A standing wave on a string fixed at both ends is vibrating at its fourth harmonic. If the length, tension, and linear density are kept constant, what can be said about the wavelength and frequency of the fifth harmonic relative to the fourth harmonic?
(a) The wavelength of the fifth harmonic is longer, and its frequency is higher.
(b) The wavelength of the fifth harmonic is longer, and its frequency is lower.
(c) The wavelength of the fifth harmonic is shorter, and its frequency is higher.
(d) The wavelength of the fifth harmonic is shorter, and its frequency is lower.