WAVES

What is true for ALL of the examples of electromagnetic waves?

• They all move at the same speed in a vacuum.

• They all have the same wavelength.

• They all have the same energy.

• They all have the same frequency.

We can see because light is....

• absorbed

• diffracted

• reflected

• refracted

You attend a football game one day and notice a long time difference between when the other side of the stadium stands up to cheer and when you hear them. This time difference would be lessened if.....

• it were warmer

• it were less humid

• it were located at a higher altitude

• the fans on the opposite side shouted louder

Light waves can be analyzed and modified using signal analyzers. Wave A comes in to the signal analyzer and it is changed into Wave B. Which statement is true regarding this situation?

• The intensity of Wave B is greater than that of Wave A

• Wave B travels out of the analyzer faster than Wave A went it

• Energy was added to Wave A to create Wave B

• the frequency of Wave A and Wave B are identical

All of these have which characteristic in common?

• They all need a medium to be transmitted

• They all transmit energy

• They are all pressure waves

• They are all part of the electromagnetic spectrum

How many numbers are there in the alphabet?

• 26

• 0

• 4

• 15

The wavelengths of radio waves are much _______________ than the wavelength of microwaves. Therefore, radio waves carry much __________ energy than a microwave.

• longer, less

• longer, more

• shorter, more

• shorter, less

Ultraviolet radiation is dangerous because it has a high enough energy to damage skin cells. UV radiation is called ultraviolet because it has a frequency which is higher than violet radiation (purple light). Therefore, it has a wavelength which is ____ than violet radiation.

• bigger

• smaller

• the same size

• the square root

The picture lists light waves from left to right in order of highest to lowest energy. Which region of the electromagnetic spectrum has the longest wavelength?

• UV

• Gamma rays

• Radio waves

• visible light

Sound travels fastest through

• space

• cool air

• warm air

• metal spoon