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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Suppose you are using the Doppler technique to look for planets around another star. What must you do?
A) Compare many spectra of an orbiting planet taken over a period of many months or years. B) Compare the brightness of the star over a period of many months or years. C) Carefully examine a single spectrum of an orbiting planet. D) Compare many spectra of the star taken over a period of many months or years.
The singularity of a black hole is where general relativity predicts the density to become infinite
Indicate whether the statement is true or false
A spaceship moving past the Earth with a speed of 0.800 c signals to the Earth with pulsed laser photons emitted at 10.0-second intervals according to the spaceship's clock. According to observers on Earth who see the flashes, the time interval they measure is
a. 13.4 s b. 16.7 s c. 12.5 s d. 9.70 s e. 6.03 s
A solid sphere, a solid cylinder, and a hoop all have the same mass and radius. Each are sent down identical inclined planes starting from rest. Their kinetic energies at the bottom of the incline are Ksphere, Kcylinder, and Khoop. Which of the following is true?
a. Ksphere > Kcylinder b. Khoop > Ksphere c. Khoop > Kcylinder d. Kcylinder > Khoop e. No answer above is correct.