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Monochromatic light of frequency 6.0 x 1014 Hz is produced by a laser. The power emitted is 2 x 10 − 3 W . The number of photons emitted, on the average, by the source per second is
A distance 'r' from a point charge, the ratio u/ V2 (where 'u' is energy density and 'V' is potential) is represented by:
Two liquids of densities ρ₁ and ρ₂ and coefficients of viscosity η₁ and η₂ are found to flow through a capillary tube at the same rate. The ratio of η₁/η₂ is
A wire of length L and area of cross-section A is made of material of Young's modulus y. If the wire is stretched by the amount x, the work done is
A projectile can have the same range 'R' for two angles of projection. If 't₁' and 't₂' be the times of flights in the two cases, then the product of the two time of flights is proportional to
A block of mass 'm' rests on a horizontal table. A string tied to the block is passed on a frictionless pulley fixed at the end of the table and to the other end of string is hung another block of mass 'm'2. The acceleration of the system is
The kinetic energy of a particle, executing simple harmonic motion is 16 J when it is in its mean position. If the amplitude of oscillations is 25 cm and the mass of the particles is 5.12 kg, the time period of its oscillation is
Two points are located at a distance of 10 m and 15 m from the source of oscillation . The period of oscillation is 0.05 sec and the velocity of the wave is 300 m/sec. What is the phase difference between the oscillations of two points ?
If I is the moment of inertia of a body and ω is its angular velocity, then the rotational kinetic energy is