To demonstrate the phenomenon of beats we need (a) Two sources which emit radiation of nearly the same frequency (b) Two sources which emit radiation of exactly the same frequency (c) Two sources which emit radiation of exactly the same frequency and have a definite phase relationship (d) Two sources which emit radiation of exactly the same wavelength

in a physics laboratory a block x is balanced by a block Y of mass 200 kg,each are suspended from a balance of equal lever arms .the scale pan on X is at a height.H1=2 cm ,where as scale pan on Y is at height 1 cm above the floor.the error in weighing is (in gram)

consider the figure of a single riveted lap joint as follows

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cyclic heat engine operates between. temperature of 30 C. What is the least rate of heat rejection per kW net output of an engine. source temperature of 800 C and sink

 

 

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