.| The activity below draws from the content in the page Information Processing and expands on the activity Echolocating with Dolphins. Related information on sound waves can be found in another topic, The Patterns to Transfer Information. |
Phenomenon:
Animals use sound to send and recieve information (Fig.1).
Inquiry:
How do animals use sound to communicate?
Guiding Questions:
- What is communication?
- What does whale communication sound like?
- How do scientists study whale communication?
Activity:
In this activity, you will explore how whales use sound to communicate!
Materials:
- Student worksheet and teacher guide (attached below)
- Colored Pencils
- Highlighters (at least three different colors)
- Internet connection
- Speakers to play sound
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Teacher Recommendations
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Procedure:
- Follow along on your worksheet to harmonize with humpbacks!
- You will make a spectrogram to chart the sound you hear. You will be listening for differences in pitch and volume of the sounds.
- Pitch: the highness or lowness of sound. Think about a deep voice versus a high, squeaky voice.
- Volume: quantity or power of sound; degree of loudness. Think about a whisper versus a loud scream.
- Read the guide to help you understand how to plot the sound.
Spectrogram
A spectrogram is an image made by graphing sounds. Time is on the x-axis in seconds and the pitch is on the y-axis. If the pitch increases, the line on the graph goes up. Volume is represented by color. As the sound gets louder, the line gets brighter in color. If the sound stops, you will have a gap in the line for that given amount of time of silence. See Figure 2 for an example whale song that changes in pitch and volume.
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Practice making sounds with different pitches and volumes.
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Visit The Chrome Music Lab to experiment with using your own voice to make a spectrogram. This will help you to 'see' the sounds you are making. Try and make the spectrogram from Figure 2 above using your voice! Note: If you enjoy playing with the Chrome Music Lab, build in extra time here and keep experimenting!
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Go to the NOAA Fisheries Sounds in the Ocean page to listen to the sample humpback whale song (19 sec).
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Describe the sound you heard.
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Listen again to the same whale song. Use the graph on your worksheet to plot the pitch of the whale song over time. Note: You may have to listen to the sound repeatedly as you are creating your spectrogram.
- Assign three different colors of highlighters to represent volume: quiet, medium, and loud. Fill in the table legend on the graph on your worksheet to indicate which color you are using to represent each volume.
VOLUME HIGHTLIGHTER COLOR Quiet Medium Loud - Listen once more to the same song and highlight the line as the sounds change in volume.
- Describe the sound again using the spectrogram as a reference.
Activity Questions:
- How did making the spectrogram help you to describe the whale song?
- What additional information can scientists get from a spectrogram of a whale song (compared to just listening)?
- Read the paragraph about whale songs and fill in the blanks using the vocabulary below:
Harmonizing with HumpbacksHumpback whales are famous for their complex songs. Only the male humpbacks sing, and they only sing during the _________________ season in Hawai'i. The ______________ is usually alone in a head-down, tail-up position. If the singer is following a cow and calf pair, he is called a(n) __________________. When another whale joins in on the song, he is called a(n) ________________. Humpback whales do not have vocal cords. They produce sounds by pushing air through tubes and chambers in their ____________________ system. Scientists use ___________________ to listen to, and record, whale songs. Researchers can play the songs into a computer that creates a(n) __________________, which is a picture of each sound. Whale researchers study patterns on spectrograms to learn about why whales sing, and how they react to other whales around them. Scientists have developed some _______________ to try to explain why whales sing. Scientists also study whale songs to learn about how _________________, caused by people, affects the behavior of whales. Ship engines, military sonar, and explosions used by oil and construction companies make loud sounds under water that may cause changes in the whales’ ____________________________. *behavior *escort *mating *singer *hydrophones *noise pollution *spectrogram *joiner *respiratory *hypotheses |
- Did you see any evidence of noise pollution in your music lab spectrograms (Hint: what happened when people were talking nearby)?
- How do you think noise pollution can affect whale behavior?
- Research and describe other ways sound is represented visually.
