Physics M.C.Q (1 Marks)

Select the right option in the following

In a biprism experiment, by using light of wavelength 5000 Å, 5 mm wide fringes are obtained on a screen 1.0 m away from the coherent sources. The separation between the two coherent sources is

In Young's experiment, one slit is covered with a blue filter and the other (slit) with a yellow filter. Then the interference pattern

In an interference experiment, the spacing between successive maxima or minima is (Where the symbols have their usual meanings)

In a Young's double slit experiment, the central point on the screen is

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

The Young's experiment is performed with the lights of blue (λ = 4360 Å) and green colour (λ = 5460 Å), If the distance of the 4th fringe from the centre is x, then

An oil flowing on water seems coloured due to interference. For observing this effect, the approximate thickness of the oil film should be

In the Young's double slit experiment, the ratio of intensities of bright and dark fringes is 9. This means that

In Young's experiment, the distance between the slits is reduced to half and the distance between the slit and screen is doubled, then the fringe width

In Young's double slit experiment, a glass plate is placed before a slit which absorbs half the intensity of light. Under this case

In Young's double slit experiment, if one of the slit is closed fully, then in the interference pattern

The figure shows a double slit experiment P and Q are the slits. The path lengths PX and QX are nλ and (n+2)λ respectively, where n is a whole number and λ is the wavelength. Taking the central fringe as zero, what is formed at X

Coherent sources are those sources for which

The dual nature of light is exhibited by

Newton postulated his corpuscular theory on the basis of

What causes changes in the colours of the soap or oil films for the given beam of light

Which of the following phenomena can explain quantum nature of light

Two sources give interference pattern which is observed on a screen, D distance apart from the sources. The fringe width is 2w. If the distance D is now doubled, the fringe width will

The phase difference between incident wave and reflected wave is 180° when light ray

If yellow light in the Young's double slit experiment is replaced by red light, the fringe width will

Huygen wave theory allows us to know

In two separate set - ups of the Young's double slit experiment, fringes of equal width are observed when lights of wavelengths in the ratio 1 : 2 are used. If the ratio of the slit separation in the two cases is 2 : 1, the ratio of the distances between the plane of the slits and the screen in the two set - ups is

In Young's double slit experiment when wavelength used is 6000 Å and the screen is 40 cm from the slits, the fringes are 0.012 cm wide. What is the distance between the slits

In Young's double slit experiment, if the widths of the slits are in the ratio 4 : 9, the ratio of the intensity at maxima to the intensity at minima will be

In Young's double slit experiment, the phase difference between the light waves reaching third bright fringe from the central fringe will be (λ =6000 Å )

In Young's experiment, light of wavelength 4000 Å is used to produce bright fringes of width 0.6 mm, at a distance of 2 meters. If the whole apparatus is dipped in a liquid of refractive index 1.5, then fringe width will be

In double slits experiment, for light of which colour the fringe width will be minimum

Young's experiment is performed in air and then performed in water, the fringe width

In a Young's double slit experiment, the fringe width is found to be 0.4 mm. If the whole apparatus is immersed in water of refractive index 4/3 without disturbing the geometrical arrangement, the new fringe width will be

If the distance between a point source and screen is doubled, then intensity of light on the screen will become

As a result of interference of two coherent sources of light, energy is

In the Young's double slit experiment, the spacing between two slits is 0.1 mm. If the screen is kept at a distance of 1.0 m from the slits and the wavelength of light is 5000 Å, then the fringe width is

If an interference pattern have maximum and minimum intensities in 36 : 1 ratio then what will be the ratio of amplitudes

What is the path difference of destructive interference

Huygen’s principle of secondary wavelets may be used to

Two waves have their amplitudes in the ratio 1 : 9. The maximum and minimum intensities when they interfere are in the ratio 

Two coherent sources of different intensities send waves which interfere. The ratio of maximum intensity to the minimum intensity is 25. The intensities of the sources are in the ratio

Laser beams are used to measure long distance because

Light waves producing interference have their amplitudes in the ratio 3 : 2. The intensity ratio of maximum and minimum of interference fringes is

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