The waves of an earthquake are detected by an instrument called a
a. seismometer.
b. seismogram.
c. seismograph.
d. seismoscope.
c
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An air sample is contaminated with 15O, which has a half-life of 2.03 min. One possible way to minimize its hazard is to pass it through a long pipe to allow it to decay inside the pipe until it can be safely released into the atmosphere
If the oxygen moves at a speed of 1.1 m/s in the pipe, how long must the pipe be for the sample to have decayed to 3.0% of its original activity just as it leaves the pipe? A) 680 m B) 8.0 m C) 7.0 m D) 2.0 m
Assuming that the outside air pressure is standard, 101.3 kPa, what pressure must one generate inside the mouth in order to drink water through a straw whose opening is 12 cm above the water surface?
A. 94.5 kPa B. 102.5 kPa C. 100.1 kPa D. 89.5 kPa
What are "forbidden lines"? Briefly describe how they form
What will be an ideal response?
All stars ignite helium fusion as part of the aging process
a. True b. False Indicate whether the statement is true or false