In order to identify the solid Adam is followed chemical technique or procedure to identify the unknown solid reacts with acid or not.
A chemical test is a qualitative and quantitative procedure performed to identify or quantify a chemical compound or a substance.
Where as physical test is a qualitative and quantitative procedure which deals physical properties of substance like: density, temperature etc.
Biological test deals is qualitative and qualitative test which deals with testing of biological properties of the substance like: Diatoms(unicellular microorganisms) present in water bodies.
Radical test is a qualitative and quantitative procedure which is done to identify and quantify the radicals present in given substance or a chemical compound.For Example: Qualitative and quantitative analysis of anion cation.
frequency it the measure of the wave length. The measure of the peaks and troughs is how you measure the frequency. the distance between these is the wave length.