Mean Life: The decay constant of neptunium-239 is 0.2975 d-1. What are its (a) half-life and (b) mean life?
What will be an ideal response?
(a) 2.330 d (b) 3.361 d
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Which light source is more energy-efficient?
A) a fluorescent lamp B) an incandescent lamp C) a CFL D) an LED
The relative density of dust to gas is least in which place?
A) the interstellar medium B) dark nebulae C) the atmosphere of Earth D) molecular clouds E) reflection nebulae
What is the temperature increase of 3.00 kg of water when heated by a 900-W immersion heater for 9.00 min? (cw = 4 186 J/kg/°C)
a. 77.4°C b. 48.4°C c. 38.7°C d. 19.4°C e. 0.645°C
The appearance of the great range of brightness among stars is due to
A) the differences in the amount of light different stars emit. B) the differences in the distances of stars from us. C) both of the given answers D) none of the given answers