Compared to the velocity of a 400 Hz sound, the velocity of a 200 Hz sound through air is
A) twice as great.
B) the same.
C) one-half as great.
D) one-fourth as great.
E) none of the above
B
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In the very first phase after the big bang, when the Universe was about a microsecond old, space was filled with____
a. high-energy photons b. protons and antiprotons c. protons, neutrons, electrons, and positrons (anti-electrons) d. electrons, and positrons (anti-electrons) e. protons, neutrons, electrons
Which of the following is true of chromatic aberration?
A) It mostly occurs in reflecting telescopes. B) It occurs when different colors are focused at slightly different distances. C) It is a natural phenomenon that occurs because of high turbulence in Earth's atmosphere. D) It is the main cause of seeing.
If there are 146 neutrons in 238U, how many neutrons are found in the nucleus of 233U?
a. 147 c. 143 b. 145 d. 141
When an electron moves in a direction opposite to the electric field, its potential increases but the potential energy decreases
Indicate whether the statement is true or false