If two light waves having same frequency have intensity ratio 4 : 1 and they interfere, the ratio of maximum to minimum intensity in the pattern will be
|
(a) 9 : 1 |
(b) 3 : 1 |
(c) 25 : 9 |
(d) 16 : 25 |
(a) 9 : 1
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In a potentiometer circuit there is a cell of e.m.f. 2 volt, a resistance of 5 ohm and a wire of uniform thickness of length 1000 cm and resistance 15 ohm. The potential gradient in the wire is
|
(a) |
(b) |
(c) |
(d) |
The maximum peak to peak voltage of an AM wire is 24 mV and the minimum peak to peak voltage is 8 mV. The modulation factor is
|
(a) 10% |
(b) 20% |
(c) 25% |
(d) 50% |
If the following input signal is sent through a PN-junction diode, then the output signal across RL will be
(a)
|
(b)
|
(c)
|
(d)
|
A man runs towards a mirror at a speed 15 m/s The speed of the image relative to the man is
|
(a) 15 |
(b) 30 |
(c) 35 |
(d) 20 |
A ray of light is incident at the glass–water interface at an angle i, it emerges finally parallel to the surface of water, then the value of 
would be
|
(a) (4/3) sin i |
(b) 1/sin i |
(c) 4/3 |
(d) 1 |
