Distinguish between a star and a planet. Which glows, or do they both glow?
What will be an ideal response?
Answer: A star is a luminous astronomical body fired by thermonuclear fusion in its core. A planet is an astronomical body smaller than a star, which is not powered by nuclear fusion in its core. All bodies with any temperature glow. Because of a star's relatively high temperature, its glow is in and beyond the visible range of frequencies, whereas the glow of a planet is in the infrared.
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Which of the following is true of O and B stars?
A) Their parallax is too small to measure. B) They are not found in associations. C) They reveal parts of six spiral arms near the Sun. D) Their distances cannot be measured by spectroscopic parallax.
A material which has the ability to rotate the direction of polarization of linearly polarized light is said to be
A) circularly polarized. B) birefringent. C) optically active. D) dichroic. E) diffraction limited.
In the Bohr model of the hydrogen atom
a. energy is quantized. b. the electron's angular momentum is quantized. c. the emission spectrum is quantized. d. the absorption spectrum is quantized. e. all of the above
The most common rocks in Earth's crust are
a. sedimentary. b. metamorphic. c. igneous. d. lava.