Which statement about pulsars is not thought to be true?
A) All pulsars are neutron stars, but not all neutron stars are pulsars.
B) Pulsars can form only in close binary systems.
C) A pulsar must have a very strong magnetic field and rotate quite rapidly.
D) Pulsars are kept from collapsing by neutron degeneracy pressure.
B
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What is Einstein's cosmological constant?
A) the value of the expansion rate of the universe B) the value of the acceleration of the universe C) the value that measures the strength of gravity across the universe D) the size of the cosmological horizon E) a repulsive force that counteracts gravity and was introduced to allow for a static universe
How did the discovery of pulsars by Jocelyn Bell lead to the winning of a Nobel Prize by Anthony Hewish?
What will be an ideal response?
In a swell, wavelength is constant. As a swell touches bottom, the wavelength
A) increases and velocity decreases. B) shortens and velocity decreases. C) shortens and velocity increases. D) and velocity increase.
The carbon dioxide cycle is important to Earth because it
A) helps sustain the planet's plant base. B) has been recognized by the Nobel Prize award committee. C) and the oceans are critical in moderating and regulating the Earth's temperatures. D) prevents the gradual buildup of oxygen, which would eventually lead to a combustible atmosphere.