The rotation curve of a galaxy is important in determining the galaxy's ____
a. mass
b. age
c. luminosity
d. type
e. diameter
a
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The numbers of sunspots and their activity peak about every
A) 36 days. B) six months. C) year. D) eleven years. E) 76 years.
A conclusion that follows from E=mc2 is that, at the microscopic level,
A) matter is made of force fields. B) tiny indestructible pieces of matter move through empty space. C) there is only matter and antimatter. D) all matter must vibrate at the speed of light. E) matter is made of radiation.
A compound microscope has an eyepiece that
a. uses a real image from the objective as the object and forms its own real image. b. uses a real image from the objective as the object and forms a virtual image. c. uses a virtual image from the objective as the object and forms its own real image. d. uses a virtual image from the objective as the object and forms its own virtual image.
The index of refraction of a type of glass is 1.50, and the index of refraction of water is 1.33. If light enters water from this glass, the angle of refraction will be
A) greater than the angle of incidence. B) equal to the angle of incidence. C) less than the angle of incidence.