A sinusoidal standing sound wave inside a tube that is open at both ends must fit between the tube’s ends
A. An integer number of wavelengths.
B. An integer number of half-wavelengths.
C. An integer number of quarter-wavelengths
D. An odd-integer number of half-wavelengths.
E. An odd-integer number of quarter-wavelengths
B. An integer number of half-wavelengths.
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There is a main sequence mass-luminosity relation because
a. helium fusion produces carbon. b. stars expand when they become giants. c. more massive stars support their larger weight by making more energy. d. the helium flash occurs in degenerate matter. e. all stars on the main sequence have about the same radius.
This diagram shows a person on a planet watching you travel to the right at 0.9c, while you have a flashlight turned on with the light shining to the right. Which of the following statements is not true from your point of view?
A) If you can increase your speed by another 0.1c, you'll be able to keep up with the flashlight beam. B) The person and planet are moving to your left at 0.9c. C) Time is running slow for the person on the planet. D) The light from the flashlight beam is moving to the right at the speed of light c.
The basic force that binds materials together is:
a. gravitational force. b. nuclear force. c. buoyant force. d. inertial force. e. electrical attraction.
A planetary nebula has a radius of 0.5 pc and is expanding at 20 km/s. What is the approximate age of this planetary nebula? (1 pc is equal to 3×10^13 km and 1 year is equal to 3.15×10^7 seconds.)
a. 240 years b. 790,000 years c. 96,000 years d. 960 years e. 24,000 years