Waves-

A train is moving by you. You estimate the train cars to be 10 meters long and 3 pass by you every second. What is the speed of the train?

How does this equation apply to wave motion?

What is frequency?

How is frequency used with computers?

How is frequency used with tuning forks? (sound)

v = ƒλ

If we were talking about ______we would say ______equals ______times ______.

Frequency is how often something is repeating, units for ƒ are always something per ______(strides per second, train cars per second, waves per second). Something per second is called the ______(___)

A 1.8 GHz computer processor is able to process 1.8 billion (Giga means billion) pieces of information each ______.

A 500 __ tuning fork moves back and forth (vibrating the air) 500 times per ______

What is the difference between a vibration and a wave?

What do waves carry from one place to another?

What is a transverse wave?

______– wiggle in time

______- wiggle in space and time

Waves carry ______from one place to another.

Transverse wave – trans means ______and in this case the ______is perpendicular (across) to the motion of the wave. All ___ waves are transverse, like visible light. All ___ waves travel 3 x 108 m/s. It takes about 1 second for light to travel from the ______, 8.3 minutes to travel from the ______and 4.3 years from the nearest star (not the sun) to Earth.

Figure 1

What is a longitudinal wave?

What travels as this type of wave?

Longitudinal wave – sometimes called a ______ wave. The ______in the wave is in the ______direction as the ______of the wave. This type of wave needs to have ______to move so it cannot travel through ______.

______is a type of compression wave. Sound travels about _____ m/s in air.

Figure 2

Because ______travels so much faster than ______, sometimes you can see something happen and not hear it until later.

Wave comparison

Figure 3

Parts of a transverse wave-

______(A)– height of a wave from rest position to the top

______(λ) – straight line distance from one point on a wave to a repeating point

______– top of a wave

______– bottom of a wave

## Important features of a wave-

______(T) – Time for a wave (s/wave)

______(ƒ) – How many waves in a second (wave/s)

**Period and frequency are reciprocals of each other.

T = 1/ƒ and ƒ = 1/T