The brightest stars in aging globular clusters will be:
A) core stars of planetary nebulae.
B) massive blue main sequence stars like Spica.
C) blue stragglers.
D) red supergiants like Betelguese and Antares.
E) blue supergiants like Rigel and Deneb.
D
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Explain the allowed values of the four quantum numbers for the hydrogen atom
What will be an ideal response?
A particle (q = ?4.0 ?C, m = 5.0 mg) moves in a uniform magnetic field with a velocity having a magnitude of 2.0 km/s and a direction that is 50° away from that of the magnetic field. The particle is observed to have an acceleration with a magnitude of 5.8 m/s2. What is the magnitude of the magnetic field?
A. 5.3 mT B. 4.9 mT C. 5.1 mT D. 4.7 mT E. 3.6 mT
Materials in which the resistivity becomes essentially zero at very low temperatures are referred to as
A) conductors. B) insulators. C) semiconductors. D) superconductors.
Two otherwise identical light waves arriving at the same point with peak matching valley undergo
a. constructive interference b. destructive interference c. polarization d. none of the above