Discussion
Write only the wrong statement out of the following is :
Answer: D
The wrong statement is Light cannot travel through vacuum.
Light is an electromagnetic wave and needs no medium; it travels fastest in a vacuum, at about \(3 \times 10^{8}\) m/s, which is how sunlight reaches the earth across empty space.
The other three statements are true. Light travels in straight lines in a uniform medium (hence sharp shadows), it is a wave motion, and its speed is vastly greater than that of sound, about 340 m/s in air, which is why lightning is seen before thunder is heard.
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