1 Name the two classification of waves 2

1 - Name the two classification of waves. 2 - In which 2 directions can a wave move?

MYP: Can you hear (OR SEE) me NOW? AOI: Health and Social Education Learner Profile: Inquirer Essential Question: What are waves? Standard: S 8 P 4. Students will EXPLORE the wave nature of sound and electromagnetic radiation. • A. Identify the characteristics of electromagnetic waves and mechanical waves. • Learning Target: Today I am learning about the properties of waves, this is important because it will help me understand my world better. Homework: Study for upcoming quiz on Friday.

Opening

Work Session Notes on the Properties of Waves Page 574 -579

A. Crest The highest point of a wave

B. Trough The lowest point of a wave

Amplitude The distance from the crest or trough of a wave to the rest position.

What about LONGITUDINAL WAVES? • MEASURE OF HOW TIGHT THE COMPRESSIONS BECOME OR HOW LOOSE THE RAREFACTIONS.

Frequency a. The number of waves crests of a wave that pass one place in one second

Frequency b. Frequency is measure in hertz (Hz). One hertz = one wave per second

Frequency c. Frequency is represented by the letter f.

Frequency d. Example A: If ten wave crest pass a point every five seconds, what is the frequency of the wave?

Frequency d. Example A: If ten wave crests pass a point every five seconds, what is the frequency of the wave? f = ten waves / 5 seconds f = 2 hertz

WAVELENGTH • The distance between any 2 corresponding points on a wave. • For example, the distance between 2 crests in a transversal wave or 2 compressions in a longitudinal wave

WAVELENGTH AND ENERGY • SHORTER WAVELENGTH = MORE ENERGY • HOW DOES SHAKING A ROPE OR A SLINKY AT DIFFERENT RATES AFFECT THE WAVELENGTH OF THE WAVE THAT MOVES THROUGH THE ROPE/SLINKY? • WRITE A HYPOTHESIS?

Bill Nye

Closing

Formula: Velocity = wavelength x frequency v=λxf

Example: A wave is generated in a wave pool at a water amusement park. The wavelength is 4. 0 m. The frequency of the wave is 0. 50 Hz. What is the velocity of the wave? K U E S

1. A wave moving along a rope has a wavelength of 1. 2 m and a frequency of 4. 5 Hz. How fast is the wave traveling along the rope? K U E S

2. An ocean wave has a length of 10. 0 m. Two waves pass a fixed point every 1. 0 seconds. What is the speed of the wave? (Hint: Determine the frequency of the wave first. ) K U E S

Now you Try…. • 1. Determine the wave speed of a wave that has a wavelength of 5 m and a frequency of 4 Hz. • 2. What is the frequency of a wave if the wave has a speed of 12 cm/s and wavelength of 3 cm. ? • 3. A wave has a frequency of 5 Hz and a wave speed of 18 m/s. What is its wavelength?

Okay seat partners…. Write your answers to the next question on a magnetic board. You will have 10 seconds. Do not reveal your answers until asked to do so.

1. What do waves carry?

2. The distance between two wave crests is known as……

3. A wave passes you every 0. 5 seconds. What term is used to describe the number of waves passing a given point?

4. Which type of wave has compressions and rarefactions?

5. Draw a transverse wave.

6. What do you call the material that a wave travels through to transfer energy?

Waves Comprehension Check • • • 1. Name of Wave 8. Definition of Wave 9. Name of Wave 13. Another Name for the Wave 14. Definition of Wave # 4 is a BONUS