The Nucleus and Radioactivity

ne materi hasil ngajar gw yang kedua setelah Magnet buat tahun ajaran baru ini hmmm..

cekidot..

Structure and properties of the nucleus

An alement X, an isotope of given Z and A is represented by

A is mass number

Z is the atomic number (protons number)

N is neutrons number

Atomic mass unit

Nuclear radius

Binding energy

Radioactivity

The number of decay , N is number of radioactive nuclei

Exponential decay

The activity 

Half-life

ada soal-soalnya juga loh..

Nuclear Properties and binding energy

1.       A pi meson has a mass of 139 Mev/c². What is this in atomic mass units?

2.       Estimate the diameter of the following nuclei

, , ,

3.       Write the appropriate symbol for the three isotopes of the following:

a. helium isotope with mass number 4
b. tin isotope with 66 neutrons
c. an isotope with mass number 235 containing 143 neutrons

4.       Find the mass difference between protons and neutrons. Express the result in units of u and MeV / c²

5.       A proton and an electron can be fused to form a hydrogen atom. Find the total mass of protons and electrons combined this

6.       a. What are the elements represented by the M in the following:

 , ,  ,

b. How many protons and how many neutrons do each of isotop

7.       Calculate the total binding energy and the binding energy per nucleon for

                 , 

Radioactive decay

8.       Au half-life was 2.7 days. (a) what is the decay constant of Au? (b) what is the probability for any nucleus Au decays in 1 second? (c) Suppose we have footage of Au as much as 1 microgram. What are its activities? (d) What is the number of decays per second which occurs when the age of one week this footage?

9.       age half-life of U is 7.04 x 10⁸ years. Secuplik rock, which solidified the earth 4.55 x 10⁹ years ago, contains a number of N atoms U. How many atoms N dikandungi rocks that had solidified at the time?