Physics
Transition ions absorb light in :

Visible region
Infrared region
Ultraviolet region
Microwave region

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Physics
Should cars have bumpers that collapse under impact?

No, since it would be very expensive to get the car repaired
Yes, since they help to absorb the impact of a collision and keep the occupants safe
Yes, since the offending car should get damaged and pay for the mistake
No, since the colliding car would then ram into the occupants and kill them

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