What are beats and how are they produced?
What will be an ideal response?
Answer: Beats are the sequence of alternating reinforcement and cancellation (constructive and destructive interference of two sets of superimposing waves differing in frequency, and heard as a throbbing sound. Beats have a frequency of their own equal to the difference between the two wave frequencies. Beats are evident when a pair of slightly mismatched tuning forks is sounded, and when a pair of whining diesel engines run side by side.
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Conversion of Units: There are 2.00 dry pints to 1.00 dry quart, 8.00 dry quarts to 1.00 peck, 4.00 pecks to 1.00 bushel. An organic farmer wants to pick enough berries to fill 40,000 pint containers. How many bushels of berries does the farmer need?
Fill in the blank(s) with the appropriate word(s).
How has Earth's interior remained warm over its geological history?
A. the greenhouse effect B. tidal stresses from the Moon C. Earth's proximity to the Sun D. leftover heat from formation E. radioactive decay
Captain Ray, on the Galactic Explorer, sets off bright signal lights at the two ends of his spaceship so that they are seen as flashing simultaneously by General Kay, who is watch the ship go by. General Kay concludes that she was next to the midpoint of the ship at the instant when the lights flashed in her reference frame. This can only happen if Captain Ray, at the center of the Galactic Explorer,
A. sees the lights flash simultaneously in his coordinate system. B. sees the bow (front) light flash before the aft (rear) light. C. sees the aft (rear) light flash before the bow(front light. D. can calculate that the light flashes reach General Kay so that the flash from the bow light reaches her before the flash from the aft light. E. can calculate that the light flashes reach General Kay so that the flash from the aft light reaches her before the flash from the bow light.
When studying the structure of ocean waves one could look at all of the following except _______.
a. Wave length b. Tidal force c. Wave height d. Period