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
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The radiations emitted from a rectangular base will show a maxima if
When two progressive waves of intensity I1 and I2 but slightly different frequencies superpose, the resultant intensity fluctuates between
The two slits at a distance of 1 mm are illuminated by the light of wavelength 6.5X10−7m . The interference fringes are observed on a screen placed at a distance of 1 m. The distance between third dark fringe and fifth bright fringe will be
State whether true or false :During destructive interference, the crest of one wave meets the trough of the other wave.
A is singing a note and at the same time B is also singing a note with 1/8th the frequency of A. The energies of the two sounds are equal. The disparagement amplitude of the note if B is:
A slit of size 0.15m is placed at 2.1m from a screen. On illuminated it by a light of wavelength 5×10−5cm. The width of central maxima will be
The intensity of the sound gets reduced by 10% on passing through a slab. The reduction in intensity on passing through two consecutive slab, would be
In deriving the single slit diffraction pattern, it was stated that the intensity is zero at angles of nλ/a. Justify this by suitably dividing the slit to bring out the cancellation.