Suppose an elliptical galaxy is so far away that we cannot see even its brightest stars individually. Which of the following techniques might allow us to measure its distance?
A) We could use parallax.
B) We could use Cepheid variables as standard candles.
C) We could use a white dwarf supernova as a standard candle.
D) We could use radar ranging.
C
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In the most general form of the first law of diffusion, the gradient of the Gibbs free energy with respect to the position of B-type atoms is equal to the chemical _____________on the B-type atoms.
Fill in the blank(s) with the appropriate word(s).
Emission nebulae are created by gas absorbing ultraviolet energy from the hot young stars within them, such as in the Orion Nebula
Indicate whether the statement is true or false
The color force is carried by gluons but gluons do not have color charge themselves
a. True b. False Indicate whether the statement is true or false
Calculate the energy En, in electron volts, of a hydrogen atom's electron with n = 5