Gamma rays are photons with very high energy. How many visible-light photons with a wavelength of 500 nm would you need to equal the energy of a gamma-ray photon with energy
A) 1.0 × 106
B) 1.4 × 108
C) 6.2 × 109
D) 3.9 × 103
A
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In a mass-energy census of the universe, what are the approximate proportions of normal matter, dark matter, and dark energy?
A) 68% dark matter, 27% dark energy, 5% normal matter B) mostly normal matter, with only trace amounts of dark matter and dark energy C) 27% dark matter, 68% dark energy, 5% normal matter D) 33% dark matter, 33% dark energy, 33% normal matter
Unpolarized light of intensity Io passed through a Polaroid sheet with its polarizing axis at the 12 o'clock position and then through a second with its polarizing axis at the 1 o'clock position. What is the intensity of the emerging light?
What will be an ideal response?
What is ?min for a monochromatic beam of light of wavelength 600 nm and an aperture diameter of 6.00 mm?
A) 100 × 10-6 rad B) 202 × 10-6 rad C) 122 × 10-6 rad D) 244 × 10-6 rad E) 236 × 10-6 rad
Halley's Comet is in a highly elliptical orbit around the sun. Therefore the orbital speed of Halley's Comet, while traveling around the sun,
A) is constant. B) increases as it nears the Sun. C) decreases as it nears the Sun. D) is zero at two points in the orbit.