Energy of photon whose frequency is
, will be
|
(a) 4.14 |
(b) 4.14 |
(c) 4.14 |
(d) 4.14 |
Energy of photon whose frequency is
, will be
|
(a) 4.14 |
(b) 4.14 |
(c) 4.14 |
(d) 4.14 |
(d) 4.14
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A combination of two thin convex lenses of focal length 0.3 m and 0.1 m will have minimum spherical and chromatic aberrations if the distance between them is
|
(a) 0.1 m |
(b) 0.2 m |
(c) 0.3 m |
(d) 0.4 m |
Two coherent sources of intensity ratio 1 : 4 produce an interference pattern. The fringe visibility will be
|
(a) 1 |
(b) 0.8 |
(c) 0.4 |
(d) 0.6 |
The radius of the first (lowest) orbit of the hydrogen atom is
The radius of the second (next higher) orbit will be
|
(a) 4 |
(b) 6 |
(c) 8 |
(d) 10 |
Energy released in the fission of a single
nucleus is 200 MeV. The fission rate of a
fuelled reactor operating at a power level of 5W is
|
(a) 1.56 |
(b) 1.56 |
(c) 1.56 |
(d) 1.56 |
A plane convex lens is made of refractive index 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is
|
(a) 50 cm |
(b) 100 cm |
(c) 200 cm |
(d) 400 cm |
To deposit one gm equivalent of an element at an electrode, the quantity of electricity needed is
|
(a) One ampere |
(b) 96000 amperes |
(c) 96500 farads |
(d) 96500 coulombs |
Ultraviolet light of wavelength 300 nm and intensity 1.0 watt/m2 falls on the surface of a photosensitive material. If 1% of the incident photons produce photoelectrons, then the number of photoelectrons emitted from an area of 1.0 cm2 of the surface is nearly
|
(a) 9.61 |
(b) 4.12 |
|
(c) 1.51 |
(d) 2.13 |
The combination of ‘NAND’ gates shown here under (figure) are equivalent to
|
(a) An OR gate and an AND gate respectively |
|
(b) An AND gate and a NOT gate respectively |
|
(c) An AND gate and an OR gate respectively |
|
(d) An OR gate and a NOT gate respectively. |
The Bohr radius of the fifth electron of phosphorus (atomic number = 15) acting as dopant in silicon (relative dielectric constant = 12) is
|
(a) 10.6 Å |
(b) 0.53 Å |
(c) 21.2 Å |
(d) None of these |