1 of 20

To describe hearing ranges and ultrasound

Science - Light and Sound

2 of 20

2

Questions (Video)

3 of 20

Identify the correct label

3

  1. Ossicles
  2. Cochlea
  3. Tympanic membrane

4 of 20

Identify the correct label

4

  • Malleus
  • Cochlea
  • Stapes

5 of 20

Identify the correct label

5

  • Pinna
  • Ossicles
  • Ear canal

6 of 20

Convert the following frequency measurements

  1. 18 kHz to Hz

​

  • 300 Hz to kHz

​

  • 6.5 kHz to Hz

​

  • 4000 Hz to kHz

7 of 20

7

Questions (Worksheet)

8 of 20

Task 1 - Animal hearing range question

  1. A mouse can make noises with a frequency of 12 kHz. Would you expect an owl to be able to hear this frequency? Explain your answer.

​

​

​

  • Mice can also produce sounds with a frequency of 24 kHz. Thinking about your answer to Question 1, why might this be important?

9 of 20

Task 2 - Analysing data

9

  1. If I wanted to use a high pitch noise to keep a cat out of my garden, what frequency sound should I use?

​

  • What animals would be able to hear a 15 kHz sound?

​

  • Which animal can detect a higher pitched sound, a bat or a porpoise?

10 of 20

Task 3: Explain how and why ultrasound is used to create an image of a baby

Key words: high frequency, hertz, image, cancer, reflect

​

Sentence starters:

  1. Ultrasound is…
  2. The wave is emitted on to the woman’s uterus and…
  3. Is is better to use ultrasound rather than x-rays because…

11 of 20

11

Answers (Video)

12 of 20

Identify the correct label

12

  • Ossicles
  • Cochlea
  • Eardrum

13 of 20

Identify the correct label

13

  • Malleus
  • Cochlea
  • Stapes

14 of 20

Identify the correct label

14

  • Pinna
  • Ossicles
  • Ear canal

15 of 20

Convert the following frequency measurements

  1. 18kHz to Hz

kHz to Hz: multiply by 1000. 18 x 1000 = 18 000Hz

  • 6.5kHz to Hz

kHz to Hz: multiply by 1000. 6.5 x 1000 = 6500Hz

  • 300Hz to kHz

Hz to kHz: divide by 1000. 300 / 1000 = 0.3kHz

  • 4000Hz to kHz

Hz to kHz: divide by 1000. 4000 / 1000 = 4kHz

16 of 20

16

Answers (Worksheet)

17 of 20

Task 1 - Animal hearing range answers

  • A mouse can make noises with a frequency of 12 kHz. Would you expect an owl to be able to hear this frequency? Explain your answer.

I would expect an owl to be able to hear sounds at 12 kHz, because they hunt mice. This means that their hearing range needs to be able to pick up the sounds that their prey make.

  • Mice can also produce sounds with a frequency of 24 kHz. Thinking about your answer to Question 1, why might this be important?

Owls have a maximum hearing range of 12 kHz. By being able to produce sounds with a frequency of 24 kHz, mice can communicate without the owl being able to hear them.

18 of 20

Task 2 - Analysing data

18

  • If I wanted to use a high pitch noise to keep a cat out of my garden, what frequency sound should I use? 75-77 kHz

​

  • What animals would be able to hear a 60 Hz sound? Human, Cat

​

​

  • Which animal can detect a higher pitched sound, a bat or a porpoise? Porpoise

19 of 20

Task 3 - Explain how and why ultrasound is used to create an image of a baby

Key words: high frequency, hertz, image, cancer, reflect

​

Sentence starters:

  • Ultrasound is a sound with a frequency above 20kHz (higher than the top of human hearing).
  • The wave is emitted on to the woman’s uterus and will reflect off the baby and be detected by the machine, creating an image of the baby.
  • It is better to use ultrasound rather than x-rays because it is safer. There is no risk of harming the baby/causing cancer.

20 of 20

20

Developed in partnership and made possible �by joint funding from Commonwealth, state �and territory governments.

For more resources

​

edresearch.edu.au

​

​

​

ochre.org.au

​

@EdResearchAU

@OchreEducation