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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?
what condition is necessary for heat transfer occur
When two particles tend to each other, their motion alters or their momentum modify because of their mutual interactions. This phenomenon is called as collision. During collision
Calculate the top heat-loss coefficient for a solar collector with a single glass cover having the following specifications (neglect edge effects), also calculate the ambient air t
if electrons are moving from east to west in a conductor is there a flow of current?
Fast neutrons can be changed into slow neutrons by certain materials known as moderator's when last moving neutrons pass by a moderator, they combine with the molecules of the mod
What is black hole
What is the stimulated emission? Define this term briefly. Stimulated emission: a. While photon interacts along with atom that is in the excited state E 2 , in that case de-
What is the hardness of water? How is it expressed? Hardness is the property of water which stops lather formation with soap. This is because of the presence of certain salts o
What is an effect wheel? A disc of polycarbonate or metal revolving among the lamp and the common end along with holes, slits, patterns or colors.
Determine the change in entropy, in joules, when 5 moles of an ideal gas expands from a value of 4 lits. to 40 lits. at 27°C. (R = 8.314 JK -1 mol -1 )
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