Starter Look at your marked homework.

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Presentation transcript:

Starter Look at your marked homework. Lesson Aims: Look at your marked homework. Write your mark in the tracking sheet (Spectrum) Write what you need to improve onto the tracking sheet. Can you correct the answers you got wrong using your exercise book to help you?

Which has the higher pitch? Lesson Aims: B A

Which has the louder sound? Lesson Aims: The frequency of each sound is identical so what can you say about the pitch? B A

Sound Lesson Aims: Carry To be able to say if a sound will be in the range of human hearing from its frequency. To know the difference in a sound wave for a loud/ quiet/ high or low pitch sound. To explain the dB scale for loudness. To describe some effects of excess noise on health

What is Sound Lesson Aims: Sound is a vibration that travels as a wave from one place to another. Sound is detected by ears and microphones. A vibrating source is needed to create sound, for example your voice box, a loud speaker, a ruler that has been ‘twanged’. Sound travels through solids and liquids, but not through a vacuum.

Pitch and Volume Lesson Aims: Copy: A high pitch sound has many vibrations every second (a high frequency). A low pitch sound has less vibrations every second (a low frequency). A loud sound has large vibrations (a large amplitude). A quiet sound has small vibrations (a small amplitude). Trace diagrams…

Loudness Lesson Aims: The loudness of a sound is measured on the Decibel scale (dB). This scale is not linear. Prolonged and repeated exposure to sounds above 90dB can damage your hearing.

Range of human hearing Lesson Aims: Humans can typically hear sounds between frequencies of 20 to 20 000 Hz This range decreases with age. Sounds above this frequency are called ultrasound

Ultrasound Lesson Aims:

Investigating Sound Lesson Aims: Aim To see what effects the sound created by a test tube Method: Tap each test tube and observe Blow across each test tube and observe Blow over test tubes and demo tapping with beakers much better

Results Lesson Aims:

Conclusion Lesson Aims: When the test tube is tapped it is the ----- that vibrates. The more ----- there is the ----- the pitch of the note. The less ----- there is the ------ the ----- of the note. When the test tube is blown across it is the --- that --------. The more --- there is the ----- the ----- of the note. The ---- --- there is the ------ the pitch of the note.

Conclusion Lesson Aims: When the test tube is tapped it is water that vibrates. The more water there is the lower the pitch of the note. The less water there is the higher the pitch of the note. When the test tube is blown across it is the air that vibrates. The more air there is the lower the pitch of the note. The less air there is the higher the pitch of the note.