I can be both a sound and a light, but I’m not heard or seen until I travel. What am I?
Category: Science · Difficulty: hard
Hint: I am defined by my frequency and wavelength.
Answer
Message
Explanation
A wave can refer to both sound waves and electromagnetic waves, and they are characterized by their frequency and wavelength.
This is a hard science riddle — a tricky one that takes a little thought. The answer is Message.
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