Name: 為什麼聲音在夏天比冬天傳播得快？| 冬天的聲音比夏天快？ (Why does sound travel faster in summer than in winter? | #aumsum)
Uploaded: 2021-01-14T08:10:40.000Z
Duration: 1 min 55 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

Why does sound travel faster in summer than in winter?

The television switched on immediately after you clapped.

Now, I bet you that the television will not switch on instantly after your clap.

Do you know why the sound took more time to reach the television?

This is because the speed of sound decreased.

Speed of sound depends on the temperature of the medium.

Higher the temperature of the medium, more will be the speed of sound and vice versa.

So, in this case, what do you think is the medium?

During summer season, the temperature of air increases.

At higher temperature, the molecules of air have more kinetic energy.

Hence, they vibrate faster leading to increase in speed of sound.

Now, during winter season, the temperature of air decreases.

With the decrease in temperature, the kinetic energy of the molecules also decreases.

Hence, the molecules do not vibrate much.

As a result, the speed of sound decreases during winter season.

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為什麼聲音在夏天比冬天傳播得快？| 冬天的聲音比夏天快？ (Why does sound travel faster in summer than in winter? | #aumsum)

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