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An elementary particle is: (1)An element present in a compound (2)An atom present in an element (3)A sub-atomic particle (4)A fragment of an atom Ans: (3)A s
The work done by a friction force is: a) Always positive b) Always negative c) Always zero d) Either positive or negative depending upon the situation. An
a) You are travelling in a rocket in a totally vacant universe. The rocket is travelling at 100 m.s -1 and accelerates at 10g for 3 minutes. How fast are you travelling at th
examples of unlike parallel forces
Figure shows the magnetic circuit of a relay. When each of the air gaps are 1.5mm wide find the mmf required to produce a flux density of 0.75 T in the air gaps. Use the B-
What are the disadvantages of fibers optics? This must be borne in mind that the real nature of the conductor, in lighting systems, shows only one of the components responsible
An approximate equation for the velocity distribution in a rectangular channel with turbulent flow is where umax is the velocity at the surface, y is the distance from the
1. What is the principle of gas filled detectors? 2. What are nuclear radiations or particle detectors?
A radiation of 500nm is incident on a metal surface whose work function is 3ev.why do we not observe the phenomenon of photoelectric effect? Ans) Because the energy of radiation i
Explain the term 'work function' of a metal. The threshold frequency of a metal is f 0 . When the light of frequency 2f 0 is incident on the metal plate, the maximum velocity of e
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