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Asia-Pacific Forum
on Science Learning and Teaching, Volume 14, Issue 1, Article 11 (Jun., 2013) |
A (Student responses for text 1)
Part 1
Please answer the question by explaining your reasons.
“We would call this a high-pitched sound. This characteristic has to do with the change in the pitch level of the sound.”
Part 4
Did you change your mind after reading the text? If you did, please express your views once again considering the text now, and give an example.
“Yes, it changed it. I now believe that when we turn the music down, we’re changing not the pitch level, but the intensity.”
Part 5
Now, let’s answer the following questions:
I. What is the “intensity of sound?
I. “It’s the characteristic of the sound’s being loud or soft…”
II. What is the “pitch level of sound?”
II. “It’s the highness or lowness of the sound.”
III. What type of relation is there between the “frequency of sound” and the “pitch level of sound?
III. “There’s a direct relationship. If the frequency of the sound is high, the pitch of the sound is high too.”
IV. What characteristic of sound explains the fact that dogs can hear the sounds that human beings cannot? Can you give other examples?
IV. “It can be explained by frequency. For instance, bats and human beings.”
V. Which characteristic of sound can be changed by using a remote control device?
V. “We can change the intensity of the sound.”
B (student responses for text 2)
Part 1
Please answer the question by explaining your reasons.
“Sound travels faster in the atmosphere. Because there’s nothing in its way.”
Part 4
Did you change your mind after reading the text? If you did, please express your views once again considering the text now, and give an example.
“It changed because I learned that speed is related to the closeness of molecules. They are faster in a table and slower in water, for example.”
Part 5
Now, let’s answer the following questions:
I. How do sound waves travel?
I. “They move by squeezing and expanding.”
II. Does sound travel at the same speed in solids, liquids and gases? Why? Why not?
II. “They’re not the same. Distances between molecules are different.”
III. Does sound intensity change as it moves away from its source? Why? Why not?
III. “There would be a change. It would be less because it moves further away.”
IV. Can planting trees in front of our houses contribute to sound insulation? Explain your views please.
IV. “It would lessen because of the obstruction of the trees.”
V. Is it possible to hear the sound of a ticking clock in an airtight jar? Why? Why not?
V. “No, we can’t hear it. Sound doesn’t travel in an airless medium.”
Copyright (C) 2013 HKIEd APFSLT. Volume 14, Issue 1, Article 11 (Jun., 2013). All Rights Reserved.
