For pictures:
page 1: https://in.pinterest.com/pin/525584218999086282/
page 2: https://www.rdmag.com/article/2017/06/sound-waves-help-particles-heal
page 2: https://in.pinterest.com/pin/519462138241321637/
page 3: https://in.pinterest.com/pin/572731277582697045/
page 3: https://www.grc.nasa.gov/www/k-12/airplane/sound2.html
page 4: https://in.pinterest.com/pin/6262886966848294/
page 4: https://in.pinterest.com/pin/558094578804307965/
page 5: https://in.pinterest.c583779170417736146/