Q291: A progressive wave moving along X-axis is represented by y = Asin [2π/λ (vt- x)]. The wavelength (λ) at which the maximum particle velocity is 3 time the wave velocity is?
Q292: 22320 calheat is supplied to 100g of ice at zero degree centigrade. If the latent heat of fusion of ice is 80 cal/g and latent heat of vaporization of water is 540 cal/g the final amount of water thus obtained and its temperature respectively are _____?
Q293: An object placed in front of a concave mirror at a distance of X cm from the pole gives a 3 times magnified real image if it is moved to distance of X+5cm, the Magnification of the image becomes 2. The focal length of the mirror is _____?
Q294: When a spring is stretched by 10 cm, the potential energy is stored is E. when the spring is stretched by 10cm more, the potential energy stored in the spring becomes?
Q295: A bullet on penetrating 30cm into its target A loses its velocity by 50%. What additional distance will its penetrate into the target before it comes to rest?
Q296: Let L be the length and d be the diameter of B cross section of a wire. Wires of the same material with different L and d are subjected to the same tension along the length of the wire. In which of the following cases the extension of wire will be the maximum?
Q297: When a certain metal surface is illuminated with light of frequency v. the stopping potential for photoelectric current is V0. When the same surface is illuminated by light of frequency V/2, the stopping potential is V0-/4. The threshold frequency for photoelectric emission is ______?
Q298: The point at which an applied force A produces linear motion but no rotatory motion is _____?
Q299: Average distance of the earth from the sun A is L1. If one year of the earth =D days one year of another planet whose average distance from the sun is L2 will be ______?
Q300: A particle is projected from the ground with C kinetic energy E at an angle of 60 degree with the horizontal. Its kinetic energy at the highest point of its motion will be ____?