Would you please solve it real quick, that will be helpful and appreciated. Thank you. I will give you a good feedback too.

6) The picture shows pulses in two different density strings which are tied together m a single pulse hit the boundary between the two strings. (a) which string is more dense? (b) Which pulse is the reflected pulse and which was the transmitted pulse? (o) Draw on the dashed line below the picture what the original pulse looked like before it hit the boundary, producing the two pulses shown