Explain why stars more massive than the Sun live shorter main sequence lives than stars less massive than the Sun, despite having more fuel available for nuclear reactions
What will be an ideal response?
The main sequence lifetime of a star is its fuel supply (its mass) divided by the rate at which it uses up this fuel (its luminosity). The luminosities of main sequence stars increase dramatically with mass and this leads to shorter lifetimes. For example, a 2 solar mass star has a luminosity approximately 16 times that of the Sun, and therefore its main sequence lifetime is approximately (2/16 ) or 1/8 that of the Sun's.
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Which produces an interference pattern when directed through two suitably spaced slits?
A) light B) sound C) electrons D) all of the above E) none of the above
Object 1 has twice the mass of Object 2 . Both objects have the same kinetic energy. Which of the following statements is true?
a. Both objects can have the same magnitude of momentum. b. Object 1 has a momentum of greater magnitude than Object 2. c. The magnitude of the momentum of Object 2 is four times that of Object 1. d. All the statements are false.
What is an atmospheric window?
A. a region in the atmosphere where light can get through B. a part of the upper atmosphere with depleted ozone C. a region in the atmosphere where infrared radiation can penetrate D. a range of wavelengths of electromagnetic radiation which transmit through Earth's atmosphere
In the Bergeron process, condensation occurs on
a. ice crystals. b. dust. c. carbon dioxide. d. oxygen.