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Q. State any three laws of photo electric emission? (i) For a specified photo sensitive material there is a minimum frequency called the threshold frequency below which emissio
Figure shows the transfer characteristic for an n-p-n silicon transistor.When the base current is 2.5mA, Verify (a) the value of collector current, (b) the static value of
Give reason that ultrasonics not be produced by passing high frequency alternating current by a loud speaker At these high frequencies, inductive reactance is so high where is
Q. A screen is placed 90 cm from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by 20cm. Determine the focal lengt
A plane polarized monochromatic light of wave length 5893Å is incident perpendicularly on a quarter wave plate to produce elliptically polarized light. If the refrac
In X-ray tube, when high speed electrons strike the target, they move into the target. They lose their kinetic energy and come to rest inside the solid. The electron because of fin
A figure separated into squares, each of size 1 mm 2 is being viewed at a distance of 9cm by a magnifying lens of local length 10cm, held close to the eye. (i) Illustrate a ray
Balanced and Unbalanced Forces:- Newton's first law of motion states that "an object at rest stays at rest and an object in motion stays in motion with the similar speed and in
When the current in the primary coil of 400 turns of a magnetic circuit, enhances linearly from10mA to 35mA in 100ms, an e.m.f. of 75mV is induced into the secondary coil of 240 tu
Earth's atmosphere is separated into four layers: The troposphere (0-10 km), the stratosphere (10-50 km), the mesosphere (50-80 km), and the thermosphere (80-500 km).
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