Is molded bread a physical or chemical change?

A molded bread is a good example of a chemical change. A chemical change is a kind of change in which a new substance is formed. In a chemical change, the original substance which started the reaction can not be recovered.The molded bread formed in this given instance is a new substance which is different from the original bread, so also, the original bread can no longer be retrieved from the molded bread.

The frequency of a certain wave is the quotient obtained by dividing the speed of the wave by the wavelength. That is 
                                          f = s/λ
Substituting the known values,
                                          f = (5.6 m/s) / 3.3 m
                                             = 1.7/s
                                             = 1.7 Hz