The diameter of an average nucleus is about
a. 10^-5 m.
b. 10^-7 m.
c. 10^-10 m.
d. 10^-14 m.
d
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Wave Characteristics: Which one of the following types of electromagnetic wave travels through space the fastest?
A. radio waves B. infrared C. ultraviolet D. microwaves E. They all travel through space at the same speed.
What effect, if any, does increasing the resistance in an RC circuit have on the charging of the capacitor?
a) The resistance has no effect on the charging of the capacitor, which is determined by the emf of the battery and the capacitance of the capacitor. b) Increasing the resistance causes the charging time to increase since the rate at which charges are moving to the capacitor increases. c) The charging time will increase as the resistance is increased because the rate at which charges are moving to the capacitor decreases. d) Increasing the resistance increases the charging time since the emf of the battery will be reduced. e) Increasing the resistance decreases the charging time since the emf of the battery will be reduced.
The wave equation is written down in an exam as
?
.
?
From dimensional considerations we see that
A.
.B.
.C.
D.
.E.
.An unusual lightning strike has a vertical portion with a current of ?400 A downwards. The Earth's magnetic field at that location is parallel to the ground and has a magnitude of 30 ?T. In N, the force exerted by the Earth's magnetic field on the 25 m-long current is
a. 0. b. 0.012 N, East. c. 0.012 N, West. d. 0.30 N, West. e. 300 N, East.