The determination of the composition of a material by bombarding it with neutrons and monitoring the emitted radiation is neutron activation analysis
a. True
b. False
Indicate whether the statement is true or false
True
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A few collisions and mergers could leave a galaxy with no gas and dust from which to make new stars
Indicate whether the statement is true or false
Thermal radiation is defined as ________
A) radiation that is felt as heat radiation in the form of emission lines from an object B) radiation produced by an extremely hot object C) radiation with a spectrum whose shape depends only on the temperature of the emitting object
Water pressure on a submerged object is greatest against its
A) top. B) bottom. C) sides. D) same against all surfaces E) none of the above
100 grams of molten lead (600°C) is used to make musket balls. If the lead shot is allowed to cool to room temperature (21°C), what is the change in entropy (in J/K) of the lead? (For the specific heat of molten and solid lead use 1.29 J/g?°C; the latent heat of fusion and the melting point of lead are 2.45 × 104 J/kg and 327°C.)
A. ?145 B. ?252 C. ?302 D. ?429 E. ?100