A change of phase takes place at a constant
a. temperature.
b. volume.
c. heat.
d. pressure.
a
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Suppose that we have a sample of 20 atoms of radioactive potassium which decays by half every 1.3 billion years into calcium and argon at ratios of 9:1, respectively. How many atoms of calcium do you expect to find in this sample after 1.3 billion years?
A. 9 B. 18 C. 1 D. 2
Most astronomers agree to interpret ________ Law to mean that the present day universe is expanding
Fill in the blank(s) with correct word
If the voltage amplitude across an 8.50-nF capacitor is equal to 12.0 V when the current amplitude through it is 3.33 mA, the frequency is closest to
A) 32.6 MHz. B) 5.20 MHz. C) 32.6 kHz. D) 5.20 kHz. E) 32.6 Hz.
Point charges q and Q are positioned as shown. If q = +2.0 nC, Q = ?2.0 nC, a = 3.0 m, and b = 4.0 m, what is the electric potential difference, VA?VB?
A. 8.4 V B. 6.0 V C. 7.2 V D. 4.8 V E. 0 V