Earth and Venus are often called sister planets; in which ways are they most alike?
A) atmospheric composition and density
B) size, density, and surface gravity
C) surface temperature and pressure
D) cloud composition and meteorology
E) polar caps and rusty red deserts
B
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Spiral and irregular galaxies have active star formation
a. True b. False Indicate whether the statement is true or false
Why do higher-mass stars live shorter lives on the main sequence than lower-mass stars?
a. Higher-mass stars burn through their nuclear fuel faster. b. Lower-mass stars don't get their energy from that same nuclear fusion source as higher-mass stars. c. Higher-mass stars have less hydrogen fuel to burn. d. Lower-mass stars spend a longer time evolving to the main sequence. e. All of the other choices are false.
A far-sighted student has a near point of 1.0 m. Calculate the focal length (in cm) of the glasses needed so the near point will be normal (25 cm).
A. 72 B. 25 C. 33 D. 100 E. ?33
Which of the following statements are true about light waves?
a)The higher the frequency, the longer the wavelength. b)The lower the frequency, the longer the wavelength. c)Higher-frequency light travels faster than lower-frequency light. d)The shorter the wavelength, the higher the frequency. e)The lower the frequency, the shorter the wavelength.