What is the surface temperature of a star, if its radiation peak occurs at a frequency of 1.06 × 1015 Hz? (c = 3.00 × 108 m/s, and the constant in Wien's law is 0.00290 m ? K)

A) 17,000 K
B) 14,500 K
C) 19,000 K
D) 20,400 K
E) 10,200 K


E

Physics & Space Science

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Earth is a noninertial reference system:

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A pair of parallel conducting plates have potentials of -17 V and 55 V, respectively. An electron is ejected from the plate at potential -17 V and travels to the plate at 55 V. What is the speed of the electron as it strikes the 55 V plate, assuming it left the -17 V plate from rest? The mass of the electron is 9.11 x kg.

a.
b.
c.
d.

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As the Universe cooled, it eventually reached a temperature of 3,000 K and protons were able to capture and hold electrons to form neutral hydrogen. This process is known as

a. ionization. b. isotropy. c. annihilation. d. recombination. e. hydration.

Physics & Space Science