What are the standard candles used to determine that the universe is accelerating?
A: spiral galaxies
B: elliptical galaxies
C: Type Ia supernovae
D: light bulbs
E: Type II supernovae formed from the death of massive stars
Ans: C: Type Ia supernovae
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A conducting rod slides at 3.0 m/s on metal rails separated by 2.0 m. The 0.66 m T magnetic field is into the paper. If the resistance is 220 m
what is the current in the circuit?
A. 18 mA
B. 9.0 mA
C. 87
A
D. 3.0
A
E. 4.5 mA
When a comet passes near the Sun, part of it takes on the appearance of a large, bright ball from which the tail extends. This part is called the
A) coma. B) nucleus. C) plasma tail. D) Oort core.
Gamma rays are photons with very high energy. What is the wavelength of a gamma-ray photon with energy 7.7 × 10-13 J? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 3.1 × 10-13 m B) 3.5 × 10-13 m C) 3.9 × 10-13 m D) 2.6 × 10-13 m
When a central dark fringe is observed in reflection in a circular interference pattern, waves reflected from the upper and lower surfaces of the medium must have a phase difference, in radians, of
a. 0. b. p/2. c. p. d. 3p/2. e. 2p.