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.
Answer: E
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A sample of helium (He) occupies 44.8 L at STP. What is the mass of the sample?
A) 2 g B) 4 g C) 6 g D) 8 g E) 10 g
A charge Q accumulates on the hollow metallic dome, of radius R, of a Van de Graaff generator. A probe measures the electric field strength at various points outside the sphere surface. If the probe is initially at a distance 2R from the sphere's center and then is moved to 3R, by what factor will the electric field reading change?
a. (3/2)2 b. 3/2 c. 2/3 d. (2/3)2 e. 1
A satellite is in a circular orbit 600 km above the Earth's surface. The acceleration of gravity is 8.21 m/s2 at this altitude. The radius of the Earth is 6400 km. Determine the speed of the satellite, and the time to complete one orbit around the Earth.
What will be an ideal response?
A system consisting of a negatively-charged particle and an electric field
a. gains potential difference and kinetic energy when the charged particle moves in the direction of the field. b. loses electric potential energy when the charged particle moves in the direction of the field. c. gains kinetic energy when the charged particle moves in the direction of the field. d. gains electric potential energy when the charged particle moves in the direction of the field. e. gains potential difference and electric potential energy when the charged particle moves in the direction of the field.