Waves & Oscillation
A slit of width is illuminated by white light. For red light (λ=6500A˚), the first minima is obtained at θ=30∘. Then the value of will be
A narrow tube is bent in the form of a circle of radius R, as shown in
the figure. Two small holes S and D are made in the tube at the
positions right angle to each other. A source placed at S generated a
wave of intensity l0 which is equally divided into two parts :
One part travels along the longer path, while the other travels along
the shorter path. Both the part waves meet at the point D where a
detector is placed. The maximum value of λ to produce a minima at D is given by :
In Young's double slit experiment using monochromatic light of wavelength λ, the intensity of light at a point on the screen where path diff. is λ is K units. Find the intensity of light at a point where path difference is λ/3.
Sound waves from a tuning fork A reach a point P by two separate paths ABP and ACP. When ACP is greater than ABP by 11.5 cm, there is silence at P. When the difference is 23 cm the sound becomes loudest at P and when 34.5 cm there is silence again and so on. Calculate the minimum frequency (in Hz) of the fork if the velocity of sound is taken to be 331.2 m/s.
Two waves of amplitudes A and 3A are superposed and they have a phase difference of π. What kind of interference is possible
What is the shape of the wavefront in each of the following cases:
(a) Light diverging from a point source.(b) Light emerging out of a convex lens when a point source is placed at its focus.(c) The portion of the wavefront of light from a distant star intercepted by the Earth.
A material having an index of refraction of 1.30 is used as an anti-reflective coating on the price of glass (n=1.50). What should the minimum thickness of this film be to minimize the reflection of 500-nm light?