A high speed train travels through a station without slowing. An accordionist playing on the platform notices that the pitch of the train's horn is different as it approaches compared to the pitch after it has passed. Furthermore she notices that the ratio of the frequencies is 3/2. 6. Find a value for the speed of the train. 7. The accordionist also notices that when the train is precisely 14.4 m away from her the sound level is 110 dB. Find a value for the time after it passes the station when the sound level is 50 dB.

A high speed train travels through a station without slowing. An accordionist playing on the platform notices that the pitch of the train's horn is different as it approaches compared to the pitch after it has passed. Furthermore she notices that the ratio of the frequencies is 3/2. 6. Find a value for the speed of the train. 7. The accordionist also notices that when the train is precisely 14.4 m away from her the sound level is 110 dB. Find a value for the time after it passes the station when the sound level is 50 dB.