Light is emitted when
Light is emitted when
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(a) Electron make an transition from higher orbit to lower orbit (b) Electron make an transition from lower to higher orbit (c) Electron rotates in its own orbit […]
BHU2007
For a diatomic gas charge in internal energy for unit charge in temperature for
For a diatomic gas charge in internal energy for unit charge in temperature for constant pressure and constant volume is U₁ and U₂ respectively. U₁ : U₂ is
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(a) (5:3) (b) (3:5) […]
A uniform chain of length L and mass m is kept on a smooth table. It is released
A uniform chain of length L and mass m is kept on a smooth table. It is released from rest when the overhanging part was nᵗʰ fraction of total length. Find the kinetic energy of […]
A body covers 200 cm in the first 2 seconds and 220 cm in the next 4 seconds.
A body covers 200 cm in the first 2 seconds and 220 cm in the next 4 seconds. The velocity of the body at the end of the 7th second is
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(a) 10 […]
A neutron is moving with a velocity u.It collides head on and elastically with an atom
A neutron is moving with a velocity u.It collides head on and elastically with an atom of mass number A. If the initial kinetic energy of the neutron be E. How much kinetic energy will […]
Electrons with energy 80 keV are incident on the tungsten target of an X-ray tube.
Electrons with energy 80 keV are incident on the tungsten target of an X-ray tube. The K-shell electrons of tungsten have -72.5 keV energy. The X-rays emitted by the tube contains only
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The respective speeds of the molecules are 1,2,3,4 and 5 km/s.
The respective speeds of the molecules are 1,2,3,4 and 5 km/s. The ratio of their r.m.s. velocity and the average velocity will be
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(a) √11:3 (b) 3:√11 (c) (1:2) (d) (3:4)
Correct […]
A satellite A of mass m is at a distance r from the centre of earth. Another satellite
A satellite A of mass m is at a distance r from the centre of earth. Another satellite B of mass 2m is at a distance 2r from the earth centre. Their time periods are […]
When a mass M is attached to the spring of force constant k,
When a mass M is attached to the spring of force constant k, then the spring stretches by l. If the mass oscillates with amplitude l, what will be the maximum potential energy stored in […]
A uniform rope of length 12 m and mass 6 kg hangs vertically from a rigid support.
A uniform rope of length 12 m and mass 6 kg hangs vertically from a rigid support. A block of masses 2 kg is attached to the free end of the rope. A transverst pulse […]