Radioactive Decay: Polonium-215, 
Po, undergoes alpha decay with a half-life of 1.8 ms.(a) What percent of the original polonium-215 is left after 0.010 s?(b) How many protons and neutrons does the daughter nucleus contain?
What will be an ideal response?
(a) 2.1% (b) 82 protons, 129 neutrons
You might also like to view...
It is desired to study the radiation heat loss (or gain) from the surface of an automobile engine. Assume that the engine is a gray opaque convex surface radiating with a heat exchanger for cooling engine coolant (called a radiator) on one side. Assume that the radiator is also a gray opaque flat surface. The engine also radiates with the road surface underneath (a black body), the hood and fender wells (assume these are one reradiating surface) and the firewall (a black body). Construct a circuit to describe these processes and identify all of the radiosities, black body emitters ( Ebi), and resistances in terms of the emissivities, areas, and shape factors.
An astronaut in space swings a ball attached to a string in a circular motion. If the string suddenly breaks, how will the ball move?
A) It will move in a straight line in whichever direction it was moving when the string broke. B) It will continue to move in the same circular path it had been following before the string broke. C) It will instantly come to a stop. D) It will move toward the astronaut. E) It will move in a large elliptical path around the astronaut.
Consider the following processes: The temperature of two identical gases are increased from the same initial temperature to the same final temperature. Reversible processes are used. For gas A the process is carried out at constant volume while for gas B it is carried out at constant pressure. The change in entropy:
A. is the same for A and B B. is greater for A C. is greater for B D. is greater for A only if the initial temperature is low E. is greater for A only if the initial temperature is high
Balance the chemical equation: Al2S3+ H2O ? Al(OH)3 + H2S