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Define the terms threshold frequency and stopping potential in relation to the phenomenon of photoelectric effect. How is the photoelectric current affected on enhancing the
(i) frequency
(ii) intensity of the incident radiations and why?
is voltage source have infinite internal resistance
A bar magnet is overhanging north end up well above a vertical coil of wire. The bar magnet is released and as it falls down toward the coil it falls along a path that will take it
Q. When the negative feedback is practical to an amplifier of gain 50 the gain falls to 25. Compute the feedback ratio? Af = A / 1 + Aβ 25 = 50 / 1 + 50 β 1 = 2 / 1 + 50
NEWTON'S FIRST LAW OF MOTION: This law states that "A body at rest will remain at rest and a body moving with uniform velocity will carry on doing so, until acted on by some un
Determine where r is the position vector.
Q. Give the basic assumptions made in free electron model of solid. OR Write down basic postulates of Sommerfield's free electron gas model. Show that the number of ene
A train locomotive whose mass is 1 x 106 kilograms is travelling EAST at a speed of 100 kilometers per hour. A NORTHERLY wind is applying a force of 100 Newtons on the locomo
Making a sun-dial To withstand all weather, a sun-dial should be form of metal or painted wood. A cardboard model can be formed for easy experiments. The gnomon which casts
Huygen's principl e : Huygen's principle states that every point of a wave front behaves as the source of small secondary wavelets which spread out in all directions with a velocit
Noether theorem (Noether): A theorem which revels that symmetries are what gives increase to conserved quantities. For example, translational symmetry (the fact that the laws
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