Unpolarized light passes through a combination of two ideal polarizers. The transmission axes of the first polarizer and the second polarizer are at 30.0° to each other. What percentage of the original light gets through the combination?
A) 37.5%
B) 50%
C) 75%
D) 100%
A
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This figure shows idealized thermal radiation spectra from several stars and a human. Based on this graph, at about what wavelength does a 15,000 K star emit its most intense light?
A) about 100 nanometers B) about 1,000 nanometers C) about 20 nanometers D) about 100,000 nanometers
A ball is oscillating on an ideal spring with an amplitude of 8.3 cm and a period of 4.6 s. Write an expression for its position, x, as a function of time t, if x is equal to 8.3 cm at t = 0.0 s. Use the cosine function
What will be an ideal response?
Life will most likely be able to appear and evolve on a planet around which stage of a star's life?
A) core hydrogen-fusion B) shell helium-fusion C) core helium-fusion D) shell hydrogen-fusion
For relaxed viewing with a microscope or a telescope, the eyepiece is adjusted to place the image at
A) the near point of the eye. B) the pupil of the eye. C) the focal point of the eyepiece. D) infinity. E) the focal point of the objective lens.