You'll NEVER guess what's the difference between Russians and Americans

(a) What do you mean by the terms 'Layers' and 'Broilers'? (b) List atleast three other differences between 'layers' and 'broilers'

Assertion: For two sources to be coherent phase difference between two waves at all points should be same. Reason: Two different light sources are never coherent.

How do you account for the difference in melting points between (a) and (b) between (c ) and (d) and between these two differences ? .

What do you mean by pitch or frequency ? What is difference between them ?