In the context of the electromagnetic spectrum, which of the following types of electromagnetic radiation has the longest wavelength?
A) X-rays
B) Visible light
C) Radio waves
D) Gamma rays
C
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The constellations in which the Sun appears over the course of each year are called
a. circumpolar stars b. circumsolar stars c. the constellations of the zodiac d. the tropical constellations e. solstice stars
Which of the following statements expresses what we mean by a scientific theory?
A) a simple model that explains a wide variety of phenomena and that has survived repeated tests B) an explanation for a physical phenomenon, an explanation that hasn't been tested yet C) an educated guess
If a wave pulse is reflected from a free boundary, which of the following choices best describes what happens to the reflected pulse?
a. becomes inverted c. halved in amplitude b. remains upright d. doubled in amplitude
Suppose you have a rock that, when it solidifies, contains 1 microgram of a radioactive isotope. How much of this isotope remains after five half-lives?
a. 1/32 microgram b. none c. 1/16 microgram d. 1/8 microgram e. Cannot be determined without knowing the daughter isotope.