If a sunspot has a temperature of 4,500 K and the surrounding solar surface has a temperature of 5,800 K, how many times brighter is the surface compared to the sunspot?
a. 0.28
b. 0.36
c. 2.8
d. 3.6
e. 36
C
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Chondritic meteorites provide important clues because they are believed to
A. contain grains from the first material that condensed out of the Solar nebula. B. be the only source of the necessary amino acids required for life. C. be the source of all coal found on Earth. D. contain many rare metals.
Type I supernovae can be used to determine distances to galaxies much better than type II supernovae
Indicate whether the statement is true or false
The radiation curve for a blue hot star peaks in the
A) infrared region. B) red region. C) yellow region. D) ultraviolet region. E) none of the above
A car approaches you at a constant speed, sounding its horn, and you hear a frequency of 76 Hz
After the car goes by, you hear a frequency of 65 Hz. What is the frequency of the sound emitted by the horn? The speed of sound in the air is 343 m/s. A) 68 Hz B) 69 Hz C) 70 Hz D) 71 Hz E) 72 Hz