Out of the given four waves (1), (2), (3) and (4) y = 20 sin (100 pt)…………(1) y = 20 sin (101 pt)…………(2) y = 20 cos (100 pt)…………(3) y = 20.1 sin (100 pt)…………(4) Emitted by four different sources S1, S2, S3 and S4 respectively, interference phenomena would be observed in space under appropriate conditions when (a) Source S1 emits wave (1) and S4 emits wave (4) (b) Source S2 emits wave (2) and S4 emits wave (4) (c) Source S1 emits wave (1) and S3 emits wave (3) (d) Interference phenomenon can not be observed by the combination of any of the above waves.

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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