When the intensity of the light is increased in a photoelectric effect experiment, the energy of the emitted electrons
a. increases.
b. decreases.
c. stays the same.
d. becomes more quantized.
e. becomes less quantized.
c
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Consider the five facts listed below. The nebular theory of the formation of the solar system successfully accounts for four of these facts, while one can be considered to be just a coincidence. Which fact is a coincidence?
A) Our solar system has an equal number of terrestrial and jovian planets. B) The planets all orbit around the Sun in nearly circular orbits in nearly the same plane. C) The planets divide into two major types, terrestrial and jovian. D) The solar system has many small bodies, and these are concentrated in the regions known as the asteroid belt, Kuiper belt, and the Oort cloud. E) There are many impact craters on the Moon.
If the universe is flat
a. its age will be equal to 1/H. b. its age will be equal two-thirds of 1/H. c. the density of the universe is less than the critical density. d. the density of the universe is greater than the critical density. e. dark matter accounts for a small fraction of the density of the universe.
A negative magnification for a mirror means that
A) the image is inverted, and the mirror is convex. B) the image is upright, and the mirror is convex. C) the image is inverted, and the mirror could be either concave or convex. D) the image is upright, and the mirror could be either concave or convex. E) the image is inverted, and the mirror is concave.
On average, how often do impactors about 10 km in size, large enough to produce mass extinction, hit Earth?
A) once every century B) once every thousand years C) once every million years D) once every hundred million years E) once in Earth's history