Classify the following experimental results according to the following scheme: F
ID: 1659270 • Letter: C
Question
Classify the following experimental results according to the following scheme:
For the quantons in question, the results:
A. Are consistent with a pure wave model.
B. Are consistent with a pure particle model.
C. Are consistent with either model (the results do not distinguish between models).
D. Cannot be explained by either model alone.
(a) When light goes through a slit, the beam broadens somewhat, and if it is projected on a screen, one can see bright and dark fringes on the slit image.
(b) When light shines on a metal surface, electrons are ejected from the surface.
(c) The number of electrons ejected from a metal surface depends directly on the intensity of the light shining on that metal surface.
(d) The maximum kinetic energy of electrons ejected from a metal surface depends on the frequency of the light shining on the surface, and not on the intensity.
(e) When light shines on a surface, at least a few electrons seem to get ejected virtually as soon as the surface is illuminated, even if the light is extremely dim.
(f) An electron beam shining on a nickel crystal is preferentially reflected in certain directions instead of being scattered uniformly in all directions.
(g) Light that goes through two narrow, closely spaced slits in an opaque barrier and then falls on a screen creates a pattern of multiple bright spots on the screen.
(h) When dim light falls on a photomultiplier, the latter produces discrete electric pulses at random times.
(i) A rapidly moving electron leaves a track in a bubble chamber photograph.
(j) Photons sent one at a time through two slits appear individually to hit a detector array at random positions, but statistically fall into a two-slit interference pattern.
Explanation / Answer
1) This phenomenon is interference of light waves. Due to which change in amplitude of resulting wave occurs. It is purely wave nature of light.
2) it is photoelectric effect. Light is a beam of photons, so when photons if energy greater than particular value called work function of metal, then electrons are ejected from the surface of metal. One photon is responsible for ejection of one electron. This is particle behaviour of light.
3) As intensity of light means no. Of photons falling per second, so no. Of electron ejected from metal surface depend upon the intensity of light. It is particle nature of light.
4) Kinetic energy of photoelectron is related to energy of one photon. We know energy of photon is purely depend s on frequency of light falling. It is particle or wave duality.
6) An electron beam is preferentially reflected in particular direction from Nickel crystal. It is polarisation of light wave. It is wave nature of light.
7) It is interference and diffraction of waves from narrow small opening, wave nature of light.