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________________?

Related Mcqs:

1. 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

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. In an X-ray tube electrons each of charge e are accelerated through V potential difference allowed to hit a metal target. The wavelength of the X-rays emitted is_______________?

   A. he/ev
   B. he/Vc
   C. eV/h
   D. impossible to predict

4. The minimum wavelength of X-rays can further be reduced by _______________?

   A. Reducing the pressure or cooling the target
   B. Increasing the temperature of the filament.
   C. Using a target element of higher atomic number
   D. Increasing the potential difference between the cathode and the target

5. The minimum wavelength of X-rays produced by the bombardment of electrons on the screen of a television set where the accelerating potential is 2.0K V will be______________?

   A. 6.2 x 10-10m
   B. 9.1 x 10-18m
   C. 3.11 x 10-10m
   D. 4 x 10-10m

6. 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

7. 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

8. 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

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 shaft of a motor rotates at a constant angular speed of 360rev/min. Angle turned through in 1 sec in radian is________________?

    A. π
    B. 3π
    C. 6π
    D. 12π