Define young's modulus and describe a method of measuring its value .

Describe a method of producing plane polarised light.

A metal bar of length L area of cross section A, Young's modulus Y and coefficient of linear expansion a is clamped between two stout pillars. What is the force exerted by the bar when it is heated through t ^@C ?

Explain the terms : Young's modulus of elasticity and elastic fatigue.

Prove that area of the equilateral triangle described on the side of a square is half. The area of the equilateral triangle described on its diagonal.

Two wires of same radius and legth are subjected to the same load . One wire is of steel an the other is of copper . If the young modulus of steel is twice that of copper find the ratio of elastic energy stored per unit volume in steel to that of copper .

The Young's modulus of a wire of length L and radius r is Y. If the length is reduced to L//2 and radius r//2 . What will be its Young's modulus?

Shows the strain-stress curve for a given material. What are (a) Young's modulus and (b) approximate yield strength for this material?

Distinguish between ortho and para hydrogen Describe one method of preparation of H_2O_2 in the laboratory.

Prove that the area of an equilateral triangle described on one side of a square is equal to half the area of the equilateral triangle described on one of its diagonals.

The dimensions of Young's modulus of elasticity is