Diffraction effect is____________________?

Related Mcqs:

1. 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

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

   A. 500 mm
   B. 5 x 10-3 mm
   C. 2 x 10-5 mm
   D. 2 x 10-3 mm

3. 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

4. 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

5. 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

6. The escape velocity form the earth surface in km S-1 is____________________?

   A. 4.2 km S-1
   B. 7.5 km S-1
   C. 9.5 km S-1
   D. 1.1 km S-1

7. The source of tidal energy is____________________?

   A. sun
   B. earth
   C. both A and B
   D. moon

8. Propulsion force of a rocket is____________________?

   A. non-conservative force
   B. conservative force
   C. both A and B
   D. none of these

9. A wire is stretched by a force F which causes an extension 1. The energy stored in the wire is____________________?

   A. The extension of the wire is proportional to the force applied
   B. The weight of the wire is negligible
   C. The wire is not stretched beyond its elastic limit
   D. The cross sectional area of the wire remains constant

10. A wire obeys Hooks law is of length 11 when it is in equilibrium under a tension F1. Its length becomes 12 when the tension is increased to F2. The energy stored in the wire during this process is____________________?

    A. (F1+F2) (121+122)
    B. (F1+F2) (122-112)
    C. (F1+F2) (12-11)
    D. (F1+F2) (12-11)