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The work function for a given photosensitive surface is equal to 2·5 eV. When light of frequency v falls on this surface, the emitted photoelectrons are completely stopped by applying a retarded potential of 4·1 V. Estimate the value of frequency v of light. (Physics CBSE 2018)1 AnswerA light beam of intensity 𝐼0 is falling normally on a surface. The surface absorbs 20% of the intensity and the rest is reflected. The radiation pressure on the surface is given by 𝑋𝐼0𝑐⁄, where X is ________ (up to one decimal place). Here 𝑐 is the speed of light.0 AnswerShow using a proper diagram how unpolarised light can be linearly polarised by reflection from a transparent glass surface (Physics CBSE 2018) 1 AnswerShow that the incident ray of light is parallel to the emergent ray of light then light falls obliquely on a side of a rectangular glass slab. -2008 CBSE Physic class 101 AnswerDuring the experiment, to trace the path of ray of light through the glass prism, students reported the following observations : CBSE class10 Science 20161 AnswerA hydrogen atom initially in the ground state absorbs a photon which excites it to the n = 4 level. Estimate the frequency of the photon (Physics CBSE 2018)1 AnswerConsider a two dimensional harmonic oscillator with angular frequency ωx = 2ωy = 6.5 × 1014 rad s –1 . The wavelength of x polarized light required for the excitation of a particle from its ground state to the next allowed excited state is ________× 10−6 m. (Round off to one decimal place) (Speed of light c = 3.0 × 108 m s–1 )0 AnswerA ray of monochromatic light is incident on one face of an equilateral prism at an angle equal to 3/4th of the angle of the prism(Physics CBSE 2018) 1 AnswerThe stopping potential in an experiment on photoelectric effect is 1∙5 V. What is the maximum kinetic energy of the photoelectrons emitted? Calculate in Joules.0 AnswerThe Miller effect in the context of a Common Emitter amplifier explains -gate Electronics and Communication 20171 Answer.Gate-20161 Answer Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 × 108 m/s. -CBSE Physics 1 AnswerWhen a beam of light (wavelength=450nm) originally traveling in air enters a piece of glass (index of refraction 1.50) what will happen to its frequency ?0 AnswerMention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case. cbse-class8-physics-20151 AnswerDraw graphs showing variation of photoelectric current with applied voltage for two incident radiations of equal frequency and different intensities. Mark the graph for the radiation of higher intensity. (Physics CBSE 2018)1 AnswerA Germanium sample of dimensions 1 cm × 1 cm is illuminated with a 20 mW, 600 nm laser light source as shown in the figure. The illuminated sample surface has a 100 nm of loss-less Silicon dioxide layer that reflects one-fourth of the incident light. From the remaining light, one-third of the power is reflected from the Silicon dioxide- Germanium interface, one-third is absorbed in the Germanium layer, and one-third is transmitted through the other side of the sample. If the absorption coefficient of Germanium at 600 nm is 3 × 104 cm-1 and the bandgap is 0.66 eV, the thickness of the Germanium layer, rounded off to 3 decimal places, is ______ μm.0 AnswerThe approximate model obtained by retaining only one of the above poles, which is closest to the frequency response of the original transfer function at low frequency is GATE-Instrumentation-Engineering-20141 AnswerConsider the following statements in respect of a histogram : 1. The total area of the rectangles in a histogram is equal to the total area bounded by the corresponding frequency polygon and the x-axis. 2. When class intervals are unequal in a frequency distribution, the area of the rectangle is proportional to the frequency. Which of the above statements is/are correct?0 AnswerPhases of the Moon occur because cbse-class8-physics-20151 AnswerIn a tropical cyclone over the Pacific Ocean, surface pressure at 500 km from the cyclone centre is 1000 hPa. Surface pressure at the centre is 900 hPa. Sea surface temperature and surface air temperature remain constant at 28oC and 27oC, respectively. Difference in potential temperature between 500 km and cyclone centre is __________ K. (Give the answer to two decimal places.) Take g = 9.8 m s–2, Cp = 1005 J kg–1 K–1, gas constant R = 287 J kg–1 K–10 Answer
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