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71.9 x 49.3 cm ⏐ 28.3 x 19.4 in (300dpi)
MIKKEL JUUL JENSEN / SCIENCE PHOTO LIBRARY MIKKEL JUUL JENSEN / SCIENCE PHOTO LIBRARY
Measuring speed of sound, computer illustration. The speed of sound in air is 340 metres per second. Therefore, the time taken between a person creating a sound (left) and someone else hearing it 340 metres away (right) is one second - as shown on the digital timer (lower right).
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