The loudness of a sound is related to the amplitude squared of the wave
Indicate whether the statement is true or false
TRUE
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In a laboratory accident a work area is contaminated with radioactive material. Health physicists monitor the area during a 30-day period and, after correcting for the background rate, obtain the data shown in the table
Time (days) 0 2 6 11 19 30 Counts/min 1000 899 727 557 364 202 The accident occurred at t = 0. They determine that it will not be safe for workers to enter the area until the radioactivity level has dropped to 133 counts per minute. Of the choices listed below, which one is the earliest time that workers could safely return? A) 38 days B) 44 days C) 50 days D) 32 days E) 24 days
In the context of the double-slit experiment, quantum uncertainty refers to
A) the fact that the particles of matter or radiation are instantaneously replaced by a spread-out matter field or EM field when the particles impact the screen. B) the fact that the electron beam or light beam goes through both slits rather than only one. C) our inability to precisely predict the point at which a spread-out matter field or EM field will interact with the screen. D) the fact that the entire matter field or EM field instantaneously collapses to the single interaction point when the field interacts with the screen. E) the fact that each interaction with the screen occurs over a broad area of the screen.
When light passing through a prism undergoes dispersion, the effect is a result of:
a. different wavelengths traveling at different speeds. b. different wavelengths having different indices of refraction. c. different wavelengths refracting differently. d. All of the above.
If the tension on a guitar string is increased by a factor of 2, the fundamental frequency at which it vibrates is changed by what factor?
a. 0.5 c. 2–1/2 b. 21/2 d. 2