Electromagnetic Spectrum quiz
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Which color does metal glow first as it heats up?
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More questions about Electromagnetic Spectrum
These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.
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Which light can bees see that humans can't?
Answer: Ultraviolet
Why: Bees' eyes sense ultraviolet, blue and green but not red, so a pure red flower looks black to a bee.
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What lets AM radio reach much farther at night?
Answer: The ionosphere
Why: By day the ionosphere's low D layer soaks up AM signals; after dark it fades, so the waves bounce off higher layers far away.
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How long are the radio waves given off by cold hydrogen gas?
Answer: 21 cm
Why: These radio waves slip through the dust that hides much of the Milky Way, letting astronomers map its hydrogen-rich spiral arms.
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What does an airport scanner use to see inside bags?
Answer: X-rays
Why: By comparing high- and low-energy X-rays, scanners color organic items such as food orange and metal objects blue.
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How can you spot a TV remote's invisible flashes?
Answer: With a phone camera
Why: Silicon camera chips sense near-infrared light out to about 1,100 nanometers, well past the limit of human eyes.
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About how long are the waves of a 100 MHz FM station?
Answer: 3 m
Why: Most countries broadcast FM between about 87.5 and 108 MHz, so their stations' waves are roughly 2.8 to 3.4 meters long.
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