Atomic physics - mass ration

1. The problem statement, all variables and given/known data

which of the following mass ration is ture?

Mass of alpha-particles: mass of neutrons : mass of gamma- rays
equal to

A. 4 : 1 : 0
B. 4 : 0 : 1
C. 1 : 1 : 1
D. 1 : 1 :0


2. Relevant equations

nil

3. The attempt at a solution

I thought it's D
but the correct answer is A.
I can't get it..
 

rsk

159
4
An alpha particle consists of 2 protons and 2 neutrons, which are of equal mass (well, very nearly, anyway).
 
wow... silly me.
Thank you!
 

dextercioby

Science Advisor
Homework Helper
Insights Author
12,905
494
Alpha particle (in the past aka "alpha radiation") is the common name for the helium nucleus.

Daniel.
 

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