Suppose a radioactive isotope has a half-life of 2.0 hours. For an initial sample of 6400 nuclei, the number remaining after 6.0 hours is about ________.
Fill in the blank(s) with the appropriate word(s).
800
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In general, as the yield strength of a given alloy increases, the ductility _________.
Fill in the blank(s) with the appropriate word(s).
Glass in a florist's greenhouse acts as a one-way valve in that it
A) lets light energy flow only in one direction. B) cuts off unwanted radiation. C) allows high-frequency waves in and blocks low-frequency waves exiting. D) is transparent only to lower-frequency waves.
A 0.50-kg toy is attached to the end of a 1.0-m very light string. The toy is whirled in a horizontal circular path on a frictionless tabletop
If the maximum tension force that the string can exert on an object without breaking is 350 N, what is the maximum speed the toy can have without breaking the string? A) 700 m/s B) 26 m/s C) 19 m/s D) 13 m/s
If a substance is radioactive it is definitely a. dangerous. b. emitting alpha particles. c. glowing. d. useful. e. all of the above. f. none of the above
Indicate whether the statement is true or false