A light whose frequency is equal to 6.0 x 10¹⁴ Hz is incident on a metal
A light whose frequency is equal to 6.0 x 10¹⁴ Hz is incident on a metal whose work function is 2 eV. (h= 6.63 x 10⁻³⁴ Js, 1 ev = 1.6 x 10⁻¹⁹ J). The […]
Questions
The current in the windings of a toroid is 2.0 A. There are 400 turns
The current in the windings of a toroid is 2.0 A. There are 400 turns and the mean circumferential length is 40 cm. If the inside magnetic field is 1.0 T, the relative permeability is […]
The maximum and minimum magnitudes of the resultant of two vectors
The maximum and minimum magnitudes of the resultant of two vectors are 17 units and 7 units respectively. If these two vectors are at right angles to each other, the magnitude of their resultant is […]
A wire mesh consisting of very small squares is viewed at a distance
A wire mesh consisting of very small squares is viewed at a distance of 8 cm through a magnifying converging lens of focal length 10 cm, kept close to the eye. The magnification produced by […]
A magnet of length 10 cm and magnetic moment 1 A-m² is placed
A magnet of length 10 cm and magnetic moment 1 A-m² is placed along the side AB of an equilateral triangle ABC. If length of side AB is 10 cm the magnetic induction at the […]
A lead bullet of 10 gm travelling at 300 m/s strikes against a block
A lead bullet of 10 gm travelling at 300 m/s strikes against a block of wood and comes to rest. Assuming 50% of heat is absorbed by the bullet, the increase in its temperature is(sp.heat […]
A calorimeter contains 0.2 kg of water at 30° C. 0.1kg of water at
A calorimeter contains 0.2 kg of water at 30° C. 0.1kg of water at 60° C is added to it. The mixture is well stirred and the resulting temperature is found to be 35° C. […]
A concave mirror ia placed over a beaker containing water of
A concave mirror ia placed over a beaker containing water of (µ = 1.33) and image of the object placed at the bottom of beaker is formed at a distance of 25 cm from the […]
Vessel A is filled with hydrogen while vessel B, whose volume is
Vessel A is filled with hydrogen while vessel B, whose volume is twice that of A is filled with the same mass of oxygen at the same temperature. The ratio of the mean kinetic energies […]
In a parallel plate capacitor of capacitance C, a metal sheet is inserted
In a parallel plate capacitor of capacitance C, a metal sheet is inserted between the plates parallel to them, If the thickness of the sheet is half of the separation between the plates, the capacitance […]