Which of the following is true about protons and neutrons?
A) They have exactly the same mass.
B) They have exactly the same charge.
C) They are composed of the same number of quarks.
D) They are fundamental particles that cannot be broken into smaller particles.
E) They are leptons.
C) They are composed of the same number of quarks.
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The cosmological principle states that any observer in any galaxy will see the same general features of the universe
Indicate whether the statement is true or false
One of the lines of Hydrogen has a wavelength of 121.6 nm. If a cloud of Hydrogen gasis moving TOWARDS us at 200km/s, what will we detect?
a) An emission line in the cloud's spectrum with a wavelength shorter than 121.6 nm. b) An emission line in the cloud's spectrum with a wavelength longer than121.6 nm. c) An emission line in the cloud's spectrum with a wavelength of exactly 121.6 nm. d) This cloud will not emit a spectrum at all. e) A continuous spectrum with an absorption line at exactly 121.6 nm.
In A.D. 1054, Chinese astronomers observed the appearance of a new star, whose location is now occupied by
a. a pulsar. b. a neutron star. c. a supernova remnant. d. all of the above
On a cold day, a heat pump absorbs heat from the outside air at 14°F (?10°C) and transfers it into a home at a temperature of 86°F (30°C). Determine the maximum ? of the heat pump
a. 0.2 b. 4.4 c. 0.5 d. 7.6 e. 6.7