Which type of reaction happens when a base is mixed with an acid?

A.metal-base reaction

B.neutralization reaction

C.metal-acid reaction

D.spontaneous reaction

B

Explanation:

Usually, when a strong acid and a strong base is mixed together, the pH is neutralized, hence why it's called a neutralization reaction.

option (c)

Explanation:

the relation between the wavelength, frequency and wave velocity is given by

velocity = wavelength x frequency

As the wavelength is doubled, the frequency remains constant as it is the property of source.

So, the velocity becomes doubled.

Option (c) is true.