If source and observer are moving towards each other with same speed and aftercrossing they are
receding each other then frequency observed by observer:
The spectrum of a starβs light is measured and the wavelength of one of the lines as thesodiumβs line is found
to be 589 nm. The same line has the wavelength of 497 nm whenobserved in the laboratory. This means the
star is
Figure represents a graph of kinetic energy (K) of the photoelectrons (in eV) and frequency (v) for a metal used as cathode in photoelectric experiment. The work function of metal is:
. A force "F1" acts on a body through distance "S1" in the direction of motion and does work "W1". Similarly
another force "F2" act on same body through distance "S2" but in opposite to the direction of motion and does
work "W2". Now if F1 = F2 and S1 = S2 then which statement is correct.
A listener observes the frequency βfβ of stationary source. If it move toward with 3
times of velocity of sound. Then the apparent frequency of the sound will be
A charge of 2C experiences a force 2000N in a uniform electric field. In this fieldthe potential
difference between two points separated by a distance 1cm is
A sonar depth finder in a boat uses sound signals to determine the depth of water. Fourseconds after the sound leaves the boat it returns to the boat because of reflection fromthe bottom. Assume the speed of sound in water is 1,460 meters per second. The depth of the water is, in meters, :
A whistle is revolved with high speed in a horizontal circle of radius R. to an observer at the centre of the circle the frequency of the whistle will appear to be: