JEE Questions for Physics Wave Optics Quiz 5 - MCQExams.com

A wave can transmit .... from one place to another
  • Energy
  • Amplitude
  • Wavelength
  • Matter
Two identical light waves, propagating in the same direction, have a phase difference δ. After they superpose, the intensity of the resulting wave will be proportional
  • cos δ
  • cos (δ / 2)
  • cos2(δ / 2)
  • cos2 δ
Two identical light sources S1 and S2 emit light of same wavelength λ. These light rays will exhibit interference if
  • Their phase difference remain constant
  • Their phases are distributed randomly
  • Their light intensities remain constant
  • Their light intensities change randomly
Wave nature of light follows because
  • Light rays travel in a straight line
  • Light exhibits the phenomena of reflection and refraction
  • Light exhibits the phenomenon of interference
  • Light causes the phenomenon of photoelectric effect
If L is the coherence length c the velocity of light, the coherent time is

  • Physics-Wave Optics-95445.png
  • 2)
    Physics-Wave Optics-95446.png

  • Physics-Wave Optics-95447.png

  • Physics-Wave Optics-95448.png
If the amplitude ratio of two sources producing interference is 3 : 5, the ratio of intensities at maxima and minima is
  • 25 : 16
  • 5 : 3
  • 16 : 1
  • 25 : 9
For constructive interference to take place between two monochromatic light waves of wavelength λ, the path difference should be

  • Physics-Wave Optics-95451.png
  • 2)
    Physics-Wave Optics-95452.png

  • Physics-Wave Optics-95453.png

  • Physics-Wave Optics-95454.png
wo sources of waves are called coherent if
  • Both have the same amplitude of vibrations
  • Both produce waves of the same wavelength
  • Both produce waves of the same wavelength having constant phase difference
  • Both produce waves having the same velocity
Soap bubble appears coloured due to the phenomenon of
  • Interference
  • Diffraction
  • Dispersion
  • Reflection
Which of the following statements indicates that light waves are transverse?
  • Light waves can travel in vacuum
  • Light waves show interference
  • Light waves can be polarized
  • Light waves can be diffracted
Two sources to same intensity interfere at a point and produced resultant I. When one source is removed, the intensity at that point will be
  • I
  • I/2
  • I/4
  • I/3
Two light source are said to be coherent if they are obtained from
  • Two independent point sources emitting light of the same wavelength
  • A single point source
  • A wide source
  • Two ordinary bulbs emitting light of different wavelengths
Wavelength of light of frequency 100 Hz
  • 2 × 106 m
  • 3 × 106 M
  • 4 × 106 m
  • 5 × 106 m
Evidence for the wave nature of light cannot be obtained from
  • Reflection
  • Doppler effect
  • Interference
  • Diffraction
In Huygens\'s wave theory, the locus of all points in the same state of vibration is called
  • A half period zone
  • Oscillator
  • A wave-front
  • A ray
Wavefront means
  • All particles in it have same phase
  • All particles have opposite phase of vibrations
  • Few particles are in same phase, rest are in opposite phase
  • None of the above
Wavefront of a wave has direction with wave motion
  • Parallel
  • Perpendicular
  • Opposite
  • At an angle of θ
Which one of the following phenomena is not explained by Huygen\'s construction of wavefront?
  • Refraction
  • Reflection
  • Diffraction
  • Origin of spectra
A thin film of soap solution (µs = 1.lies on the top of a glass plate (µg = 1.5). When visible light is incident almost normal to the plate, two adjacent reflection maxima are observed at two wavelengths 420 and 630 nm. The minimum thickness of the soap solution are
  • 420 nm
  • 450 nm
  • 630 nm
  • 1260 nm
Which of the following is conserved when light waves interfere?
  • Intensity
  • Energy
  • Amplitude
  • Momentum
Intensity of light depends upon
  • Velocity
  • Wavelength
  • Amplitude
  • Frequency
Ray diverging from point source form a wave front that is
  • Cylindrical
  • Spherical
  • Plane
  • Cubical
In a wave, the path difference corresponding to a phase difference of ϕ) is

  • Physics-Wave Optics-95460.png
  • 2)
    Physics-Wave Optics-95461.png

  • Physics-Wave Optics-95462.png

  • Physics-Wave Optics-95463.png
Two coherent sources intensities, I1 and I2 produce an interference pattern. The maximum intensity in the interference pattern will be

  • Physics-Wave Optics-95465.png
  • 2)
    Physics-Wave Optics-95466.png

  • Physics-Wave Optics-95467.png

  • Physics-Wave Optics-95468.png
Newton postulated his corpuscular theory on the basic of
  • Newton's rings
  • Colours of thin films
  • Rectilinear propagation of light
  • Dispersion of white light
Wave nature of light is verified by
  • Interference
  • Photoelectric effect
  • Reflection
  • Refraction
Two waves of intensity I undergo Interference. The maximum intensity obtained is
  • I / 2
  • I
  • 2I
  • 4I
Laser beams are used to measure long distance because
  • They are monochromatic
  • They are highly polarised
  • They are coherent
  • They have high degree of parallelism
Huygen\'s principle of secondary wavelets may be used to
  • Find the velocity of light in vacuum
  • Explain the particle behavior of light
  • Find the new position of the wavefront
  • Explain photoelectric effect
To demonstrate the phenomenon of interference, we require two source which emit radiation
  • Of the same frequency and having a definite phase relationship
  • Of nearly the same frequency
  • Of the same frequency
  • Of different wavelengths
If the distance between a point source and screen is doubled, then intensity of light on the screen will become
  • Four times
  • Double
  • Half
  • One-fourth
The wave theory of light wave given by
  • Maxwell
  • Planck
  • Huygen
  • Young
What is the minimum thickness of a thin film required for constructive interference in the reflected light from it?
Given, the refractive index of the film = 1.5, wavelength of the light incident on the film = 600 nm
  • 100 nm
  • 300 nm
  • 50 nm
  • 200 nm
The principle of superposition is basic to the phenomenon of
  • Total internal reflection
  • Interference
  • Reflection
  • Refraction
  • Polarization
Light waves can propagate through vacuum but sound waves cannot do so. Mark the wrong statement
  • Light waves are transverse electromagnetic waves and do not require any medium for their propagation
  • Sound waves are longitudinal mechanical waves and require intertial and elastic medium for their propagation
  • Velocity of light for all transparent media is same
  • Velocity of light for all transparent media is different
Young\'s experiment establishes that
  • Light consists of waves
  • Light consists of particles
  • Light consists of neither particles nor waves
  • Light consists of both particles and waves
If the total electromagnetic energy falling on a surface is U, then the total momentum delivered (for complete absorption) is

  • Physics-Wave Optics-95697.png
  • cU

  • Physics-Wave Optics-95698.png
  • c2U
In the interference pattern, energy is
  • Created at the position of maxima
  • Destroyed at the position of minima
  • Conserved but is redistributed
  • None of the above
Monochromatic green light of wavelength 5 × 10–7 m illuminates a pair of slits 1 mm apart. The separation of bright lines on the interference pattern formed on a screen 2 m away is
  • 0.25 mm
  • 0.1 mm
  • 1.0 mm
  • 0.01 mm
If the eighth bright band due to light of wavelength λ1 coincides with ninth bright band from light of wavelength λ2 in Young\'s double slit experiment, then the possible wavelength of visible light are
  • 400 nm and 450 nm
  • 425 nm and 400 nm
  • 400 nm and 425 nm
  • 450 nm and 400 nm
In Young\'s double slit interference experiment, the slit separation is made 3 fold. The fringe width becomes
  • 1/3 times
  • 1/9 times
  • 3 times
  • 9 times
In a certain double slit experimental arrangement interference fringes of width 1.0 mm each are observed when light of wavelength 5000 Å is used. Keeping the set up unaltered, if the source is replaced by another source of wavelength 6000 Å, the fringe width will be
  • 0.5 mm
  • 1.0 mm
  • 1.2 mm
  • 1.5 mm
The figures shows a double slit experiment where P and Q are the slits. The path length PX and QX are nλ and (n +λ respectively, where n is a whole number and A is the wavelength. Taking the central fringe as zero, what is formed at X?
Physics-Wave Optics-95477.png
  • First bright
  • First dark
  • Second bright
  • Second dark
In Young\'s double slit experiment, if one of the slits is closed fully, then in the interference pattern
  • A bright slit will be observed, no interference pattern will exist
  • The bright fringes will becomes more bright
  • The bright fringes will become fainter
  • None of the above
In Young\'s double slit experiment, a glass plate is placed before a slit which absorbs half the intensity of light. Under this case
  • The brightness of fringes decreases
  • The fringe width decreases
  • No fringes will be observed
  • The bright fringes becomes fainter and the dark fringes have finite light intensity
The maximum intensity of fringes in Young\'s experiment is I. If one of the slit is closed, then the intensity at that place becomes I0. Which of the following relation is true?
  • I = I0
  • I = 2 I0
  • I = 4 I0
  • There is no relation between I and I0
In a Young\'s double slit experiment (slit distance d monochromatic light of wavelength λ is used and the figure pattern observed at a distance L from the slits. The angular position of the bright fringes are

  • Physics-Wave Optics-95480.png
  • 2)
    Physics-Wave Optics-95481.png

  • Physics-Wave Optics-95482.png

  • Physics-Wave Optics-95483.png
The Young\'s experiment is performed with the lights of blue (λ = 4360 Å) and green colour (λ = 5460Å ), If the distance of 4th fringe the centre is x, then

  • Physics-Wave Optics-95485.png
  • 2)
    Physics-Wave Optics-95486.png

  • Physics-Wave Optics-95487.png

  • Physics-Wave Optics-95488.png
In the Young\'s double slit experiment, the spacing between two slits is 0.1 mm. If the screen is kept at a distance 1.0 m from the slits and the wavelength of light is 5000 Å, then the fringe width is
  • 1.0 cm
  • 1.5 cm
  • 0.5 cm
  • 2.0 cm
In Young\'s double slit experiment, if L is the distance between the slits and the screen upon which interference pattern is observed, x is the average distance between the adjacent fringes and d being the slit separation. The wavelength of light is given by

  • Physics-Wave Optics-95491.png
  • 2)
    Physics-Wave Optics-95492.png

  • Physics-Wave Optics-95493.png

  • Physics-Wave Optics-95494.png
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Physics Quiz Questions and Answers