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Questions

Physics

The area of cross-section, length and density of a piece of metal of atomic weight 60 are 10^-6 m², 1.0 m and 5 x 10³ kg m^-3 respectively. Find the number of free electrons per unit volume if every atom contributes one free electron. Also find the drift velocity of electrons in the metal when a current of 16 A passes through it. (Given : Avogadro number N_A = 6 x 10²³ mol^-1)

Chemistry

Increasing/Decreasing Characteristics

Increasing acid strength

HClO₃, HClO₄, HClO₂, HClO

Mathematics

Multiple Choice Question
If in a triangle ABC, a cos² (C/2) + c cos² (A/2) = 3b/2 then the sides of the triangle are in

(a)	A.P.	(b)	G.P.
(c)	H.P.	(d)	none of these

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