The radius of the first orbit of the electron in a hydrogen atom is 5.3 x 10-11 m; then the radius of the second orbit must be A. 15.9 x 10^-11 m B. 10.6 x 10 m C. 21.2 x 10^-11 m D. 42.4 x 10^-11 m

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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