Answer
The speed of light is about 300,000,000 m/s, about a million times faster than the speed of sound in air (roughly 340 m/s).
Therefore, lightning is seen before thunder is heard.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 19 - Think and Explain - Page 371-372: 71
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