Which of the following is true for photon
|
(a) E = |
(b) E = |
(c) p = |
(d) E = |
Which of the following is true for photon
|
(a) E = |
(b) E = |
(c) p = |
(d) E = |
(a) E =
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Assertion : Microwave propagation is better than the sky wave propagation.
Reason : Microwaves have frequencies 100 to 300 GHz, which have very good directional properties.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
A radioactive substance has a half life of 60 minutes. After 3 hours, the fraction of atom that have decayed would be
|
(a)12.5% |
(b) 87.5% |
(c) 8.5% |
(d) 25.1% |
The essential distinction between X-rays and γ - rays is that
| (a) γ- rays have smaller wavelength than X-rays |
|
(b) γ - rays emanate from nucleus while X-rays emanate from outer part of the atom |
| (c) γ- rays have greater ionizing power than X-rays |
| (d) γ- rays are more penetrating than X-rays |
An ammeter of 5 ohm resistance can read 5 mA. If it is to be used to read 100 volts, how much resistance is to be connected in series
|
(a) 19.9995 Ω |
(b) 199.995 Ω |
(c) 1999.95 Ω |
(d) 19995 Ω |
The binding energy per nucleon of
is 7.97 MeV and that of
is 7.75 MeV. The energy (in MeV) required to remove a neutron from
is
|
(a) 3.52 |
(b) 3.64 |
(c) 4.23 |
(d) 7.86 |
A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of incident beam. At the first maximum of the diffraction pattern the phase difference between the rays coming from the edges of the slit is
|
(a) 0 |
(b) |
(c) |
(d) 2 |
A tank is filled with benzene to a height of 120 mm. The apparent depth of a needle lying at a bottom of the tank is measured by a microscope to be 80 mm. The refractive index of benzene is
|
(a) 1.5 |
(b) 2.5 |
(c) 3.5 |
(d) 4.5 |