exam 3 physics 2 Fred

Describe electromagnetic waves in vacuum, your answer should contain relationships of the electric and magnetic fields relative to each other and the direction of propagation. Relationships between electric and magnetic fields and relationships between, wavelength, frequency and speed. Who first derived these relations?

he diagram above shows our breakdown of the electromagnetic spectrum. Explain one method of creating X-rays.

use a high energy electron to knock out a core electron -causing an outer electron to drop down and the x-ray is emitted

or when high energy electrons are suddenly decelerated

The diagram above shows our breakdown of the electromagnetic spectrum. What device inside a microwave oven is responsible for making microwaves

cavity Magnitron

what are the requirements for a surface to be optically flat

roughness less than a tenth of the wavelength used

when a who first successfully measured the speed of light

in 1849 and Fizeau

Which has more of an effect, the energy carried by an electromagnetic wave or its momentum?

Energy

What is dispersion

Variation of index of refraction N with wavelength Lambda (upside down y)

You go to Walgreen's to buy a pair of reading glasses. The label says"+ 2.5" What does this say about the lenses?

the glasses converge with focal length of 40cm (2.5=1/0.4m)

what is total internal reflection provide uses and dangers

when light dosn’’t emerge at an interface but is reflected back in uses: fiber optic cable danger: objects in water my not be visible from above

what do Fresel’s equations tell you

how much light is reflected

In terms of electromagnetic waves, what was Hertz's contribution to our understanding?

Hertz verified Maxwell's predictions by generating and detecting electromagnetic waves in the lab it is also observed in photoelective efface

what lens took this photo

Fish eye

A laser operates with a wavelength of 530 nm, what is its frequency?

that is the purpose of a thin film coating on a solar cell