All massive-star supernovae leave behind black holes as remnants
Indicate whether the statement is true or false
FALSE
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Which of these strongly relate to a piano string?
A) mass B) length C) pitch D) all of the above E) none of the above
Which of the following makes it very difficult to detect planets around other stars?
A) Planets are constantly orbiting their stars, so we don't know where to point our telescopes to see them. B) Planets are typically at least a billion times fainter than their host stars. C) Planets give off only infrared light, not visible light. D) Planets orbit too far from their stars to be detected.
Water pressure on a submerged object is greatest against its
A) top. B) bottom. C) sides. D) same against all surfaces E) none of the above
The magnetic field of a plane-polarized electromagnetic wave moving in the z-direction is given by 
in SI units. What is the wavelength of the EM wave?
A. 120 m B. 240 m C. 60 m D. 100 m E. 360 m