Four metal samples have the measured properties shown.
Sample Hardness (Vickers) Electrical Conductivity (% IACS) Density (g cm−3)
P 50 97 8.96
Q 120 28 8.40
R 320 7 7.85
S 70 95 7.10
Which sample is most likely a copper–zinc substitutional alloy (brass)?
a) Sample P
b) Sample R
c) Sample Q
d) Sample S