Hot gas created during the big bang should be detectable becausethe ____
a. gas has traveled with galaxies as they formed and is spread through the Universe of the present day
b. big bang occurred everywhere at once, and should be visible in any direction at long look-back times
c. big bang occurred in a certain location, and the radiation from the gas is concentrated there
d. gas has travelled to the edges of the Universe and will be visible at negative redshifts
e. radiation emitted by the gas has travelled at the same speed as the expanding Universe and is visible all around us
b
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If the interplanar spacing of NaCl is 2.814 × 10^-10 m, what is the predicted angle at which X-rays of wavelength 0.140 nm will be diffracted in a first-order maximum?
a. 31.3° b. 7.20° c. 20.5° d. 14.4° e. 29.8°
Protostars are difficult to observe because
a. the protostar stage is very short.
b. they are surrounded by cocoons of gas and dust.
c. they radiate mainly in the infrared.
d. the protostar stage is very short, they are surrounded by cocoons of gas and dust, and they radiate mainly in the infrared.
e. they are all so far away that the light hasn't reached us yet.
Two equal positive charges are separated by d. Then one of the charges is replaced by a negative charge of the same magnitude. Take the potential at infinity to be zero. In which situation is the potential higher midway between the charges; is this value of potential zero?
a. the first situation; no c. the second situation; no b. the first situation; yes d. the second situation; yes
A heavy weight is supported by two cables that exert tensions of magnitude
and 
. Which statement is correct?
?
?
a..
b.
c.
d.
e.
We need the mass of the box in order to determine the correct answer.