When discussing stellar lives, astronomers divide stars by mass into low-mass stars (masses similar to the Sun or lower) and high-mass stars (masses more than about 8 times that of our Sun). Which category includes stars that die in supernova explosions?

A) high-mass stars only
B) low-mass stars only
C) They both die in supernova explosions.
D) Neither: Supernovas only occur in binary star systems.


A) high-mass stars only

Physics & Space Science

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Answer the following statement true (T) or false (F)

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Mercury and the Moon are probably the least-habitable bodies in the solar system because they

A) are unlikely to have liquids anywhere B) have never had carbon compounds on their surfaces C) do not have atmospheres containing oxygen D) do not receive any sunlight

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The average adult radiates heat energy at the same rate as

a. a 10-W light bulb. b. a 100-kW light bulb. c. a 100-W light bulb. d. none of these.

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An ambulance is generating a siren sound at a frequency of 2,400 Hz. The velocity of sound is 345.0 m/s. If the ambulance is traveling at a velocity of 24.00 m/s away from the stationary observer, then what is the frequency of the siren perceived by the observer?

A. 2,375 Hz B. 2,306 Hz C. 2,266 Hz D. 2,244 Hz E. 2,210 Hz

Physics & Space Science