Physics question and answers for October 28, 2023
- Q A light beam shines through a thin slit and illuminates a distant screen The central bright fringe on the screen is 1 00 cm wide as measured between the dark...
- Q 2 7 Two Polaroids P and P are placed with their axis perpendicular to each other Unpolarised light I is incident on P A third polaroid P is kept in...
- Q 7 Let S and S be the two slits in Young s double slit experiment If central maxima is observed at P and angle S PS 0 0 is small...
- Q In a Young s double slit experiment the fringes are displaced by a distance x when a glass plate of refractive index 1 5 is introduced in the path of...
- Q Aa and Am are the wavelengths of a beam of light in air and medium respectively If 0 is the polarising angle the correct relation between a m and 0...
- Q An electric bulb illuminates a plane surface The intensity of illumination on the surface at a point 2 m away from the bulb is 5x 10 phot lumen sq cm...
- Q Two coherent sources S and S are placed at a distance 2d from each other and have wavelength d where 3 5 as shown in the figure The number of...
- Q What will happen when the light suffers refraction while it travels from a rarer denser medium 1 Its wavelength increases but frequency remains constant 2 Its wavelength decreases but frequency...
- Q In Young double slit interference experiment the distance between two sources is 0 1 mm The distance of the screen from the sources is 20 cm Wavelength of light used...
- Q 3 0 225 cm 4 0 25 cm In single slit diffraction light of wavelength 5 5000A is used Distance of screen from slit is 3m Distance between 2nd dark...
- Q Two balls at the surface of a pond are moved up and down in phase and at the same frequency They make the interference pattern shown above on the pond...
- Q 3 Two slits S and S illuminated by a white light 2 source give a white central maxima A transparent sheet of refractive index 1 25 and thickness t is...
- Q In a young s double shit interference patter the intensity of the central fringe at P I when one slit width is reduced to one fourth the intensity at P...
- Q A flat mirror revolves at constant angular 6 velocity making 2 rad s with what speed will a light spot move along a spherical screen with a radius of 10...
- Q Example 3 A rod AB of length 5 cm lies along the principal axis of the concave mirror of focal length 15 cm in such a way that the end...
- Q Topic SYLLABUS 5 6 In a Young s double slit experiment the slits are 1 2 mm apart and are illuminated with a mixture of two wavelength 750nm and A...
- Q D When a YDSE is performed using a monochromatic source of light fringe width is found to be 1 2 mm The minimum distance above 3 4 central maxima at...
- Q A microscope is focussed on a point at the base of an empty vessel Now water 3 is poured in it up to a height of 4 cm Next a...
- Q 2 5 5 Two polaroid sheets are placed one over the other with their axes inclined to each other at an angle 8 If only 12 5 of intensity of...
- Q In the adjacent diagram CP represents wavefront and AO and BP corresponding two rays If one particular condition on maximum e for destructive interference at P between the ray BP...
- Q A source passing a stationary observer is emitting a frequency of 560 Hz If the speed of sound is 345 m s what must the speed of the source be...
- Q F Light of wavelength 442 nm is sent through a single slit with a width of 884 nm At what angle does the first dark fringe occur 30 degrees 45...
- Q What is a wave front O the lower half of a wave the upper half of a wave O the front edge of a wave O one complete crest and...
- Q apart they are driven by one 679 Hz oscillator and therefore emit identical sound waves in phase with one another at the respective points of origin The speed of sound...
- Q 10 In an investigation to test Thomas Young s double slit experiment a helium neon laser is used to produce an interference pattern on a screen a Use the following...
- Q 11B Light can be polarized Explain what this means and how it influences our understanding of th type of wave that light is Briefly describe two ways in which light...
- Q convex lens of focal length 15 cm is split into two halves and the two halves are placed at a separation of 120 cm Between the two halves of convex...
- Q According to the theories of modern physics a photon is a a particle b a wave c a solid flat beam or ray d both a wave and a particle
- Q One side of a glass slab is silvered as show in figure A ray of light is incident on the other side at angle of incidence i 45 R I...
- Q Consider the following statements and then mark the incorrect statement s a The actual separation of the fringes increases if the screen is moved towards the plane of the slits...
- Q A beam of light AO is incident on a glass slab 1 54 in a direction as shown in figure The reflected ray OB is passed through a Nicol prism...
- Q lens of focal length 20 cm d convex lens of focal length 20 m 40 Rays from Sun converge at a point 20 cm in front of a concave mirror...
- Q NE PHYS Q 109 Light rays from a source are incident on a Q 109 glass prism of index of refraction and angle of prisma At near normal incidence the...
- Q Light waves of intensities and 9 interfere to produce a fringe pattern on a screen The phase difference between the wave at a point P is 3 and 2 at...
- Q In a double slit experiment the slit separation is 1 mm What should be the width of each of the slits so as to get 20 maxima of the double...
- Q from principal axis is equal to the focal length of the mirror The ratio of the distance of point B to the distance of the focus from the centre of...
- Q In Young s double slit experiment a slit is covered with thin film so that the optical path difference introduced between coherent waves is 5A Then the new position o...
- Q A lens of power 2D and lens of power 1 D are placed in close contact with each other The combination will behave like i a convergent lens of focal...
- Q wavelength 500 10 9 m d 1 10x10 4 m L 2 5 m x distance for 1st dark minimum fringe 0 01136 m theta for dark minimum 0 260...
- Q Which of the following statements is INCORRECT A When visible light passes through a prism red colour undergoes the least deviation B In an optical fibre the refractive index of...
- Q The diagram below shows a pulse travelling along a rope from X to Y The end Y of the is tied to a fixed support rope X Y When the...
- Q ALLEN 50 In Young s experiment monochromatic light is used to illuminate the two slits A and B Interference fringes are observed on a screen placed in front of the...
- Q ax br 2 abxt Equation of a travelling wave is y 5e a 25 m and b 9 sec A Travelling wave is propagated along x direction B Travelling wave...
- Q In a YDSE the upper slit is covered by a thin glass plate of refractive index 1 2 while the lower slit is covered by another glass plate having same...
- Q The refractive index of glass is 3 2 What is the polarizing angle for glass in degrees Plane polarized light is incident on an analyser The intensity then becomes three...
- Q polarized of water 1 33 in degrees 1 od An analyser is inclined to a polarizer at an angle of 30 The intensity of light emerging from o thaf polarizer...
- Q WO0028 he equations first wave 36 If intensity ratio of two interfering waves is 9 1 then ratio of maximum to minimum amplitude of resultant wave is 1 2 1...
- Q A person can see clearly objects only when they lie between 50 cm and 400 cm from his eyes In order to increase the maximum distance of distinct vision to...
- Q Red light of wavelength 625 nm is incident normally on an optical diffraction grating with 2x105 lines m Including central principal maxima how many maxima may be observed on a...
- Q In Young s double slit experiment the separation between the slits is 4A A is the wavelength of the light used The maximum number of maxima formed on the screen...
- Q A thin film of plastic n 1 56 is 0 25 m thick It is sandwiched between two glass slabs with refractive index of 1 58 and 1 52 respectively...
- Q 28 Monochromatic red light is shone from above on two soap films A and B as shown below An observer at position X observes that film A appears uniformly red...
- Q In the following question a statement of assertion A is followed by a statement of the reason R A On increasing the phase difference from to in YDSE the intensity...
- Q In a Young s double slit experiment the separation between the two slits is d and the wavelength of the light is The intensity of light falling on slit 1...
- Q Q 1 Consider a light beam incident from air to a glass slab at Brewster s angle as shown in the figure A polaroid is placed in the path of...
- Q Out of the following statements which is not correct 1 When upolarised light passes through a Nicol s prism the emergent light is elliptically pola 2 Nicol s prism works...
- Q In Young s Double slit experiment a thin glass mica strip of thickness t 152 is pasted infront of slit S If the same strip is now shifted in front...
- Q In a Young s double slit experiment two thin transparent sheets are used in front of the slits S and S t 1 One of thin sheet has refractive index...
- Q In standard YDSE the ratio of the intensity at the center of a bright fringe to the intensity at a point one quarter of the fringe width from the center...
- Q In a YDSE setup we plot the phase difference 6 between both waves at point P on the screen against the angular position 0 of point P on the screen...
- Q In a YDSE set up a thin sheet is placed in front of one of the slits as shown Refractive index of material where 1 x is distance from left...
- Q The fringe widths are found to be a and respectively if a Young s double slit experiment is performed in medium of refractive index n and 12 respectively The correct...
- Q In a Young s double slit experiment the two slits act as coherent sources of waves of equal amplitude A and wavelength A In another experiment with the same arrangement...
- Q Which statement is not true for the polarization of light 1 Light vibrations are restrained only in one plane 2 Establishes the longitudinal nature of light 3 The intensity of...
- Q In Young s double slit experiment the slits are separated by 0 28 mm and the screen is placed 1 4 m away The width of bright fringe is measured...
- Q 7 If there are N atoms in a source of Laser light and each atom is emitting light with intensity I then the total intensity produced by it is NCERT...
- Q Question No 37 Single Correct A A Consider Fraunhofer diffraction pattern obtained with a single slit illuminated at normal incidence At the angular position of the first diffracti minimum the...
- Q In Young s double slit experiment the wavelength of light was changed from 7000 to 3500 A While doubling the separation between the slits which of the following is not...
- Q COFEAINEREN SERENE ORENS E ALLEN 68 The focal length of a convex lens is 10 cm and its refractive index is 1 5 If the radius of curvature of one...
- Q The figure shows two points sources which emit light of wavelength in phase with each other and are at a distance d 5 5 apart along a line which is...
- Q White light is used to illuminate the two slits in Young s experiment The separation between the slits is b and the screen is at a distance d b from...
- Q 3 otential Increase with increase in frequency Monochromatic light of frequency 6 1014 Hz is produced by a laser The power emitted is 2 x 10 3 W The number...
- Q electron microscope uses electrons accelerated by a voltage of 50 KV how does the resolving power of this electron microscope compare with that of an optical microscope which uses yellow...
- Q 43 In a double slit experiment n fringes are observed to be formed on a screen placed at a distance D from the slits when light of wavelength is used...
- Q c Distinguish between the edge and screw 3 a Monochramatic X rays of 1 51A are incident on a crystal face having an interplaner spacing of 1 61A Find various...
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