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When a pn junction diode is forward biased, energy is released at the junction due to the recombination of electrons and holes. This energy is in energy is released at the junction due to the recombination of electrons and holes. This energy is in When a pn junction diode is forward biased October 21, 2020 [...]

A pn junction diode cannot be used (1) for converting light energy to electrical energy (2) for converting electrical energy to light energy (3) for getting light radiation A pn junction diode cannot be used (1) for converting light energy to electrical energy (2) for converting electrical energy to light energy (3) for getting light [...]

In a factory it is desired to lift 746 kg of metal through a distance of 60 m is 1 min. The minimum horsepower of the engine to be used will be In a factory it is desired to lift 746 kg of metal through a distance of 60 m is 1 min. The minimum [...]

A pump can take out 7200 kg of water per hour from a well 100 m. deep. The power of pump, assuming its efficiency as 50% will be A pump can take out 7200 kg of water per hour from a well 100 m. deep. The power of pump assuming its efficiency as 50% will [...]

A 2kg block slides on a horizontal floor with a speed of 4m/s. It strikes an uncompressed spring and compresses it till the block is motionless. The kinetic friction force is 15N and spring constant is 10,000N/m. The spring compresses by: Work done from d = 0 m to d = 3 m October 21, [...]

A block weighing 10 kg travels down a smooth curved track AB joined to a rough horizontal surface (see the figure.) The rough surface has a friction coefficient of 0.20 with the block. If the block starts slipping on the track from a point 1 m above the horizontal surface, how far will it move [...]

A block of mass 100 g is moved with a speed of 5(m)/(s) at the highest point in a closed circular tube of radius 10 cm kept in a vertical plane. The cross-section of the tube is such that the block just fits in it. The block makes several oscillations inside the tube and finally [...]

In a pure silicon (n1 = 10^16/m^3) crystal at 300 k, 10^21 atoms of phosphorus are added per cubic metre. The new hole concentration will be 10^21 atoms of phosphorus are added per cubic metre. The new hole concentration will be In a pure silicon (n1 = 10^16/m^3) crystal at 300 k October 21, 2020 [...]

A car weighing 1400 kg is moving at speed of 54 km/h up a hill when the motor stops. If it is just able to read the destination which is at a height of 10 m above the point calculate the work done against friction (negative of the work done by the friction). Work done [...]

A block of mass 1 kg is placed at the point A of a rough track shown in the figure. If slightly pushed towards right, it stops at the point B of the track. The work done by the frictional force on the block during its transit from A to B is A block of [...]