A sample contains 10 g of a radioactive isotope. How much radioactive isotope will remain in the sample after 2 half-lives?

A. 7.5 g

B. 5.0 g

C. 2.5 g

D. 10.0 g

What happens when you fumble out of bounds?

In the center of the Milky Way galaxy is a a Black hole b Neutron star C Supernova d Nebula

What is common between transverse waves and longitudinal waves

Light from a fluorescent lamp is observed through a cloud of cool nitrogen gas. Again, two students are having a discussion about the kind of spectra that they would see.

Electromagnetic radiation with a frequency of 8.6 ' 1014 hz incident on an unknown metal surface causes ejection of photoelectrons with kinetic energies of 1.3 ' 10-19 j. what is the unknown metal?

How long do you stay in school here in Auburn schools

A current of 6.0 A through a circuit for 2.5 minutes. how much charge was delivered to this circuit? 15 C 25 C 600 C 900 C

Two rubber bands pulling on an object cause it to accelerate at 1.2 m/s^2 ... a. What will be the object's acceleration if it is pulled by four rubber bands?. b.

Why do earthquakes and volcanoes occur along continent and ocean boundaries?

Why do different liquids have different viscosities?