When you look through a sheer curtain at a distant street lamp, you see a pattern of colored spots of light. This occurs by
a. polarization of light in scattering and partial absorption by the threads.
b. interference of light waves that pass through the threads with light waves that pass through the openings between the threads.
c. refraction of light waves differentially in the cylindrical threads.
d. diffraction of light waves passing through the two dimensional pattern of openings between the threads.
e. reflection of light waves by the sides of the threads.
d
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In general, the time it takes from when in interstellar cloud fragment first begins collapsing until it gives birth to a main-sequence star is
A) shorter for less massive stars. B) longer for less massive stars. C) about the same for all stars. D) dependent on the rotation rate of the star.
________ occurs when an electron in an atom jumps from a lower energy orbital to a higher energy orbital.
A. Acceleration B. Ionization C. Relaxation D. Excitation
How many stars that are within the Milky Way Galaxy are seen in the Hubble Deep Field image?
A) about 10 trillion B) thousands C) an infinite number D) about 100 billion E) several
A diffraction grating has 5150 lines per centimeter ruled on it
What is the angular separation between the first- and the third-order bright spots on the same side of the central maximum when the grating is illuminated by a beam of light with wavelength 633 nm?