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

Related Mcqs:

1. 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

2. A point source of light placed in a homogeneous medium gives rise to ___________________?

   A. a cylindrical wave front
   B. an elliptical wave front
   C. a spherical wave front
   D. a plane wave front

3. When one mirror of a Michelson Interferometer is moved a distance of 0.5 mm we observe 2000 fringes. What will be wavelength of light used ?

   A. 5000 nm
   B. 5000A
   C. 500m
   D. 2000um

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

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

5. Radiation with wavelength longer than red lights______________?

   A. ultraviolet rays
   B. X-rays
   C. infra red radiation
   D. visible radiation

6. A transmitting station emits radio waves of wavelength λ at power P. If h is Planck’s constant & c the speed of light what is the rate of emission of photons ?

   A. λ
   B. Speed of sound
   C. Speed of lightB.
   D. h

7. 2nd law of motion gives the definition of________________?

   A. force
   B. acceleration
   C. velocity
   D. both force and acceleration

8. 1st law of motion gives the definition of _________________________?

   A. inertia
   B. motion
   C. velocity
   D. force

9. In monochromatic red light a blue book will probably appear to be_________________?

   A. black
   B. purple
   C. green
   D. no scientific reasoning available

10. Light on passing through a Polaroid is ___________________?

    A. plane polarized
    B. un-polarized
    C. circularly polarized
    D. elliptically polarized