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A set of 12 tuning forks is arranged in order of increasing frequencies. Each fork produces Y beats per second with the previous one. The last is an octave of the first. The fifth fork
has a frequency of 90 Hz. Find Y and frequency of the first and the last tuning forks.
Concept: Formation of Beats
Doppler effect is not applicable when _______.
(A) source and observer are at rest.
(B) there is a relative motion between source and observer.
(C) both are moving in opposite directions.
(D) both are moving in same direction with different velocities
Concept: Beats
The working of RADAR is based on ...............
a) resonance
b) speed of a star
c) Doppler effect
d) speed of rotation of sun
Concept: Beats
Derive an expression for one dimensional simple harmonic progressive wave travelling in the
direction of positive X-axis. Express it in ‘two’ different forms.
Concept: Simple Harmonic Progressive Waves,
Apparent frequency of the sound heard by a listener is less than the actual frequency of sound emitted by source. In this case _______.
(A) listener moves towards source
(B) source moves towards listener
(C) listener moves away from the source.
(D) source and listener move towards each other.
Concept: Beats
If the source is moving away from the observer, then the apparent frequency _____.
(a) will increase
(b) will remain the same
(c) will be zero
(d) will decrease
Concept: Wave Motion Introduction
Explain the reflection of transverse and longitudinal waves from a denser medium and a rared medium.
Concept: Reflection of Transverse and Longitudinal Waves
What are primary and secondary sources of light?
Concept: Huygens’ Theory
Why are multiple colours observed over a thin film of oil floating on water? Explain with the help of a diagram.
Concept: Interference
The optical path of a ray of light of a given wavelength travelling a distance of 3 cm in flint glass having refractive index 1.6 is the same as that on travelling a distance x cm through a medium having a refractive index 1.25. Determine the value of x.
Concept: Concept of Wave Optics
Describe Young's double-slit interference experiment and derive conditions for occurrence of dark and bright fringes on the screen. Define fringe width and derive a formula for it.
Concept: Interference
What are the conditions for obtaining a good interference pattern? Give reasons.
Concept: Interference
A double-slit arrangement produces interference fringes for sodium light (λ = 589 nm) that are 0.20° apart. What is the angular fringe separation if the entire arrangement is immersed in water (n = 1.33)?
Concept: Interference
Light of wavelength 5000 A.U. falls on a plane reflecting surface. The frequency of reflected light is ______
Concept: Nature of Light
Light follows wave nature because ______
Concept: Concept of Wave Optics
What is the shape of the wavefront on Earth for Sunlight?
Concept: Reflection of Light at a Plane Surface
In Young’s double-slit experiment, if there is no initial phase difference between the light from the two slits, a point on the screen corresponds to the 5th minimum. What is the path difference?
Concept: Nature of Light
Why two light sources must be of equal intensity to obtain a well-defined interference pattern?
Concept: Interference
