Selective breeding. That is, breeding which uses extreme selectivity
Explanation:
It is given that,
Frequency of vibration, f = 215 Hz
Amplitude, A = 0.832 mm
(a) Let T is the period of this motion. It is given by the following relation as :



(b) Speed of sound in air, v = 343 m/s
It can be given by :




Hence, this is the required solution.
The smallest unit that makes up matter is an atom!
Solar cells are used to trap sunlight energy (light energy) and convert it to electric energy for domestic and other purposes.