Three stars in a constellation, alpha, beta, and gamma, have temperature of 4,000K (alpha), 16,000K (beta), and 9,000K (gamma). Which of the following sequences is correctly sorted from reddest to bluest colors?
a) alpha, gamma, beta
b) gamma, beta, alpha
c) beta, alpha, gamma
d) alpha, beta, gamma
e) beta, gamma, alpha
Which of the following lists types of light are correctly sorted from longest to shortest wavelength?
a) Microwaves, ultraviolet, infrared
b) Optical, infrared, ultraviolet
c) Radio, gamma-rays, X-rays
d) X-rays, optical, ultraviolet
e) Radio, infrared, X-rays
A black hole ejects jets which show emission lines blue-shifted from 500nm to 450nm. How fast in the jet moving?
a) 1x10^8 m/s towards us (100,000,000 m/s
b) 3x10^7 m/s towards us (30,000,000 m/s)
c) 1x10^7 m/s away from us (10,000,000 m/s)
d) 3x10^8 m/s away from us (300,000,000 m/s
e) 3x10^6 m/s towards us (3,000,000 m/s)
Three stars close together in a cluster, labelled A, B, and C, have temperatures of 17,200 K (A), 5,600 K (B), and 4,200 K (C). If they all have the same size, which of the following sequences correctly sorts them from least faintest to brightest?
a) C, B, A
b) C, A, B
c) A, C, B
d) B, A, C
e) A, B, C