A long string is constructed by joining the ends of two shorter strings. The tension in the strings is the same but string II has 4 times the linear mass density of string I. When a sinusoidal wave passes from string I to string II: 

a)the wavelength increases by a factor of 2

b) the frequency decreases by a factor of 2

c)the wavelength decreases by a factor of 4

d)the wavelength decreases by a factor of 2

e) the frequency decreases by a factor of 4