To obtain a p-type semiconductor, germanium must be doped with
Options
(a) Arsenic (b) Antimony (c) Indium (d) Phosphorus
Correct Answer:
Indium
Explanation:
P-type semiconductor is obtained when Si or Ge (tetravalent) is […]
What is the voltage gain in a common-emiiter amplifier, when input resistance is 4 Ω and load resistance is 24 Ω? Take β=0.6
Options
(a) 3.6 (b) 4.8 (c) 2.4 (d) 1.2
Correct Answer: […]
If h is Planck’s constant, the momentum of a photon of wavelength 0.01 Å is
Options
(a) 10⁻² h (b) h (c) 10² h (d) 10¹² h
Correct Answer:
10¹² h
Explanation:
No […]
If the velocity of an electron increases, then its de Broglie wavelength will
Options
(a) Increase (b) Decrease (c) Remain the same (d) Become twice
Correct Answer:
Decrease
Explanation:
No explanation available. Be […]
If the radioactive dacay constant of radium is 1.07 x 10⁻⁴ year⁻¹, then its half-life is approximately
Options
(a) 8900 years (b) 7000 years (c) 6477 years (d) 5000 years
Correct Answer:
6477 […]
In the Bohr’s model of hydrogen atom, the ratio of the kinetic energy to the total energy of the electron in nth quantum state is
Options
(a) (-1) (b) (+1) (c) (-2) (d) (+2)
Bohr’s postulates quantizes
Options
(a) atomic mass (b) charge (c) angular momentum (d) energy
Correct Answer:
angular momentum
Explanation:
No explanation available. Be the first to write the explanation for this question by […]
Which of the following does not increase regularly?
Options
(a) mass number (b) atomic number (c) packing fraction (d) binding energy
Correct Answer:
packing fraction
Explanation:
Mass number, atomic number and binding energy increases […]
An aeroplane is flying horizontally with a velocity of 216 km/h at a height of 1960 m. When it is vertically above a point A on the ground, a bomb is released from it. The […]
3 persons are initially at the 3 corners of an equilateral triangle whose side is equal to d. Each person now moves with a uniform speed v in such a way that the first moves […]
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