Title: Sound Waves True or false: 1.Waves always travel through a solid 2.Frequency affects the pitch of a noise 3.A high frequency means the wavelength will be long 4.A low amplitude means the noise will be loud 5.Sound waves can travel through water 6.Sound waves are caused by vibrating objects 7.Dogs can hear sounds at a higher frequency than humans. EXT: Rewrite the false statements so they are correct

Title: Sound Waves True or false: 1.Waves always travel through a solid 2.Frequency affects the pitch of a noise 3.A high frequency means the wavelength will be long 4.A low amplitude means the noise will be loud 5.Sound waves can travel through water 6.Sound waves are caused by vibrating objects 7.Dogs can hear sounds at a higher frequency than humans.

Sound Waves L/O: To recap sound waves and differentiate between ultrasound and infrasound. Describe Ultrasound and its uses (too high frequency to hear 20KHz+) Calculate depth or distance from time and velocity of ultrasound pulses Describe Infrasound and its uses (too low to hear 20Hz-)

JCX - Y11 W+R Wavelength Amplitude VibrationVibration Direction of travel

JCX - Y11 W+R Height (m) Time (s) Frequency – The number of waves per second. If one wave passes in one second it has a frequency of one Hertz or Hz. This is the unit of frequency.

PPQ Knowledge

PPQ wavelength amplitude Knowledge

Longitudinal and Transverse There are two types of waves: Longitudinal and transverse. They move differently and have difference effects.

Gas particles in the air are easily __________. How vibrations make waves compressed If a vibrating object moves towards air particles……

…the air particles get squashed together. This is called compression.

The air particles can spread out again. This is called rarefaction.

High pressure/ Compression Low pressure/ rarefaction Pressure changes caused by vibrations

Draw a sound wave for a loud and quiet sound. Draw a sound wave with a long and short wave length. Draw a sound wave with a high frequency. Comprehension

Use your knowledge of sound waves to explain the poster for Alien. Application

can-you-hear-this-hearing-test/ T1L-nN-E

Copy the diagram (you don’t need to draw the animals)

Infrasound Infrasound is a sound that is below the range of human hearing (i.e. below 20 Hz). Some animals use infrasound to communicate. We can use it to listen for these animals.

Infrasound Infrasound is also produced by volcanoes and earthquakes. Some people believe that animals can sense these infrasounds before the eruptions or earthquakes start. wrGPe7Y

Infrasound Infrasound is also produced when meteors pass Earth. We can listen for these using specialist equipment. This means we can be more prepared for a meteor landing on Earth, which could cause considerable damage.

Infrasound Vladimir Gavreau was an infrasound pioneer. While conducting experiments in the 1950s he became aware that his lab assistants were experiencing pain due to low frequency sounds. He used this information to produce and infrasound gun. This was lethal as it rapidly induced internal bleeding when used on humans. At low power it would shake walls and ceilings to pieces. Whales, alligators, elephants and rhinos all communicate by infrasound.

Plenary Answer questions 1-8 in your revision pack. DO NOT LOSE THESE THIS TIME!!!!!!!