Two Wave Trains Travel on a String Under a Constant

Multiple Choice

Two wave trains travel on a string under a constant tension T.Which of the following statements is NOT correct?

A) The two waves can have different speed.
B) The two waves can have different frequency.
C) The two waves can have different wavelength.
D) The superposition principle applies for the two waves.
E) At any point on the string,the resultant amplitude is the algebraic sum of the amplitudes of the two waves.