The electron
a. is an absolutely stable particle. b. decays via the weak interaction.
c. has zero mass. d. is a lepton.
a, d
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Solenoid: An ideal solenoid with 400 turns has a radius of 0.040 m and is 40 cm long. If this solenoid carries a current of 12 A, what is the magnitude of the magnetic field at the center of the solenoid? (?0 = 4? × 10-7 T ? m/A)
A. 16 mT B. 4.9 mT C. 15 mT D. 6.0 mT E. 9.0 mT
Which of the following statements about spectral types of stars is not generally true?
A) The spectral type of a star can be used to determine its distance. B) The spectral type of a star can be used to determine its surface temperature. C) The spectral type of a star can be used to determine its color. D) The spectral type of a star can be determined by identifying lines in the star's spectrum.
Most stars radiate much like black bodies. Consider two stars having the same surface temperature, the second having 10 times the diameter of the first. The power radiated per unit area is
A) 102 times larger for the 2nd. B) 10 times larger for the 2nd. C) the same for both. D) 104 times larger for the 2nd. E) 108 times larger for the 2nd.
what are the products of helium burning in a star?
What will be an ideal response?