For a white dwarf to explode entirely as a Type I supernova, its mass must be
A) at least 0.08 solar masses.
B) 1.4 solar masses, the Chandrasekhar limit.
C) 3 solar masses, the Schwartzschild limit.
D) 20 solar masses, the Hubble limit.
E) 100 solar masses, the most massive known stars.
B
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A telescope has an angular magnification of 250. when operated with a 20. mm eyepiece. What is the focal length of the objective?
A) 5.0 cm B) 25. meters C) 5000. cm D) 5.0 meters E) 2.5 m
A photocathode that has a work function of 2.4 eV is illuminated with monochromatic light having photon energy 3.5 eV. What is the wavelength of this light? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 350 nm B) 330 nm C) 300 nm D) 380 nm E) 410 nm
The Orion Nebula, M-42, is a hot, thin cloud of glowing gas, so its spectrum is:
A) a continuum, strongest in the color red. B) a few bright lines against a dark background. C) a few dark lines in the continuum. D) a continuum, but with both bright and dark lines mixed in. E) not in the visible portion of the spectrum.
Red giant stars are
A) close to exhausting their supply of hydrogen. B) have already exhausted their supply of hydrogen. C) are close to exhausting their supply of helium. D) have already exhausted their supply of helium.