Which of the following statements is true?
A. Low-mass stars cannot produce neon.
B. Low-mass stars can fuse heavier elements by the triple-alpha process and neutron capture.
C. Planetary nebulae are an important source of interstellar carbon and nitrogen.
D. All of these choices are correct.
Answer: D
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A 5.0-kg object is pulled along a horizontal surface at a constant speed by a 15-N force acting 20° above the horizontal. How much work is done by this force as the object moves 6.0 m?
a. 78 J b. 82 J c. 85 J d. 74 J e. 43 J
Which of the following particles has not yet been detected (even though most scientists consider its existence to be likely)?
a. The pion. b. The muon. c. The graviton. d. Intermediate vector bosons. e. The positron.
What is the wavelength of the photon emitted when an electron in a hydrogen atom which is in the initial state ni = 8 jumps to the final state nf = 2?
A) 205.1 nm B) 104.0 nm C) 388.8 nm D) 486.2 nm E) 610.0 nm
Space itself is expanding
Indicate whether the statement is true or false