The cosmological redshift is actually not a velocity at all, but a measure of the expansion of space-time
Indicate whether the statement is true or false
TRUE
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Both the CNO cycle and the proton-proton fusion chain convert hydrogen to helium using catalysts
a. True b. False Indicate whether the statement is true or false
Fourier discovered that periodic waves can be represented by
A) a series of non-periodic waves. B) the summation of a series of simple sine waves. C) a binary code. D) pulses of the same amplitude.
Which of the following is a drawback of using type Ia supernovae for measuring the distance of galaxies?
A) They are not bright enough to be noticed. B) They cannot be calibrated. C) They are a rare occurrence. D) They occur only in spiral galaxies.
A light ray enters a glass enclosed fish tank. From air it enters the glass at 20.° with respect to the surface, then emerges into the water. The index for glass is 1.50 and for water 1.33
(a) What is the angle of refraction in the glass? (b) What is the angle of refraction in the water? (c) Is there any incident angle in air for which the ray will not enter the water due to total internal reflection?