The maximum permissible workday dose for occupational exposure to radiation is 11 mrem. A 77 kg laboratory technician absorbs 2.3 mJ of 0.5 MeV gamma rays in a work day. The relative biological efficiency (RBE) for gamma rays is 1.00
The number of gamma-ray photons absorbed by the technician in a workday is closest to: A) 3 × 1010
B) 3 × 109
C) 3 × 108
D) 1 × 109
E) 1 × 108
A
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Middle C has a frequency of 262. Hz. What is the frequency of C an octave higher?
A) 2.10 kHz B) 786. Hz C) 0.524 kHz D) 270. Hz E) 2.62 kHz
Nexrad radar uses a frequency of 2.7 GHz to measure the speed of cloud systems. The radio waves from the transmitter are sent outward to the cloud system and reflected back, Doppler shifted. A Nexrad system observes clouds moving toward the transmitter at 21 m/s. What is the difference between the transmitted frequency and the frequency received after reflection off the cloud surface?
A. 380 Hz B. 760 Hz C. 570 Hz D. 190 Hz
The Law of Universal Gravitation was developed by:
A) Kepler. B) Galileo. C) Newton. D) Copernicus. E) Einstein.
Which of the following observations is consistent with the hypothesis that all life on Earth has a common ancestor?
A) different organisms use the same set of amino acids B) different organisms use different sets of amino acids C) all proteins are made of amino acids D) some organisms don't use amino acids at all