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 80 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
YES! Correct, THANKS for helping me on my review

bblaney

  • Member
  • Posts: 323
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

In inpatient settings, adverse drug events account for an estimated one in three of all hospital adverse events. They affect approximately 2 million hospital stays every year, and prolong hospital stays by between one and five days.

Did you know?

Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.

Did you know?

Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

Did you know?

This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

Did you know?

Every flu season is different, and even healthy people can get extremely sick from the flu, as well as spread it to others. The flu season can begin as early as October and last as late as May. Every person over six months of age should get an annual flu vaccine. The vaccine cannot cause you to get influenza, but in some seasons, may not be completely able to prevent you from acquiring influenza due to changes in causative viruses. The viruses in the flu shot are killed—there is no way they can give you the flu. Minor side effects include soreness, redness, or swelling where the shot was given. It is possible to develop a slight fever, and body aches, but these are simply signs that the body is responding to the vaccine and making itself ready to fight off the influenza virus should you come in contact with it.

A female parent with ducklings in Richmond Park, London, England A female parent with ducklings in Richmond Park, London, England
Sample equipment maintenance log. Sample equipment maintenance log.
Sample Medicare identification card. Sample Medicare identification card.
Sample Daily Log For Holistic Self-Care Plan. Sample Daily Log For Holistic Self-Care Plan.
Rock Type Influences Weathering Rock Type Influences Weathering
A 2.000 g sample of water contains 11.19% H by mass and 88.81% O by mass. What mass of H will ... A 2.000 g sample of water contains 11.19% H by mass and 88.81% O by mass. What mass of H will ...
Video: Reflex arc construction

For a complete list of videos, visit our video library