An electron of mass m when accelerated through a potential difference V has de-Broglie wavelength λ. The de-Broglie wavelength associated with a proton of mass M accelerated through the same potential difference will be
|
(a) λ |
(b) λ |
(c) λ |
(d) λ |
(b) λ
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A non-planar loop of conducting wire carrying a current I is placed as shown in the figure. Each of the straight sections of the loop is of length 2a. The magnetic field due to this loop at the point P (a,0,a) points in the direction
|
(a) |
(b) |
(c) |
(d) |
The wavelength of 
X-rays produced by an X-ray tube is 0.76 Å. The atomic number of the anode material of the tube is
| (a) 20 | (b) 60 | (c) 40 | (d) 80 |
Effective resistance between A and B is
|
(a) 15 W |
(b) 5 W |
(c) |
(d) 20 W |
The characteristic X-ray radiation is emitted, when
| (a) The electrons are accelerated to a fixed energy |
| (b) The source of electrons emits a monoenergetic beam |
|
(c) The bombarding electrons knock out electrons from the inner shell of the target atoms and one of the outer electrons falls into this vacancy |
|
(d) The valence electrons in the target atoms are removed as a result of the collision |
When a point source of light is at a distance of one metre from a photo cell, the cut off voltage is found to be V. If the same source is placed at 2 m distance from photo cell, the cut off voltage will be
|
(a) V |
(b) V/2 |
(c) V/4 |
(d) V/ |
