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

The time needed for a wave to make one complete cycle is its

a bike is moving with a velocity of 90km/hr. after applying break it stops in 5 sec. calculate the force applied by brakes. mass of motercycle and rides is 200 kg

How is an ammeter connected to a circuit? a. One end is connected to the positive end of the battery and the other end is connected to the negative end. b. It is connected parallel to the circuit. c. Only one end is connected to the circuit. d.

How insulators get discharged

31. Newton's 3rd law is for every action, there is an equal and opposite reaction. True b. False a.

A falling back in mid air has what

What objects are often arranged by their properties

Which nuclei is not radioactive? A. Am-241 B. Mg-24 C. Pu-241 D. U-238

What is the method of charging used when you run a straw with fur

A man runs at a velocity of 6.2 m/s for 11.5 minutes. When going up and increasingly steep hill, he slows down at a constant rate of 0.25 m/s^2 and comes to a stop. How far did he run?