What is wavelength of visible spectrum?

Related Mcqs:

1. If we look at the floating piece of iceberg on the sea, approximately what fraction of it is visible above the seawater level?

   A. 1/6th
   B. 1/8th
   C. 1/10th
   D. None of these

   Submitted by: Nayab Idrees

2. In hydrogen spectrum which one of the following series lies in the ultraviolet region ?

   A. Balmer series
   B. Pfund series
   C. Bracket series
   D. Lymann series

3. Total number of series in hydrogen spectrum is_____________?

   A. three
   B. four
   C. five
   D. six

4. The characteristic X-rays spectrum is due to_____________?

   A. The illumination of the target metal by ultra-violet radiation
   B. The bombardment of the target by protons
   C. The bombardment of target by electrons
   D. The absorption of radiation by the target metal

5. Maximum frequency in the spectrum from X-ray tube is directly proportional to the______________?

   A. Number of incident electron i.e. filament current
   B. The kinetic energy of the incident electron i.e. the potential difference through which they are accelerated
   C. The soft target which can easily emit electrons
   D. All of above are correct

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

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

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

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

8. 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

9. 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

10. 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