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Half-Life

Zero and Second Order Reaction

The second order reaction for the decomposition of nitrosyl bromide has a half life of 12.5s at a concentration of 0.100M. NOBr(g)-->NO(g) + 1/2Br2(g) I need help finding k for the reaction, and how would I find how long it will take to decompose 80 % of a 0.0500M solution of nitrosyl bromide, and how fast 0.200M solutio

C-14 Dating

A very old specimen of wood contains 10^12 atoms of carbon: a) How many C-14 atoms did it contain in the year of 9474 B.C.? b) How many C-14 atoms did it contain in 2004 A.D.?

Nuclear Medicine

Email me for Clarification. I only need Parts C and D... I solved A and B, the answers are below. Not too much work left for 25 credits. Your help is appreciated. The only radiogenic lead isotope that is not either stable (Pb-206, 207, 208) or with a halflife of less than one day is Pb-210, which is found in nature in sec

Relativity

At standard Temperature and pressure sound travels at speed u=330m/s relative to the air through which it propagates. Four students A,B,C and D position themselves as shown if figure 1.20 (see attachment), with A,B,C in a straight line and D vertically above B. A steady wind is blowing with speed 30m/s along the line ABC. If

32P Half-Life Problem

Question: 32P has a half life of 14.26 days. If you start with 200.0 g of it, how many grams will remain after a time of 3(14.26) days?

Radioactive decay

A threory of nuclear astrophysics is that all the heavy elements like uranium are formed in supernova explosions of massive stars, which immediately release the elements into space. If we assume that at the time of the explosion there were equal amounts of 235U and 238U, how long ago were the elements that formed our Earth rele

Calculate Half-life

A 10.0 g sample of uranium-27 (u-237) undergoes beta decayy. After 27.0 d, 0.625 g of U-237 remains. Calculate the half-life of u-237. Please show me each step in the calculations. Thanks.

Quantities that could be modelled by exponential growth or decay

Select the three options which are NOT examples of quantities that could be modeled by exponential growth or decay. Options A. The number of students registering for named degress at the Open University, if each year there are 5% more than the previous year. B. The world's reserve of a certain mineral, given that 1000

Half life of a radio active material

A radio active substance has a half life of 30 days. Calculate (a) the radioactive disintegration constant (b) The average life (c) the time taken for ¾ of the original number of atoms to disintegrate and (d) the time taken for 1/8 of the original number of atoms to remain unchanged

Nuclear physics

1. An alpha particle is fired at a sheet of gold with a kinetic energy of 4.62E-13 joules. Knowing that each gold nucleus has 79 protons, about how close will the alphas come to the nucleus? 2. If the binding-energy-per-nucleon for an alpha particle is 61.0 MeV, what is the total binding energy of the alpha? Give you answer