Answer:
(a)sound wave resonating in an organ pipe
(b)vibrating string on a violin
Answer:
The speed increases because the tension is increasing.
Answer:
y(x,t)= (18 cm)cos[(3.1 )x + (47
)t] or
y(x,t)= (18 cm)cos[((2π/2.0) )x + ((2π × 7.5)
)t]