This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: A rock sample contains 1/2 microgram of the parent radioactive isotope U-235 and 1/2 microgram of ... (Read 91 times)

ereecah

  • Hero Member
  • *****
  • Posts: 530
on: Jul 27, 2018
A rock sample contains 1/2 microgram of the parent radioactive isotope U-235 and 1/2 microgram of its daughter isotope Pb-207. If the half-life of this decay is 700 million years, how old is this rock?
 
  A) 1400 million years
  B) 2100 million years
  C) 700 million years
  D) 350 million years

Question 2

A current reading is obtained by properly placing an ammeter in a circuit consisting of one resistor and one battery. As a result
 
  A) the voltage drop across the resistor increases.
  B) the current flowing in the circuit increases.
  C) the current flowing in the circuit decreases.
  D) the current flowing in the circuit does not change.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Bigfoot1984

  • Sr. Member
  • ****
  • Posts: 321
Reply #1 on: Jul 27, 2018
Answer to Question 1

C

Answer to Question 2

C


ereecah

  • Member
  • Posts: 530
Reply 2 on: Jul 27, 2018
Gracias!

  • Member
  • Posts:
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

Did you know?

More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.

Did you know?

A recent study has found that following a diet rich in berries may slow down the aging process of the brain. This diet apparently helps to keep dopamine levels much higher than are seen in normal individuals who do not eat berries as a regular part of their diet as they enter their later years.

Did you know?

There are more nerve cells in one human brain than there are stars in the Milky Way.

Did you know?

Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.

Layers of Rock Laid Down by Water Layers of Rock Laid Down by Water
Volcanoes Are Rock Factories Volcanoes Are Rock Factories
Rock Cornish Game Hen Rock Cornish Game Hen
How reciprocal functions compare to the parent function How reciprocal functions compare to the parent function
A sample of baking soda is heated and releases carbon dioxide gas into a 1000-mL A sample of baking soda is heated and releases carbon dioxide gas into a 1000-mL
In situ hybridization between a radioactive probe In situ hybridization between a radioactive probe
Video: How do the different types of chromatography work? (No Audio)

For a complete list of videos, visit our video library