Product of wavelength and time period is _______________?

Related Mcqs:

1. 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

2. Gives the definition of metre in terms of wavelength of red cadmium light ___________________?

   A. Newton
   B. Einstein
   C. Michelson
   D. Galileo

3. Which experiment shows that wavelength of light is smaller than that of sound___________________?

   A. Diffraction
   B. Polarization
   C. Interference
   D. Reflection

4. As the temperature of black body is raised the wavelength corresponding to maximum intensity________________?

   A. shifts towards longer wavelength
   B. shifts towards shorter wavelength
   C. remain the same
   D. shifts towards longer as well as shorter wavelengths

5. In Compton scattering, the change in wavelength is maxed if_______________?

   A. The angle of scattering is 90°
   B. The angle of scattering is 60°
   C. The angle of scattering is 180°
   D. The angle of scattering is 0

6. In a photoelectric effect monochromatic light is incident on a metal surface. If the incident light of twice the intensity but of same wavelength the kinetic energy of the emitted electron_______________?

   A. Becomes double
   B. Remains same
   C. Becomes half
   D. First increases then decrease because of the curvilinear graph

7. If the wavelength of incident radiation is increased in photoemission then_________________?

   A. The maximum kinetic energy of the photoelectrons increases
   B. The minimum kinetic energy of the photoelectrons decreases
   C. The minimum kinetic energy of the photoelectrons increases
   D. The average kinetic energy of the photoelectrons decreases

8. The velocity of a particle of mass m of de-Broglie wavelength λ is______________?

   A. v = 3 ×× 106 ms-1
   B. v = 2 ×× 10 ms-1
   C. v = 2 ×× 6 ms-1
   D. v = 2 ×× 106 ms-1

9. 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

10. What is wavelength of visible spectrum?

    A. 8500 – 9800 angstrom
    B. 7800 – 8000 angstrom
    C. 3900 – 7600 angstrom
    D. 1300 – 3000 angstrom

    Submitted by: Engr Allah Wadhayo