State and describe the three phases of matter
What will be an ideal response?
The three common phases of matter are solid, liquid, and gas. A solid maintains a fixed shape and a fixed size; even if a large force is applied to a solid, it does not readily change in shape or volume. A liquid does not maintain a fixed shape - it takes on the shape of its container - but like a solid it is not readily compressible, and its volume can be changed significantly only by a very large force. A gas has neither a fixed shape nor a fixed volume - it will expand to fill its container.
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The vibrational direction of an electron and the plane of polarization of the light it emits
A) are the same. B) are at right angles to each other. C) may or may not be at right angles to each other. D) are independent of each other.
The presence of elements heavier than helium in stars is very important because
A) they provide the raw materials for the formation of planets and life B) without them they could not form C) they help stabilize their interiors D) they are responsible for the fusion reactions at their centers
The self-inductance of a solenoid increases under which of the following conditions?
a. Only the solenoid length is increased. b. Only the cross sectional area is decreased. c. Only the number of coils per unit length is decreased. d. Only the number of coils is increased.
The Oort cloud was probably formed by planetesimals that were tossed to the outer parts of the Solar System by the planets.
Answer the following statement true (T) or false (F)