Arno Penzias and Robert Wilson are famous for____
a. creating the first microwave telescope
b. finding the direction of the center of the Universe
c. detecting energy released in the splitting of the electroweak force
d. detecting the large redshift background radiation from the big bang
e. measuring the temperature of the big bang
d
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A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up-and-down motion.The acceleration
a. is zero. b. has its largest magnitude. c. points up. d. points down.
A beam of light is polarized in a vertical plane and has an intensity I0. The beam passes through an ideal polarizer and then through an ideal analyzer whose axis is set horizontally
If the axis of the polarizer is set at 60° with the vertical, what is the ratio of the intensity of the final beam to I0? A) 0.19 B) 0.25 C) 0.31 D) 0.37 E) 0.43
Do you think that this experiment confirms the validity of the series resistor equation used in Procedures 2(f), 3(f), and 4(f)?
Increases in the temperature of the earth due to the greenhouse effect over the last 50 years is least due to ________
a. burning of oil by industry and utilities b. flatulence by cows c. addition of hot water to lakes by utilities d. clearing land for farming e. use of freons