A. λ
B. Speed of sound
C. Speed of lightB.
D. h
Related Mcqs:
- 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 - A thing that emits its own light is___________________?
A. luminous
B. non-luminous
C. incandescent
D. bright - In normal state of energy the incident high energy photons will be______________?
A. Stimulated
B. Absorbed
C. Cause X-ray emission
D. Cause laser production - 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 - Gives the definition of metre in terms of wavelength of red cadmium light ___________________?
A. Newton
B. Einstein
C. Michelson
D. Galileo - Which experiment shows that wavelength of light is smaller than that of sound___________________?
A. Diffraction
B. Polarization
C. Interference
D. Reflection - The speed of stationary waves in a stretched string are independent of___________________?
A. Number of loops
B. Tension in the string
C. Point where string is plucked
D. both A and C - Electromagnetic waves travel in free space with the speed of___________________?
A. λ-rays
B. Positive rays
C. Cathode rays
D. More than sound waves - Stopping potential for a metal surface in case of photoelectric emission depends on_____________?
A. the threshold frequency for the metal surface
B. the intensity of incident light
C. the frequency of incident light and work function of the metal surface
D. all of the above - If a material object moves with speed of light its mass becomes ________________?
A. equal to its rest mass
B. double of its rest mass
C. infinite
D. zero
