The probability that a certain radioactive mass emits no particles in a one-minute time period is 0.1353. What is the mean number of particles emitted per minute?
What will be an ideal response?
Let ? be the mean number of particles emitted in one minute. Let X be the number of particles actually emitted during a given minute.
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Determine the rate of refrigeration for an air conditioner.
The ideal vapor refrigeration cycle utilizes R134a between saturation temperatures of ?20°C and 40°C. It has a flow
rate of 0.6 kg/s.
A) 14 tons
B) 18 tons
C) 22 tons
D) 26 tons
The most serious blow to Lyndon Johnson's Vietnam policy
A. came with the bombing of Cambodia. B. occurred when Defense Secretary Robert McNamara resigned. C. was the Tet offensive of 1968. D. occurred when Senator J. William Fulbright's Foreign Relations Committee held public hearings on the war. E. came with the revelation that the Tonkin Gulf attacks had been provoked by the United States.
Which of the following is not a true statement regarding the requirement for grounding of equipment?
A. When within 8 ft (2.5 m) vertically or 5 ft (1.5 m) horizontally of ground or grounded metal objects and subject to contact by persons B. When in a hazardous (classified) location as covered by Articles 500 through 517 C.When supplied by a metal-clad, metal-sheathed, metal-raceway, or other wiring method that provides an equipment ground D. When equipment operates with any terminal at over 50 volts to ground
A ________ is the pattern showing how voltage changes with time
A) frequency B) logic change C) voltage D) waveform