The minimum wavelength of X-rays produced by electrons accelerated by a potential difference of volts is equal to
(a) 
|
(b) 
|
(c) 
|
(d) 
|
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In the circuit given E = 6.0 V, R1 = 100 ohms, R2 = R3 = 50 ohms, R4 = 75 ohms. The equivalent resistance of the circuit, in ohms, is
|
(a) 11.875 |
(b) 26.31 |
(c) 118.75 |
(d) None of these |
How much kinetic energy will be gained by an α - particle in going from a point at 70 V to another point at 50 V
|
(a) 40 eV |
(b) 40 keV |
(c) 40 MeV |
(d) 0 eV |
In Young's double slit experiment, the distance between the slits is 1 mm and that between slit and screen is 1 meter and 10th fringe is 5 mm away from the central bright fringe, then wavelength of light used will be
|
(a) 5000 Å |
(b) 6000 Å |
(c) 7000 Å |
(d) 8000 Å |
In the given figure net magnetic field at O will be
(a)  
|
(b) 
|
(c) |
(d) |
A photon of wavelength 6630 Å is incident on a totally reflecting surface. The momentum delivered by the photon is equal to
|
(a) 6.63 × 10–27 kg-m/sec |
(b) 2 × 10–27 kg-m/sec |
(c) 10–27 kg-m/sec |
(d) None of these |
