Which of the following instruments is used for measuring radiation?

The correct answer is Bolometer.

Key Points

• A bolometer is an instrument used for measuring the power of incident electromagnetic radiation.
• It was invented by Samuel Pierpont Langley in 1878.
• A bolometer measures the energy of incoming radiation by heating a material with a temperature-dependent electrical resistance.
• It is highly sensitive and can detect minute amounts of radiation, making it useful in various fields such as astronomy, physics, and climate science.

Additional Information

• Ammeter
  • An ammeter is a device used to measure the current in a circuit.
  • It is connected in series with the circuit to measure the flow of electric charge.
  • Ammeter readings are usually given in amperes (A).
• Lactometer
  • A lactometer is used to measure the specific gravity of milk.
  • It helps in determining the purity and quality of milk.
  • It measures the density of milk relative to water.
• Radiation
  • Radiation refers to the emission or transmission of energy in the form of waves or particles through space or a material medium.
  • It includes electromagnetic radiation such as radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
  • Radiation can also be classified as ionizing or non-ionizing based on its ability to ionize atoms and molecules.
• Applications of Bolometer
  • In astronomy, bolometers are used to measure the radiation from stars and other celestial objects.
  • In physics, they help in the study of blackbody radiation and other thermal processes.
  • In climate science, bolometers are used to measure the earth's radiation budget.