Answer the following statement(s) true (T) or false (F)
1. Suppose we create a traveling compression wave in a spring that has one end fixed. When the wave reflects from the fixed end, it will be inverted (that is, compression will become rarefaction and vice versa).
2. Suppose you are near one end of a 150-m-long cylindrical tunnel open to the air on both ends. If you give a shout, you might hear an echo.
1. FALSE
2. TRUE
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What is "uncertain" in the Heisenberg Uncertainty principle?
A. The energy of the particle when it has wave properties B. The exact number of protons in the nucleus C. The value of the particle's position when the particle's momentum is known precisely D. The value of the Planck's constant E. The time period of the wave describing the particle
The removal of the carbon dioxide from the atmosphere is critical to Earth because:
A) an atmosphere rich in carbon dioxide can trap heat. B) carbon dioxide is transparent to infrared radiation. C) carbon dioxide is opaque to ultraviolet radiation. D) carbon dioxide reduces plants' ability to synthesize energy.
When a metal plate with a hole in it is cooled, the size of the hole becomes
1) smaller, 2) larger, 3) remains the same size, and when the plate is heated, the hole becomes 4) smaller. 5) larger. 6) remains the same size.
The supermassive black hole at the center of the galaxy is:
A.) 15 light-years away. B.) 300 light-years away. C.) 8,800 light-years away. D.) 26,000 light-years away. E.) 90,000 light-years away.