carbon,silicon and germanium have four valence electon each.at room tempreture which one of the following statement is most appropriate? a)the number of free conduction electrons is negligible small in all the three b)the number of free electrons for conduction is significant in all the three. c)the number of free conduction electron is significant in c but small in si and ge d)the number of free electrons for conduction is significant only in si and ge but small in c.

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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