You can only see a rainbow if
A) the sun is behind you.
B) the sun is in front of you.
C) the sun is 90° to the side.
D) the sun is 180° to the side.
A
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About how many galaxies are there in the observable universe?
A) roughly (within about a factor of 10) the same as the number of stars in our galaxy B) a few dozen C) a few thousand D) about as many as the number of grains of sand on all the beaches on Earth E) an infinite number
Which part of the electromagnetic spectrum generally gives us our best views of stars forming in dusty clouds?
A) infrared B) visible light C) ultraviolet D) blue light
A Carbon-14 nucleus decays to a Nitrogen-14 nucleus by beta decay. How much energy (in MeV) is released if Carbon-14 has a mass of 14.003074 u and Nitrogen-14 has a mass of 14.003242 u?
What will be an ideal response?
According to kinetic theory, a typical gas molecule in thermal equilibrium at room temperature has a kinetic energy K = 6.00 × 10^?21 J, regardless of mass. Estimate the speed at room temperature of a hydrogen molecule H2 (m = 3.34 × 10^?27 kg) and a xenon atom (m = 2.00 × 10^?25 kg). [kB = 1.38 × 10^?23 J/K]