Fossils of early life are very difficult to identify in very old rocks because early life
A) was very simple and microscopic in size
B) was not made of organic material that could be replaced by minerals
C) was so different to life found on Earth today that we are not capable of identifying it
D) did not leave behind any fossilized remains
A
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Briefly explain why radiation was trapped for 300,000 years during the era of nuclei, and why the cosmic background radiation broke free at the end of this era
What will be an ideal response?
A board that is 20.0 cm wide, 5.00 cm thick, and 3.00 m long has a density 350 kg/m3. The board is floating partially submerged in water of density 1000 kg/m3. What fraction of the volume of the board is above the surface of the water?
A) 0.350 B) 0.650 C) zero D) 0.200 E) The answer depends on which edge of the board is vertical.
An electromagnetic wave with a peak magnetic field component of 3.2 × 10^-7 T carries what average power per unit area? (m0 = 4p × 10^-7 T×m/A, e0 = 8.85 × 10^-12 C2/N×m2, and c = 3.00 × 10^8 m/s)
a. 12 W/m2 c. 2.7 W/m2 b. 3.0 W/m2 d. 1.3 W/m2
Radioactivity Basics: An ? particle is also known as
A. an electron. B. a positron. C. a helium nucleus. D. a high-energy photon.