A string has an abrupt change in linear density at its midpoint so that the speed of a pulse on the left side is 2/3 of that on
the right side. a. On which side is the linear density greater? Explain.
b. From which side would you start a pulse so that its reflection from the midpoint would not be inverted? Explain.
a) Linear density is greater on the left side because the velocity of wave in a string is inversely proportional to the linear mass density of the string
b) We should start pulse from the left hand side so the reflected wave does not get inverted because the wave traveling from the denser to lighter medium gets reflected in the same phase.
