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

A. 6 g

B. 1.5 g

C. 12 g

D 3 g

How is light energy different from thermal energy

When an electron enters a magnetic field, it will accelerate up the field. True OR False

Is there any electric field inside a conductor carrying an electric current?

The phrase, "We the People" is the first phrase of the constitution and arguably the best know

What is the mass, in kilograms, of an avogadro's number of people, if the average mass of a person is 150 lb?

Which statement about how light travels is true? A Light waves need a medium to travel, and they travel at the same speed even if the light source is moving.

Explain why the car reaches a top speed even though the thrust Force remains constant at 3500N

4. A helicopter is flying at a height of 1.5km. If it has 50MJ of G. P. E., what is the mass of the helicopter?

Unless otherwise posted, what is the speed limit in a school zone? florida

If you put in 10 J of work to push 1 c of charge against and electric field what will be its voltage with respect to its starting position? when released, what will be it's kinetic energy if it flies past it's starting position?