Describe two ways in which an atom can be excited
What will be an ideal response?
An atom can become excited through collisions with other atoms, which happens very often in a hot gas, where atoms move rapidly and collide often. An atom can become excited by absorbing a photon. Only a photon with exactly the right amount of energy can move the electron from one level to another.
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A source of sound remains stationary relative to the person in this figure. If the sound source remained stationary but the person moved toward the source, how would the frequency heard by the person change?
a. The frequency would be higher. b. The frequency would be lower. c. The frequency would remain the same. d. The answer depends on distance to the source.
Work-Energy Theorem: A 4.0 kg object is moving with speed 2.0 m/s. A 1.0 kg object is moving with speed 4.0 m/s. Both objects encounter the same constant braking force, and are brought to rest. Which object travels the greater distance before stopping?
A. the 4.0 kg object B. the 1.0 kg object C. Both objects travel the same distance. D. It cannot be determined from the information given.
In western movies you often see a person putting his ear against the rails in the train tracks to find out if a train is approaching. Why would this give him advance knowledge of the approach of a train?
What will be an ideal response?
The current theories of gravity are ________ because they do not incorporate a proper description of matter on the smallest scale
Fill in the blank(s) with correct word