What is the half-life of this radioactive substance? Count rate graph attached.

Question

hhopke · Answer

attachment

anonymous · Answer

Half life is when the starting or initial value goes down to half its amount.
At t=0s, the count per minute is 240.

hhopke · Answer

So the half-life is the time taken for the count rate to be 120? @Shalante

anonymous · Answer

Yes 240/2=120
Now figure the day period that the counting per minute is 120. It can in decimals or fraction.

hhopke · Answer

Okay. Thank you so much!

anonymous · Answer

No problem!

jmansedg · Answer

shal can you help me it wont let me post so here you go The shape a mineral forms when slowly solidifying one layer of molecules at a time is called
	A.	hardness
	B.	luster
	C.	crystal form
	D.	geoform

hhopke · Answer

Probably geoform, but I haven't taken that class yet.

anonymous · Answer

Crystals in a mineral are in layers after layers.

jmansedg · Answer

thank you