According to the Big Bang model, most of the ________ in the Universe were formed ________.
A. hydrogen and helium; in the interior of massive stars
B. hydrogen and helium; during supernova explosions
C. heavy elements; during the first 3 minutes
D. hydrogen and helium; during the first 3 minutes
Answer: D
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An ideal solenoid 20 cm long is wound with 5000 turns of very thin wire. What strength magnetic field is produced at the center of the solenoid when a current of 10 A flows through it? (?0 = 4? × 10-7 T ? m/
A) A) 0.0063 T B) 0.20 T C) 3.2 T D) 4.8 T E) 0.31 T
The electric field in the region defined by the y-z plane and the positive x axis is given by E = ax, where a is a constant. (There is no field for negative values of x.) As x increases in magnitude, relative to V = 0 at the origin, the electric potential in the region defined above is
a. a decreasing function proportional to ?|x2|. b. a decreasing function proportional to ?|x|. c. constant. d. an increasing function proportional to +|x|. e. an increasing function proportional to +|x2|.
Which statement is correct?
A. Only radial-velocity and transit methods reveal the radius of the planet. B. Only direct imaging and gravitational lensing methods reveal the mass of the planet. C. Only radial-velocity and gravitational lensing methods reveal the mass of the planet. D. Only direct imaging and transit methods reveal the radius of the planet. E. None of these choices are correct.
What is Wein’s displacement law?
What will be an ideal response?