1. Describe how a sound wave travels through the ear. 2. Explain how a trumpet produces a sound and how the pitch can be changed. It comes from vibration in the trumpet and to change the pitch you have to adjust the opening in your lips

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a.   mass number from atomic number

conservation of mass

mass before something happens = mass afterwards

electrical potential energy =0.072 j

explanation:

electrical potential energy is given by

u= q δv

q= charge=6 c

δv= potential difference and is given by

δv= e d

e= electric field

d= distance=5 mm=0.005 m

δv=2.4 (0.005)=0.012 v

now electric potential energy= u= q δv

u=6 (0.012)

u=0.072 j