Physics

An AC circuit has R = 100Ω, C = 2µF and L = 80mH, connected in series. The quality factor of the circuit is:

If the potential energy between two molecules in given by U = A/r¹² - B/r? then at equilibrium, separation between molecules, and the potential energy are:

In the figure below, P and Q are two equally intense coherent sources emitting radiation of wavelength 20 m. The separation between P and Q is 5 m and the phase of P is ahead of that of Q by 90°. A, B and C are three distinct points of observation, each equidistant from the midpoint of PQ. The intensities of radiation at A, B, C will be in the ratio:

A sound source S is moving along a straight track with speed v, and is emitting sound of frequency v? (see figure). An observer is standing at a finite distance, at the point O, from the track. The time variation of frequency heard by the observer is best represented by:
(t? represents the instant when the distance between the source and observer is minimum)

A screw gauge has 50 divisions on its circular scale. The circular scale is 4 units ahead of the pitch scale marking, prior to use. Upon one complete rotation of the circular scale, a displacement of 0.5 mm is noticed on the pitch scale. The nature of zero error involved, and the least count of the screw gauge, are respectively:

 How does the viscosity of a dilute gas change with temperature, and is this similar to liquids?

Why don't gas molecules in a room simply fall to the ground due to gravity?

A body of mass 2 kg, is driven by an engine delivering, a constant power 1 J/s. the body starts from rest and moves in a straight line. After 9 seconds, the body has moved a distance (in m)

Nitrogen has is at 300° temperature. The temperature (in K) at which the rms speed of a H? molecule would be equal to the rms speed of a nitrogen molecule, is (Molar mass of N? gas 28 g)

A prism of angle A = 1° has a refractive index µ = 1.5. A good estimate for the minimum angle of deviation (in degrees) is close to N/10. Value of N is