The half-life for a 400-gram sample of radioactive element X is 3 days. How much of element X remains after 15 days have passed? A.
12.5 g

B.
25 g

C.
50 g

D.
100 g

There is a single path for electrons. the current decreases when additional resistors are added. the current will be the same in each resistor. these statements best describe a(n) circuit.

What is a metal replacement reaction

What type of electromagnetic waves does the human eye see as the colors red blue or green a visible light waves b radio waves c infrared waves d microwaves