Document1 Word Maya Biv gn Layout References Malings Review View Help Tell me wh

Question

Document1 Word Maya Biv gn Layout References Malings Review View Help Tell me what you want to do : a ITNornalI1No Spac Heading 1 Heading 2 Tide Subtle Subtle Em Paragraph 1. In a certain UHF radio wave, the shortest distance between positions at which the electric and magnetic fields are zero is 0.356 m. Determine the frequency of this UHIF radio wave. 2. A laser emits a narrow beam of light. The radius of the beam is 1.80 x10 m, and the power is 1.60 x10- W. What is the intensity of the laser beam? er 3, An industrial laser is used to burn a hole through a piece of metal. The average intensity of the light is S = 1.34 x10, W/m, what is the rms value of each of the following fields in the electromagnetic wave emitted by the laser? magnetic field? F9 F10 F7 FB F3 FSF6

Explanation / Answer

For radio waves:
wavelength * frequency = 3*108 m/s (speed of light)

One complete cycle is a sine wave.
The sine wave is equal to 0 two times in each cycle -- at 180° and at 360°/0°.

The shortest distance between positions at which the electric and magnetic fields are zero is one half of a wavelength (cycle.)  

You know that 1/2 of a wavelength is 0.356 m (wavelength will be 0.356*2=0.712m)
You know the speed of light.

0.712*frequency=3*108

frequency=421348314.6 Hz

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