Suppose we look at two distant galaxies: Galaxy 1 is twice as far away as Galaxy 2. In that case
A) Galaxy 1 must be twice as big as Galaxy 2.
B) we are seeing Galaxy 1 as it looked at an earlier time in the history of the universe than Galaxy 2.
C) we are seeing Galaxy 1 as it looked at a later time in the history of the universe than Galaxy 2.
D) Galaxy 2 must be twice as old as Galaxy 1.
B) we are seeing Galaxy 1 as it looked at an earlier time in the history of the universe than Galaxy 2.
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The energy stored in a coil of self-inductance, L, and traversed by current I, is E1. A second coil is made with the same length of wire, but its radius is twice the radius of the first coil and it is twice as long as the first coil
If the second coil also has twice the current of the first coil, how does the energy stored in the first coil, E1, compare to the energy stored in the second coil, E2? A) E1 = E2 B) E1 = E2/8 C) E1 = 4E2 D) E1 = E2/2 E) E1 = E2/4
An ideal gas undergoes an adiabatic process while -25 J of work is done on it. What is the change in the internal (thermal) energy of the gas?
A) 0 J B) 25 J C) -25 J D) 50 J E) -50 J
Charge of uniform surface density (4.0 nC/m2) is distributed on a spherical surface (radius = 2.0 cm). What is the total electric flux through a concentric spherical surface with a radius of 4.0 cm?
a. 2.8 N × m2/C b. 1.7 N × m2/C c. 2.3 N × m2/C d. 4.0 N × m2/C e. 9.1 N × m2/C
When an electron transitions from a higher orbital level to a lower orbital level, a photon is ______
a. absorbed b. transitioned to somewhere else in that same orbit c. emitted d. None of the other choices are correct as a photon is not a product of or source to the transition.