The most important characteristic of electron in the production of X-rays is
Options
(a) Revolution of electron around the nucleus (b) Speed of electron(Striking the target) (c) Charge of electron(Striking the target) (d) […]
The velocity of radio-waves is 3×10⁵ km/s. The frequency corresponding to wavelength of 300 m is
Options
(a) 1 MHz (b) 10 MHz (c) 1 kHz (d) 10 kHz
Correct Answer:
1 MHz
Explanation: […]
Light of frequency 8×10¹⁵ Hz is incident on a substance of photoelectric work function 6.125 eV. The maximum kinetic energy of the emitted photoelectron is
Options
(a) 27 eV (b) 22 eV (c) […]
Current flows in semi-conductors through
Options
(a) Protons (b) Electrons (c) Holes (d) Holes and electrons
Correct Answer:
Holes and electrons
Explanation:
No explanation available. Be the first to write the explanation for […]
Ohm’s law is not applicable except to
Options
(a) Insulator (b) Semi-conductors (c) Arc lamp (d) All of these
Correct Answer:
All of these
Explanation:
No explanation available. Be the first to write […]
Moderator used in nuclear reactor is
Options
(a) Ice (b) Boron rods (c) Cadmium rods (d) Heavy water
Correct Answer:
Heavy water
Explanation:
No explanation available. Be the first to write the explanation […]
Wb/m² is equal to
Options
(a) henry (b) watt (c) tesla (d) dyne
Correct Answer:
tesla
Explanation:
No explanation available. Be the first to write the explanation for this question by commenting […]
Rutherford’s ∝ particle experiment showed that the atoms have
Options
(a) proton (b) nucleus (c) neutron (d) electron
Correct Answer:
nucleus
Explanation:
No explanation available. Be the first to write the explanation for […]
When a radioactive substance emits an ∝ particle, its position in the periodic table is lowered by
Options
(a) one place (b) two places (c) three places (d) four places
Correct Answer:
two […]
A particle is moving with a uniform velocity along a straight line path. A force is not required to
Options
(a) increase its speed (b) decrease the momemtum (c) change the direction (d) […]
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