Four discs, each soaked in a different antibiotic, were placed on the surface of a culture plate that had been innoculated with E. coli bacteria. The diagram below shows the culture plated
after it had been incubated for 48 hours.

Key:
Shaded area
represents E. coll
Clear area represents
absence of E. coli
Antibiotic disc
P= penicillin
E=erythromycin
8 = streptomycin
C=chloramphenicol

Whích antibiotic was most effective in inhibiting the growth of E. coli?
1.penicillin
2.erythromycin
3.streptomycin
4.chloramphenicol

what are the awnser choices? i mean, without choices, it is an incompleat

answer: zinc is the substance which has a volume of 1.38 .

density is defined as the mass of an object per unit volume.

it can be calculated by dividing mass of a substance by its volume i.e.

si unit of density is kg per cubic meter and cgs unit of the same is gram per cubic centimeter.

now from the given data volume can be calculated by the formula .

hence, the volume of aluminium will be = which comes out to be 1.703 .

similarly, volume of zinc, chromium, and nickel will be 1.378 , 0.869 , and 0.356 respectively.