NEET Physics: Questions 1354 - 1356 of 2098

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Question number: 1354

» Wave Optics » Polarization

MCQ▾

Question

V 0 and V E represent the velocities, µ 0 and μ E the refractive indices of ordinary and extraordinary rays for a doubly refracting crystal. Then

Choices

Choice (4) Response

a.

V0VE,μ0μE if the crystal is calcite

b.

V0VE,μ0μE if the crystal is quartz

c.

V0VE,μ0μE if the crystal is quartz

d.

V0VE,μ0μE if the crystal is calcite

Question number: 1355

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

A uniform steel wire of density 7500 kg/m 3 is 2.5 m long and weighs 15.6 x 10 -3 kg. It extends by 1.25 mm when loaded by 10 kg. Calculate the value of young’s modulus of elasticity for steel.

Choices

Choice (4) Response

a.

2.3 × 10 11 N/m 2

b.

2.96 × 10 11 N/m 2

c.

19.6 × 10 11 N/m 2

d.

None of the above

Question number: 1356

» Wave Optics » Wavefront

MCQ▾

Question

In the given diagram, CP represents a wavefront and AO & BP, the corresponding two rays. Find the condition on θ for constructive interference at P between the ray BP and reflected ray OP

Wavefront diagram with CP as wavefront

Wavefront Diagram With CP as Wavefront

In the given diagram, CP represents a wavefront and AO & BP, the corresponding two rays.

Choices

Choice (4) Response

a.

secθcosθ=λd

b.

secθcosλ=4λd

c.

cosθ=3λ2d

d.

cosθ=λ4d

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