What is the most accurate way to determine the distance to a relatively nearby star (within the Milky Way)?
A) radar ranging
B) stellar parallax
C) using Cepheid variables
D) using white dwarf supernovae
E) applying Hubble's law
B) stellar parallax
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What happens to the core of a star if gravity is strong enough to overcome neutron degeneracy pressure?
A) The core contracts and becomes a white dwarf. B) The core contracts and becomes a ball of neutrons. C) The core contracts and becomes a black hole. D) The star explodes violently, leaving nothing behind. E) Gravity is not able to overcome neutron degeneracy pressure.
You see colors in a rainbow because of diffraction
a. True b. False Indicate whether the statement is true or false
Who discovered the electron in 1897?
a. Ernest Rutherford b. James Chadwick c. J. J. Thomson d. Niels Bohr
The ozone layer absorbs infrared radiation from sunlight
Indicate whether the statement is true or false