Question

AM radio stations broadcast at frequencies between 530 kHz 1700H. (1 kHs-10/8) Note that Planck's constant is 8.63 10 . the speed of 3.00 sing at 1.55 x 10" , what is the many of this radio wave? Energy

Answer 1

Answer:

Given frequency of broadcasting, v=1.55 x 10^3 kHz

Since 1 kHz=1000 s^-1,

then frequency, v=1.55 x 10^3 x 10^3 s^-1=1.55 x 10^6 s^-1.

Energy of this radio wave, E=hv

Where h=Plank's constant=6.623 x 10^-34 J.s

Energy, E=6.63 x 10^-34 J.s x 1.55 x 10^6 s^-1.

E=1.0276 x 10^-27 J.

The energy of this radio wave is

E ~ 1.03 x 10^-27 J.

Please let me know if you have any doubt. Thanks