7-4 Wave Speed

7-4 Explain: Wavelength and Frequency

Mr. Custer's Physics​

​Today's

Date​

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Learning Objectives

1. Relate wave speed to wavelength and wave frequency.

2. Show how to calculate wave speed.

3. Explain how wave speed is related to the medium of a wave.

​Mechanical

Waves

• ​ Require a medium for the vibrations to travel.

• ​The speed at which they travel depends on the medium.

​Electromagnetic Waves

• ​All electromagnetic waves travels at the speed of light 3.0 x 10⁸ m/s in a vacuum.

• They travel fastest in less dense medium.

• Ex: Radio waves, Microwaves, Infrared, Visible Light, Ultraviolet, X-rays, and Gamma Ray.

Multiple Choice

When a mechanical wave is sent, ______ moves through the particles in the mediums. These particles then move back and forth sending the wave throughout the medium.

• reflections

• electromagnetic waves

• vibrations

• light

• matter

Multiple Choice

Sound waves move the fastest through....

• gases

• liquids

• solids

Velocity: m/s

Wavelength: m

Frequency: Hertz​

Equation Triangle

​

• Use the triangle to rearrange the wave speed equation.

  1. Cover the unit you need to calculate.

  2. The horizontal line represents division.

  3. The vertical line represents multiplication

Multiple Choice

The vertical line means

• addition

• subtraction

• multiplication

• division

Multiple Choice

The horizontal line means

• addition

• subtraction

• multiplication

• division

Multiple Choice

Frequency =

• Wave speed * Wavelength

• Wave speed / Wavelength

• Wave speed + Wavelength

• Wave speed - Wavelength

Multiple Choice

Wavelength =

• Wavespeed * Frequency

• Wavespeed / Frequency

• Frequency * Wavespeed

• Frequency/wave speed

Multiple Choice

Wavespeed =

• Wavelength * Frequency

• Wavelength / Frequency

• Wavelength + Frequency

• Wavelength - Frequency

Multiple Choice

A wave has frequency of 50 Hz and a wavelength of 10 m. What is the speed of the wave?

• 500 m/s

• 50 m/s

• 5 m/s

• 0.5 m/s

Multiple Choice

A wave has frequency of 5 Hz and a speed of 25 m/s. What is the wavelength of the wave?

• 25 m

• 125 m

• 5 m

• 25 m/s

Multiple Choice

What is the frequency of a wave traveling at 300 m/s with a 4 m wavelength?

• 0.013 Hz

• 75 Hz

• 300 Hz

• 1200 Hz