Explain why an absorption line spectrum is not filled back in (to make the original continuous spectrum) by the photons that are emitted as the excited electrons decay back down to their original energy levels
What will be an ideal response?
The photons emitted by the decays are emitted in random directions. Hence only a fraction of them are sent back in their original direction towards us.
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Scattered light in the atmosphere is often partially polarized. The best way to determine whether or not light from a particular direction in the sky shows polarization is to
A. diffract the light through a single slit. B. squint while looking in that direction. C. rotate a piece of polaroid film about an axis parallel to the ray while looking through it in that sky direction. D. rotate a piece of polaroid film about an axis perpendicular to the ray while looking through it in that sky direction. E. reflect the rays from that direction on a shiny metal surface.
Liquid crystal displays make use of
a. interference b. diffraction c. specular reflection d. diffuse reflection e. polarization
A 66-kg woman runs up a flight of stairs having a rise of 4.0 m in a time of 4.2 s. What average power did she supply?
a. 380 W c. 620 W b. 560 W d. 670 W
Which of the following is a planet that is visible to the naked eye from Earth?
A) Saturn B) Uranus C) Neptune D) Keplar 10b