# QUESTION 1 Following are some Parent – Daughter isotope pairs with their half life: U-238 going to Pb-206 (T 1/2 = 4.5 x 10 9 years) U-235 going to…

QUESTION 1

Following are some Parent – Daughter isotope pairs with their half life:

• U-238 going to Pb-206 (T1/2 = 4.5 x 109 years)
• U-235 going to Pb-207 (T1/2 = 0.7 x 109 years)
• C-14 going to N-14 (T1/2 = 5700 years)

Q-1: If the C-14 : N-14 ratio in a shell in a sandstone was found to be 1 : 3, how old is the shell?

Q-2: If the U-235:Pb-207 ratio in a rock from Massachussets was determined to be 1 : 15, how old is the rock?

Q-3: (a) If the U-238:Pb-206 ratio in a crystal of zircon found in a sandstone was determined to be 1 : 7, what radiometric age will this give for the zircon?

(b) Does the determined age realistic? If no why not? If yes, how? (Explain briefly).

QUESTION 2

When a radioactive isotopes (parent – P) decay, they produce daughter products ( D) at a constant rate, called the half-life (T 1/2).

Example: if we start with 100 atoms of the parent, after one half-life, there will be 50 parent atoms remaining and 50 daughter atoms newly made. After another half-life (two half-lives), there will be 25 parent atoms remaining and now 75 daughter atoms. Each parent-d aughter isotope pair has its own half-life.

Complete the following half-life decay ratios between P (Parent isotope) and D (daughter isotope)

• 0 half-life:  P = 1, D = 0. P:D ratio = 1:0.
• 1 half life: P = 1/2, D = 1/2. P:D ratio = 1/2: 1/2 = 1:1.
• 2 half life: P = 1/4, D = 3/4. P:D ratio = __1:3___.
• 3 half life: P = ____1/8___, D = ______. P:D ratio = _______.
• 5 half life: P = ___ D = ________. P:D ratio = _______.

QUESTION 3

Each element of the period table is defined by the number of protons in the nucleus of the atom, which assigns the atomic number of the element. The mass number (amu = atomic mass units) of an atom is the sum of the protons (each proton = 1 amu) and the number of neutrons (each neutron = 1 amu).

Based on the above information, Th-232 (Thorium with mass = 232 amu, atomic number 90) would have _____ ___protons and ______ neutrons.

## Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
\$26
The price is based on these factors:
Number of pages
Urgency
Basic features
• Free title page and bibliography
• Unlimited revisions
• Plagiarism-free guarantee
• Money-back guarantee
On-demand options
• Writer’s samples
• Part-by-part delivery
• Overnight delivery
• Copies of used sources
Paper format
• 275 words per page
• 12 pt Arial/Times New Roman
• Double line spacing
• Any citation style (APA, MLA, Chicago/Turabian, Harvard)

# Our guarantees

Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.

### Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

### Zero-plagiarism guarantee

Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.

### Free-revision policy

Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.