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Which instrument is used to measure the wavelength of radiation absorbed by a substance?

Question: Which instrument is used to measure the wavelength of radiation absorbed by a substance?
  • A. Thermometer
  • B. Spectrophotometer ✓
  • C. Barometer
  • D. Hygrometer
Correct Answer: B. Spectrophotometer
Explanation: Used in labs to measure absorption of light at specific wavelengths.

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