Diffraction Grating Experiment Quiz Sunday, December 24th, 2023 by Dr Sushil Kumar Post Reads : 7,676 Diffraction Grating Experiment: In this experiment we find the wavelength of the LASER light Please enter your email: 1. What is the condition for constructive interference? Grating should be clean and straight Path difference should be integral multiple of lembda (wavelength) path difference = n x lembda Grating should have at least two slits Light Source should be a Laser 2. Why do you use n lembda= d sin theta formula? What is the origin to derive this formula for this experiment? Constructive interference condition Destructive Interference condition Farting element condition None of these 3. How to find the grating element of a given diffraction grating having 1500 Lines Per Inch (LPI)? This is aim of the experiment by using the formula n lembda= d sin theta In one inch available lines are 15000 it means number of slits available. So one slit i.e. grating element will be=1 inch/15000 This is standard value which we can determine by the formula 4. What is the standard value of Red Color wavelength in He-Ne gas LASER? 6328 x10^{-10} meter 4526 x10^{-10} meter 3598 x10^{-10} meter 5864 x10^{-10} meter 5. What is grating Element? Grating element is the sum of slit width and opaque spacing The distance between two consecutive slits This is element by which grating is made Grating element is a device that we use in experiment for the determination of wavelength. 6. What are the Laser light characteristics ? Highly directional, low angle divergence, monochromatic,coherent, highly intense, For DJ nights, decorations, and experiments Spontaneous and stimulated emission, population inversion two energy levels, excited state life time 10^{-8} sec, remain focus 7. What is full form of the LASER? Light Amplification of Spontaneous Emission by Radiation Light Amplification of Simple Emitted Radiation Light Amplification by Stimulated Emission of Radiation Light After Source that is Emitted by Radiation 8. What is Interference? It is the interaction between two or more waves of the same or close frequencies emitted by the Coherent sources. It is an optical phenomenon, that can be seen everywhere. This occur when light distribute in random directions Interference when grating is placed in the path of laser light and light collect at a certain point. 9. What is spontaneous and stimulated emission process? In spontaneous emission, atom remain in excited state for the definite time period and after that jumps in lower energy state without any induction Spontaneous emission process is that process in which atom jumps from one state to the other along with emission and absorption of the light During the period of atomic excitation (in higher energy state of atom) one spontaneously emitted photon or incident photon interact electromagnetically with it (induce excite atom). As a result a photon emits with same nature as of the incident one. This is stimulated emission. When atom is in excited state an incident photon interact with it and as a result it get induce. This induced atom emits two photon of same frequency. 10. Step to calculate the percentage error: Determine the difference between the observed value and the standard value divided by the standard value now multiply by the 100 to change in percentage use label of % in result. Correct Wrong 11. What is population Inversion? Large number of atoms in ground state as compared to the excited state Large number of atoms in the higher energy state as compared to the lower energy state When metastable state have large enough time to hold the atoms the ground state populated more by atoms, this is called population inversion In Ruby Laser we observe the population inversion, where meta stable state get more populated as compared to the excited state 12. What is diffraction grating? A rectangular type plate of glass on which ruled very close and parallel lines. When monochromatic light falls on it light get diffracted which provides a definite pattern of light. A mirror that can diffract the laser light A device which is helpful to take the readings in this experiment. An optical instrument or device which have several parallel lines. 13. Does diffracted Waves can interfere? Yes No Never May be Loading … Question 1 of 13 Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on WhatsApp (Opens in new window)Click to email a link to a friend (Opens in new window)Like this:Like Loading... Related
