The dying glow of the Big Bang is called the ______________
Fill in the blank(s) with correct word
cosmic microwave background
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The diagram below illustrates the radioactive decay of Potassium (40K), which has a half-life of 1.3 billion years. If a lunar rock is found that currently contains 5 grams of 40K, and it is determined that the sample contained 20 grams when it was formed, how old is the lunar rock?
a.
6.5 billion years
b.
19.5 billion years
c.
2.6 billion years
d.
3.9 billion years
e.
4.6 billion years
Potential of Point-Charges: Two 3.0 ?C charges lie on the x-axis, one at the origin and the other at 2.0 m. What is the potential (relative to infinity) due to these charges at a point at 6.0 m on the x-axis? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 11,000 V B. 9000 V C. 14,000 V D. 3400 V
When the speed of a wave depends on the wavelength (or frequency), the waves are said to exhibit diffraction
Indicate whether the statement is true or false
Venus has an unusual rotation rate because
a. it is very slow. b. it is very slow and retrograde. c. its obliquity is 90 degrees. d. it is very fast. e. it is very fast and retrograde.