Item 1. SECTION A Answer all the items from this section A brass band was invited to play during a celebration near a tall building, a distan slightly more than 17 m away. Two friends standing in the same direction and in line with the playing band, heard the sound from the band at different intervals of time which attracted them to go and attend the celebration. On arrival, the sound they heard was unclear, confused and indistinct. Later in the night during the cerebration, coloured lights flashing red, blue and green made the colours of their clothes look different from the original colours which puzzled the Hint: Speed of sound in air-330 ms The two friends heard sound after 4 s and 5 & respectively The friends were originally wearing yellow clothes Task: APER As a physics student, help the two friends to understand why they heard the sound at different intervals. (a) b) the sound they heard was unclear, confused and indistinct. c) the colour of their clothes kept changing when coloured lights flashed on them.à plus l'endroit c'est vrai de doubler tu ​