How Do Scientists Measure the Depth of the Ocean?
How Do Scientists Measure the Depth of the Ocean? Historically, before scientists developed new techniques, the depth of the ocean was actually measured by sending a...
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How Do We Hear Sounds?
How Do We Hear Sounds? When sounds are made, they set up movements in the air. These movements are called sound waves. The cup-like shape of the outer ear collects the...
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Why Does a Train Whistle Change Its Pitch When It Passes?
Why Does a Train Whistle Change Its Pitch When It Passes? You may have noticed that the pitch of a train whistle seems to rise when the train is approaching and drop as...
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How Does My Voice Carry over the Telephone?
How Does My Voice Carry over the Telephone? When you speak into a telephone, the sound of your voice causes a thin metal plate inside the mouthpiece to vibrate back and...
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