The conservation of energy equation must include
A. Work done on the system
B. Thermal energy added to the system
C. Thermal energy leaving the system
D. Work done by the system.
E. All of these are correct.
Ans: E. All of these are correct.
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What do you notice about the relationship between the angular size of the galaxy and its redshift (how far the wavelength is shifted)?
A: The redshift tends to be larger if the angular size is smaller. B: The redshift tends to be smaller if the angular size is smaller. C: There seems to be no relationship between redshift and angular size.
Which of the following has the shortest wavelength?
a) Visible light b) Gamma Ray c) Ultraviolet d) Radiowaves
What is the speed of a proton that has been accelerated from rest through a potential difference of 4.0 kV?
A. 1.1 × 106 m/s B. 9.8 × 105 m/s C. 8.8 × 105 m/s D. 1.2 × 106 m/s E. 6.2 × 105 m/s
A changing current in one loop of wire can induce a current in another loop of wire even though the wires do not touch. The induced current appears almost instantaneously for loops close together. How can this energy exchange happen?
a. This is one of those things for which science has no adequate explanation yet. b. The second loop is affected by the thermal exchange from the heating of the first loop. c. It is a gravitational effect on the electrons. d. It is done via an electromagnetic wave.