A diffraction grating has 500 lines per mm. Its slit spacing or grating element will be equal to ____________________?

Related Mcqs:

1. In double slit experiment if one of the two slit is covered then________________?

   A. no interference fringes are observed
   B. no diffraction fringes are observed
   C. no fringes observed
   D. interference pattern not disturbed

2. If a diffraction grating is placed in the path of a light beam it reveals______________?

   A. Wave property
   B. Particle property
   C. Energy particle
   D. Electromagnetic wave property

3. X-rays are diffracted by a crystal but not by a diffraction grating because_____________?

   A. The ions in a crystal are well arranged
   B. The lines in a diffraction grating cannot reflect X-rays.
   C. The penetration power of X-rays is high in a diffraction grating
   D. The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal

4. Wavelength of X-rays falling at glancing angle of 30? on a crystal with atmic spacing 2 x 10-10 for the fist order diffraction is________________?

   A. 4 x 10-10 m
   B. 2 x 10-10 m
   C. 0.02×10-10m
   D. 20×10-10m

5. In double slit experiment we observe _____________________?

   A. interference fringes only
   B. diffraction fringes only
   C. both interference and diffraction fringes
   D. polirized frringes

6. In Young double slit experiment, if white light is used____________________?

   A. alternate dark and bright fringes will be seen
   B. coloured fringes will be seen
   C. no interference fringes will be seen
   D. impossible to predict

7. Diffraction effect is____________________?

   A. more for a round edge
   B. less for a round edge
   C. more for a sharp edge
   D. less for a sharp edge

8. Diffraction fringes are____________________?

   A. equally spaced
   B. distance between them increases
   C. distance between then decreases
   D. they are adjacent with no space in between

9. The resultant of two forces of equal magnitudes is also equal to the magnitude of the forces. The angle between the two forces is________________?

   A. 30°
   B. 60°
   C. 90°
   D. 120°

10. The number of beats produced per second is equal to____________________?

    A. the sum of the frequencies of two tuning forks
    B. the difference of the frequencies of two tuning forks
    C. the ratio of the frequencies of two tuning forks
    D. the frequency of either of the two tuning forks