Answer:
(a) Energy will be 675 J
(B) charge will be 450 C
(C) Total number of particles will be [tex]281.25\times 10^6[/tex]
Explanation:
We have given that a flashlight uses 0.75 watts of power
So power P = 0.75 watt
Voltage is given as V = 1.5 volt
Time is given as t = 15 minutes
We know that 1 minute = 60 sec
So 15 minutes = [tex]15\times 60=900sec[/tex]
(A) We know that energy is given by [tex]E=P\times T=0.75\times 900=675j[/tex]
(b) We know that energy is also given by [tex]E=QV[/tex]
So [tex]675=Q\times 1.5[/tex]
[tex]Q=450C[/tex]
Now we have given charge on each particle [tex]=1.6\times 10^{-6}C[/tex]
So number of charge particle [tex]n=\frac{450}{1.6\times 10^{-6}}=281.25\times 10^6[/tex]
