A string is fixed at both ends. The wave speed on the string is 63.0 m/s. A particular standing wave harmonic on this string has frequency 1268 Hz and the next lowest harmonic has frequency 951 Hz. Beginning with basic symbolic equations (from the equation list), use these equations to find (a) the length of the string, and (b) which harmonic corresponds to frequency 1268 Hz. Explain all of your reasoning, as always.

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.

How are the crust and the inner core alike? a) they are both solid. b) they both have the same temperature. c) they are both under the same pressure. d) they are both very close to the center of the earth.

Although longitudinal waves can travel through all media types what is the disadvantage of this type of wave transmission? a) he efficiency of he wave transmission is greatly diminished as the media becomes less dense b) the oscillation of one set of particles has a huge impact on neighboring particles c) particles become too close together as they bump into each other making it more likely to hit other particles down the line