Diffraction Grating Experiment Quiz

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To determine the He-Ne gas LASER wavelength we use grating element. Which have 15000 lines per inch or it may very from laboratory to the laboratory.

Diffraction Grating Experiment Quiz, it will help you to make your concept more clear about the experiment. Experiment means not taking the reading and calculations or complete the practical file it means understanding of the concepts used in that experiment.

Attempt the quiz and check what you had missed to learn from this experiment.

Diffraction Grating Experiment: In this experiment we find the wavelength of the LASER light

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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. 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.

3. 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

4. Does diffracted Waves can interfere?

Yes

Never

May be

5. 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

6. 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

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 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

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. 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

11. 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.

12. 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.

13. 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

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