Search & Filtering
In what ways do photons resemble other particles such as electrons? In what ways do they differ? Do photons have mass? Do they have electric charge? Can they be accelerated? What mechanical properties do they have?
Some loudspeaker horns for outdoor concerts (at which the entire audience is seated on
the ground) are wider vertically than horizontally. Use diffraction ideas to explain why this is more efficient at spreading the sound uniformly over the audience than either a square speaker horn or a horn that is wider horizontally than vertically. Would this still be the case if the audience were seated at different elevations, as in an amphitheater? Why or why not?
Light of wavelength and frequency f passes through a single slit of width a. The diffraction
pattern is observed on a screen a distance x from the slit. Which of the following will decrease the width of the central maximum? (a) Decrease the slit width; (b) decrease the frequency f of the light; (c) decrease the wavelength l of the light; (d) decrease the distance x of the screen from the slit. In each case, justify your answer.
When a thin oil film spreads out on a puddle of water, the thinnest part of the film looks dark in the resulting interference pattern. What does this tell you about the relative magnitudes of the refractive indexes of oil and water?
Would the headlights of a distant car form a two-source interference pattern? If so, how
might it be observed? If not, why not?
Monochromatic coherent light passing through two thin slits is viewed on a distant screen. Are the bright fringes equally spaced on the screen? If so, why? If not, which ones are
closest to being equally spaced?
A two-slit interference experiment is set up, and the fringes are displayed on a screen.
Then the whole apparatus is immersed in the nearest swimming pool. How does the fringe pattern change?
Polarizer and analyzer are set with their polarizing directions parallel so that the intensity of transmitted light is maximum. Through what angle should either be turned so that the intensity is reduced to 80 % of the maximum intensity?
Which is a more precise measuring tool : ruler or Vernier Caliper? Why?
A boy stands 42.35 m in front of a flat mirror, how far away from him will his image be in the mirror?
