A sample contains 24 g of a radioactive isotope. How much radioactive isotope remains in the sample after 2 half-lives?

A. 3 g

B. 6 g

C. 12 g

D. 1.5 g

Which phrase most accurately describes a chemical change?

By using the principle of dimensional consistency, what is the correct dimension for thermal conductivity in the SI?

a train travels 81 kilometers in 2 hours and then 88 kilometers in 2 hours what is its average speed

Describe the wave motion and mechanical wave movement of a seismic P wave 20 pts

Is france a example of a developed country true or false

Which of these rocks are formed by volcanic activity? select the two correct answers. a. marble b. basalt c. limestone d. granite e. sandstone

Which source is most likely an authority on the subject? Dr. Vale, a pediatrician, discusses electrical circuitry on her home-improvement website. Jonah, an amateur cook, teaches his son how to make the best grilled cheese sandwiches.

What methods can be used to break down substances into elements

8. A gas is contained in a horizontal piston-cylinder apparatus at a pressure of 350 kPa and a volume of 0.02 m3. Determine the work done by the piston on the gas if the cylinder volume is increased to 0.15 m3 through heating.

A 75.0 kg person stands on a scale in an elevator. (a) What does the scale read (in N and in kg) when the elevator is at rest?