Conceptual Physics

constituent is (n,n,n) and its saturation equals (Nín)/N. For example, the saturation of the vibrant red mentioned above is

(246 í 15)/246 = 94%. (a) What is the saturation of the red-tinged gray color (124, 100, 100)? (b) What is the saturation of the

dark green (33, 76, 45)? (c) What is the saturation of the light blue (213, 225, 255)?

(a) %

(b) %

(c) %

1.10 A live outdoor radio broadcast is disrupted when someone fires a gun into the air right in front of the microphone. The sound

of the shot is broadcast via radio waves to a communications relay satellite in a geosynchronous orbit 35,790 km directly

overhead, and back down to the radio in a police car parked 85.0 m away from the microphone. The sound waves of the

gunshot also travel directly through the air to the car, at a speed of 343 m/s. Which sound does a police officer in the car hear

first, the broadcast sound or the direct sound?

Broadcast Direct

Section 2 - Electromagnetic waves

2.1 The diagram below shows the electric and

magnetic field components of an

electromagnetic wave at a certain location and

at a certain instant in time. Is the wave

traveling toward you or away from you?

Toward you Away from you

Section 3 - Proportionality of electric and magnetic fields

3.1 An electromagnetic wave in a vacuum has an electric field amplitude of 417 V/m. What is the magnetic field amplitude of this

wave?

T

3.2 An electromagnetic wave in a vacuum has an instantaneous magnetic field strength of 7.50eí7 T at a certain point. What is

the instantaneous electric field strength of the wave at this point?

V/m

3.3 Here is a pair of sinusoidal functions describing an electric and a magnetic field that vary in space and time.

They cannot be the field equations of an electromagnetic wave. Why not?

Copyright 2000-2007 Kinetic Books Co. Chapter 30 Problems^573