High sensitivity and S/N ratio. Physics. Which of the following lamp gives nearly monochromatic light ? Light waves travel with a velocity of (A) 3 x 1010cm/s (B) 3 x 1012cm/s (C) 3 x 1015 cm/s (D) 3 x 1018 cm/s 3. The light waves emerging from the two slits then interfere and form an interference pattern on the viewing screen. Sodium vapour lamps is a gas-discharge lamp that uses sodium in an excited state to produce light. Fluurescent tube [D]. Which of the following gives nearly monochromatic light? (b) the choke is provided to limit the current to a safe value. Monochromatic light Heterochromatic light. 6 A laser is a device that gives a narrow parallel beam of monochromatic (single-colour) light. In the sodium lamp, there is a process of heating the sodium and vaporizing. Light from a sodium lamp is passed through two polaroid sheets P 1 and P 2 kept one after the other. Materials which reflect all wavelengths in the light spectrum appear to be (A) black to white (B) transparent (C) opaque (D) green to red. The term light signifies the visible and near-visible portions of the electromagnetic radiation. Electric Illumination MCQ PDF. Which of the following is a source used in spectroscopy? Directionality. Right Answer is: A SOLUTION Sodium vapour lamps gives nearly monochromatic light. In transmitted light the ring system is exactly complementary to the reflected ring system so that the centre spot is bright. Light consisting of a single color i.e. Monochromatic. What are. Materials which reflect all wavelengths in the light spectrum appear to be (A) black to white (B) transparent (C) opaque (A) Sodium vapor lamp (B) GLS lamp (C) Tube light (D) Mercury vapor lamp. Answer: (a) compton effect. Which of the following gives nearly monochromatic. Which of the following statements is true for the same wavelength . Which lamp gives the nearly monochromatic light? The intensity of the light transmitted through the second polarizer is. Physics Chemistry. . A. This light is used to form fringes in an interference experiment in which the light is first amplitude-split into two equal parts and then brought together again. Monochromatic light, on the other hand, gives much narrower fringes which can be observed up to much higher order. (b) photoelectric effect. (Image to be added soon) ii. 13. Q28 :A mercury lamp is a convenient source for studying frequency dependence of photoelectric emission since it gives a number of spectral lines ranging from the UV to the red end of the visible spectrum. Since the spectrum of this light consists primarily of two closely spaced lines I - I0cos²θ. 98. For this reason concave mirrors of parabolic shapes are used, these have a slightly different shape to the spherical mirrors . GLS lamp [C]. a) Reflected radiation and concentration b) Scattered radiation and concentration c) Energy absorption and concentration | Which of the following lamp gives nearly monochromatic light? A 0.5 λ B 1.5 λ If 1 is 480 nm what is 2? 7.05° Polychromatic light. The vertical axis scale is set by α s = 12 rad. [A]. In a tungsten lamp, the output depends upon: (A . A photocell detects the amount of light transmitted or absorbed and gives the reading on the display meter. which of the following gives monochromatic light a.sodium lamp b.mercury lamp c.spark lamp d.all of the above - 48545399 LPS lamps in particular are A light source emits light which is a mixture of two wavelength, 1 and 2. One never finds light of a single wavelength so monochromatic light is light of a very narrow band of wavelengths. C. (a) the main electrodes are made of tungsten wire in the form of helix. D using monochromatic light of higher frequency . Filters: Filters can be used to convert a light source with several wavelengths into monochromatic light. The energy quantization of electromagnetic radiation in general, and of light in particular, is expressed in the famous relation. lampy na 10V lamp not screen The intensity of light on the screen from each lamp separately is 1 On the axes, sketch a graph to show the variation with distance x on the screen of the intensity 1 of light on the screen. We hope the given NCERT MCQ Questions for Class 12 Physics Chapter 10 Wave Optics with Answers Pdf free download will help you. Tungsten Halogen lamp:-It is construction is similar to house hold lamp. None of the above : Answer: Option A Workspace Report . 10-20 lumen/m2 B. 97. So monochromatic light literally means light of one color. The luminous efficiency of a fluorescent tube is a)5-10 lumens/watt b)15-20 lumens/watt c)30-40 lumens/watt d)60-65 lumens/watt. (A) GLS lamp (B) Tube light (C) Mercury vapor lamp (D) Sodium vapor lamp. Let's examine each of these characteristics. Problem 12. High intensity. Monochromatic light of wavelength 589 nm is incident on a grating - the spacing between lines on the grating is 4.8x10-6 m. What is the angle between the zero order and first order maxima? 4 Which of the following phenomena does not occur with sound waves? [2] gives monochromatic light of 589nm. Line spectrum i.e. - In Pitter NPL Gauge interferometry, cadmium or mercury lamp is used as a light source. The calorific value of which of the following files is expected to be nearly equal? A graphene LED bulb is reported to be 10% more efficient than regular LED light bulbs.. (a) €€€€Calculate the fringe separation. One of these lines has a wavelength of 5.890 10−7 m, and the other line has a wavelength of 5.896 10−7 m. a. Answer. 555nm light that is propagating in a vacuum. Tungsten lamp C. Xenon lamp D. Hollow cathode lamp Answer. Then the sodium ionizes to produce monochromatic yellow light. Electric discharge lamp produced light by: (A) Carbon electrodes (B) Ionization in gas or vapors (C) Magnetic effect of current (D) Heating effect of current. Answer Explanation. Experiment 6 - The Photoelectric Effect. Monochromatic light : one wavelength (like a laser) Physical parameters for monochromatic light 1. An object which appears red to the eyes, absorbs (A) green . Explanation: No explanation is available for this question! The diagram shows Young's double-slit experiment performed with a tungsten filament lamp as the light source. Sodium vapour lamp. 6) Consider a crystal of ruby laser whose length is 6 cm and the refractive index is 1.8, emits the wavelength of about 0.55 μm. They emit in a huge range of wavelenghts the spectrum of which is shown in the figure, Whereas A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. (b) €€€€Monochromatic light of wavelength 3.80 × 10í m falls with an intensity of 6.0€ W€mí on to a metallic surface whose work function is 3.2 × 10í J. (d) A laser . Both gratings are illuminated with a beam of the same monochromatic light. A horizontal surface that prevents entry of bright natural day light into a building Which of the following lamp gives nearly monochromatic light? The notion of light quantization was first introduced by Planck. Fig. 1. A polarimeter is a scientific instrument used to measure the angle of rotation caused by passing polarized light through an optically active . Visible light receives its emission from excited electrons (electrons of the higher energy level) are moved down to the lower energy level (ground state). Related Questions A laser emits light of wavelength 6.3 × 10-7 m and is used to illuminate a double slit which has a separation of 2.4 × 10-4 m. Interference fringes are observed 4.2 m from the slits. In conventional light sources like lamps, torchlights, electric bulbs, etc, photons move at random . (a) the slit width, (b) the total number of diffraction minima in the pattern (count them on both sides of. (a) Sodium vapour lamp (c) Tube light (b) GLS lamp (d) Mercury vapour lamp Under the influence of fluorescent lamps sometimes the wheels of rotating machinery appear to be stationery. of 0.75 lagging. light from laser prism screen Fig. A discharge lamp emits light of four colours: red, green, blue and violet. € . Get Answer A 103. It has better efficiency than mercury lamps. In the resulting diffraction pattern, the intensity at the center of the central maximum. Sodium is light intensity therefore, it takes a long lamp tube to produce the monochromatic light. Transcribed image text: (a) Monochromatic light from two identical lamps arrives on a screen. a. Filament heated at 3000k temperature after 3000k temp. 15. Under white light we get coloured fringes. a)Sodium vapor lamp b)GLS Lamp c)Tube light d)Mercury vapor lamp. Find the angle at which the dark fringe 122.5 will be observed if monochromatic light of 6560 A is used as an extended so. The GLS lamp is cheap, easy to replace, and does not require any special device such as a ballast, which is required in fluorescent lamps. Ultraviolet spectrophotometer. I0/2 (cos60)². I0/2 (1/2)². I0/2 (1/4) =I0/8. Hydrogen Discharge lamp :- Important Points: The luminous efficiency of the sodium vapour lamp is of the order of 45 to 50 lumens per watt. It distinguishes a single wavelength from the rest of the light. At a given temperature, the Wien's displacement law gives the . 1. i. Q7. Ans: d. 11. What is the coherence time and length of the light from the monochromator when set to give light of mean wavelength $500 \mathrm{nm} ?$ b. Low-pressure sodium lamps only give monochromatic yellow light and so inhibit colour vision at night. (c) neither (a) nor (b) (d) Both (a) and (b) Answer. The carbon percentage in diesel oil is nearly; The wavelength of green colour is nearly; One barrel is nearly; A 3 phase 15 kW induction motor has a p.f. White light gives colored fringes, isochromatics, which aid in estimating stresses, but has the disadvantage that only a very few colored fringes can be distinguished easily. Consider two diffraction gratings. A graphene LED light bulb is simply an LED light bulb where the filament has been coated in graphene. This is due to A concave mirror is often used behind the bulb in a lamp, searchlight or projector to give a parallel beam of light (the lamp is kept at the focus), but if the aperture of the mirror is too big the beam will spread out. Note: following is the marking scheme, I was thinking the larger the x, the . The hydrogen lamp emits continuous or discontinuous spectral UV- light ranging between 200-450 nm . Using data from the Data Sheet, calculate (i)€€€€€€the energy of a single photon of light of this wavelength, (A) Sodium vapor lamp (B) GLS lamp (C) Tube light (D) Mercury vapor lamp. Radiant efficiency of the luminous source depends on (A) the wavelength of light rays (B) the temperature of the source (C) the shape of the source (D) all of the above 2. Answer (1 of 4): What is monochromatic light, and how is it used? Explanation: Monochromatic light: The single coloured light or of the same wavelength of the light is termed as monochromatic light. light of one particular wavelength. 12. 4 Which of the following phenomena does not occur with sound waves? Sodium is light intensity therefore, it takes a long lamp tube to produce the monochromatic light. Deuterium and tungsten lamps are used as a light source in one of the following techniques. Light of a single wavelength is known as monochromatic light. Spectral composition of . A monochromatic light source is incident on the first screen which contains a slit . Light is the fundamental source of energy on Earth. (c) in addition to two main electrodes a starting (auxiliary) electrode is connected through a high resistance . 30 - 50 lumen/m2 C. 40-75 lumen/m2 D. 100-140 lumen/m2. The . Beer Lambert's law gives the relation between which of the following? - Mercury light source gives 2 yellow, 1 green and 1 violet light. Related Questions When the light is incident on a diffraction grating it is found that the fifth order of light of wavelength 1 occurs at the same angle as the fourth order for light of wavelength 2. (2) (b) (i) For an interference pattern to be observed the light has to be emitted by two (c) A mercury tube. Plane polarized light is incident normally on a polarizer which is able to rotate in the .

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