
(a) Einstein mass - energy relation |
(b) Einstein theory of relativity |
|
(c) Photoelectric effect |
(d) None of these |
(b) Einstein theory of relativity
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The velocity of light in a medium is half its velocity in air. If ray of light emerges from such a medium into air, the angle of incidence, at which it will be totally internally reflected, is
|
(a) 15o |
(b) 30 o |
(c) 45 o |
(d) 60 o |
In the following common emitter configuration an NPN transistor with current gain b = 100 is used. The output voltage of the amplifier will be
|
(a) 10 mV |
(b) 0.1 V |
(c) 1.0 V |
(d) 10 V |
Two electric bulbs whose resistances are in the ratio of 1 : 2 are connected in parallel to a constant voltage source. The powers dissipated in them have the ratio
|
(a) 1 : 2 |
(b) 1 : 1 |
(c) 2 : 1 |
(d) 1 : 4 |
In Young's double slit experiment, 62 fringes are seen in visible region for sodium light of wavelength 5893 Å. If violet light of wavelength 4358 Å is used in place of sodium light, then number of fringes seen will be
|
(a) 54 |
(b) 64 |
(c) 74 |
(d) 84 |
A solenoid has an inductance of 60 henrys and a resistance of 30 ohms. If it is connected to a 100 volt battery, how long will it take for the current to reach 
of its final value
|
(a) 1 second |
(b) 2 seconds |
(c) e seconds |
(d) 2e seconds |
In the graph given below. If the slope is 4.12 
V-sec, then value of ‘h’ should be
|
(a) 6.6 |
(b) 6.6 |
(c) 9.1 |
(d) None of these |
A radioactive nucleus undergoes a-emission to form a stable element. What will be the recoil velocity of the daughter nucleus if V is the velocity of a-emission and A is the atomic mass of radioactive nucleus
|
(a) |
(b) |
(c) |
(d) |
