The critical angle is that angle of incidence for which the angle of refraction equals ______
Fill in the blank(s) with correct word
90 degrees
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The type of galaxy where we can track its motion through the intergalactic medium is a:
A) blazar. B) quasar. C) pulsar. D) Head-Tail Radio Galaxy. E) Seyfert galaxy.
A 5.0-liter gas tank holds 1.4 moles of helium (He) and 0.70 moles of oxygen (O2), at a temperature of 260 K. The atomic masses of helium and oxygen are 4.0 g/mol and 16.0 g/mol, respectively
Avogadro's number is 6.022 × 1023 molecules/mol and the Boltzmann constant is 1.38 × 10-23 J/K. The total random translational kinetic energy of the gas in the tank is closest to A) 7.6 kJ. B) 6.8 kJ. C) 8.3 kJ. D) 6.1 kJ. E) 9.1 kJ.
How is the age of the galaxy determined?
a. measuring the metallicity of Population II stars b. finding the turnoff point in the H-R diagram of globular clusters c. from the motion of stars in the galactic halo d. counting the number of open clusters in the spiral arms
Find the equation 
that fits the following data.
A. 
B. 
C. 
D. 