Light waves producing interference have their amplitudes in the ratio 3 : 2. The intensity ratio of maximum and minimum of interference fringes is
|
(a) 36 : 1 |
(b) 9 : 4 |
(c) 25 : 1 |
(d) 6 : 4 |
(c) 25 : 1
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If a power of 100 W is being supplied across a potential difference of 200 V, current flowing is
|
(a) 2 A |
(b) 0.5 A |
(c) 1 A |
(d) 20 A |
Point charge 
and 
are kept at points x = 0 and x = 6 respectively. Electrical potential will be zero at points
|
(a) x = 2 and x = 9 |
(b) x = 1 and x = 5 |
(c) x = 4 and x = 12 |
(d) x = -2 and x = 2 |
The potential barrier, in the depletion layer, is due to
|
(a) Ions |
(b) Holes |
(c) Electrons |
(d) Both (b) and (c) |
When a beam of accelerated electrons hits a target, a continuous X-ray spectrum is emitted from the target. Which of the following wavelength is absent in the X-ray spectrum, if the X-ray tube is operating at 40,000 volts
| (a) 0.25 Å | (b) 0.5 Å | (c) 1.5 Å | (d) 1.0 Å |
A thick plane mirror shows a number of images of the filament of an electric bulb. Of these, the brightest image is the
| (a) First | (b) Second | (c) Fourth | (d) Last |