In A.D. 1054, Chinese astronomers observed the appearance of a new star, whose location is now occupied by
a. a globular cluster.
b. a planetary nebulae.
c. a white dwarf.
d. a young massive star.
e. a supernova remnant.
e
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In an n-type semiconductor, the conduction-band energy is 1.1 eV and the donor energy level is 1.0 eV. At temperatures approaching 0 K the Fermi energy is equal to:
(a) 1.1 eV (b) 1.0 eV (c) 1.05 eV (d) 0.55 eV
Which of the following luminosity classes refers to stars on the main sequence?
A) I B) II C) III D) IV E) V
What conditions are required for a solar eclipse?
a) the phase of the Moon must be new, and the nodes of the Moon's orbit must be nearly aligned with the earth and the Sun b)the phase of the Moon must be full, and the nodes of Moon's orbit must be nearly aligned with the earth and the Sun c)the phase of the Moon must third quarter, and the Moon's orbital plane must lie in the plane of the ecliptic
Discuss why it is impossible for a particle to decay into a single particle of less mass
What will be an ideal response?