NEET Physics: Questions 1226 - 1230 of 2099
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Question number: 1226
A lead bullet at 25°C just n tits when stopped by an obstacle. Assuming that 25 % of heat is absorbed by the obstacle, then the velocity of the bullet at the time of striking (M. P. of lead = 320°C, specific heat of lead = 0.02 cal/gm°C, latent heat of fusion of lead = 6 cal/gm and J = 4.2 joule/cal)
|d.||None of the above|
Question number: 1227
Question number: 1228
Two Polaroids are oriented with their planes perpendicular to incident light and transmission axis making an angle of 30 0 with each other. What fraction of incident unpolarised light is transmitted?
Question number: 1229
Question number: 1230
Out of the following statements which are correct?
(1) Nicol prism works on the principle of double refraction and total internal reflection
(2) Nicol prism can be used to produce and analyses polarised light
(3) Calcite and Quartz are both doubly refracting crystals
(4) When unpolarised light passes through a Nicol prism, the emergent light is elliptically polarized
Select the correct answers and mark it according to the following codes:
1 and 3 are correct
1, 2 and 3 are correct
2 and 4 are correct
1 and 2 are correct