In insulators (CB is Conduction Band and VB is Valence Band)
In insulators (CB is Conduction Band and VB is Valence Band)
Options
(a) VB is partially filled with electrons (b) CB is partially filled with electrons (c) CB is empty and VB is […]
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Light of wavelength λᴀ and λᴃ falls on two identical metal plates A and B respectively.
Light of wavelength λᴀ and λʙ falls on two identical metal plates A and B respectively. The maximum kinetic energy of photoelectrons is Kᴀ and Kʙ respectively, then which one of the following reletions is […]
An electron in potentiometer experiences a force 2.4×10⁻¹⁹N. The length of potentiometer
An electron in potentiometer experiences a force 2.4×10⁻¹⁹N. The length of potentiometer wire is 6m. The emf of the battery connected across the wire is (electronic charge=1.6×10⁻¹⁹C)
Options
(a) 6V (b) 9V (c) […]
In Wheatstone bridge, three resistors P,Q and R are conncected in three arms
In Wheatstone bridge, three resistors P,Q and R are conncected in three arms in order and 4th arm of resistance s, is formed by two resistors s₁ and s₂ connected in parallel. The condition for […]
If, an electron in hydrogen atom jumps from an orbit of level n=3 to an orbit
If, an electron in hydrogen atom jumps from an orbit of level n=3 to an orbit of level n=2, emitted radiation has a frequency (R=Rydberg’s constant, c=velocity of light)
Options
(a) 3Rϲ/27 (b) […]
In L-C-R series circuit, an alternating emf e and current i are given by the equations
In L-C-R series circuit, an alternating emf e and current i are given by the equations e=100 sin (100t) V. i=100 sin(100t+π/3)mA . The average power dissipated in the circuit will be
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A fringe width of a certain interference pattern is β=0.002 cm. What is the distance
A fringe width of a certain interference pattern is β=0.002 cm. What is the distance of 5th dark fringe centre?
Options
(a) 1×10⁻² cm (b) 11×10⁻² cm (c) 1.1×10⁻² cm (d) 3.28×10⁶ cm
The de-broglie wavelength of an electron in 4th orbit is
The de-broglie wavelength of an electron in 4th orbit is ( where, r= radius of 1st orbit)
Options
(a) 2πr (b) 4πr (c) 8πr (d) 16πr
Correct Answer:
8πr
Explanation:
No explanation available. […]
Two coherent sources of intensity ratio α interfere. In interference pattern,
Two coherent sources of intensity ratio α interfere. In interference pattern, Imax – Imin/ Imax+ Imin is equal to
Options
(a) 2α/1+α (b) 2√α/1+α (c) 2α/1+√α (d) 1+α/2α
Correct Answer:
2√α/1+α
Explanation:
No […]
In electromagnetic wave, according to Maxwell, changing electric field gives
In electromagnetic wave, according to Maxwell, changing electric field gives
Options
(a) stationary magnetic field (b) conduction current (c) eddy current (d) displacement current
Correct Answer:
displacement current
Explanation:
No explanation available. Be […]