Thermodynamics — Physics STD 11 Science — Question

A transparent paper (refractive index = 1.45) of thickness 0.02mm is pasted on one of the slits of a Young's double slit experiment which uses monochromatic light of wavelength 620nm. How many fringes will cross through the centre if the paper is removed?

The volume of a metal sphere is 1000cm³ at 273K. What would be its volume at 373K? Coefficient of linear expansion of the metal is 18 × 10^-6K^-1.

A point source is placed at a depth h below the surface of water (refractive index = μ).

1. Show that light escapes through a circular area on the water surface with its centre directly above the point source.
2. Find the angle subtended by a radius of the area on the source.

Calculate the mean free path of a molecule of a gas at a room temperature and one atmospheric pressure. The radius of the gas molecules (avg) is 2 × 10^-10m?

Answer the following questions:

A man with a wristwatch on his hand falls from the top of a tower. Does the watch give correcttime during the free fall?

In which of the following examples of motion, can the body be considered approximately a point object:
A monkey sitting on top of a man cycling smoothly on a circular track.

The charge on a proton is +1.6 × 10^-19C and that on an electron is -1.6 × 10^-19C. Does it mean that the electron has a charge 3.2 × 10^-19C less than the charge of a proton?

A mass M₁ revolves around another mass M₂ in a path of radius r, what is the angular momentum associated with M₁?

A particle of mass 200g is whirled into a vertical circle of radius 80cm using a massless string. The speed of particle when the string makes an angle 60° with the vertical line is 1.5ms^-1 What is the tension in the string is this position?