.In young's double slit experiment with monochromatic light of wave length 600nm, the distance between slits is 10-3m. For changing fringe width by 3×10-5m a) the screen is moved away from the slits by 5cm b) the screen is moved by 5cm towards the slits c) the screen is moved by 3cm towards the slits d) both (a) and (b) are correct

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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