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Crookes Radiometer or Roentgenometer (Amazing Solar phenomena)

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Crookes Radiometer or Roentgenometer (Amazing Solar phenomena) Radiometer also known as solar engine, it spins using the energy from sun. Inside the glass globe there are a set of vanes...

₹. 790.00

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Crookes Radiometer or Roentgenometer (Amazing Solar phenomena)

  • Radiometer also known as solar engine, it spins using the energy from sun.
  • Inside the glass globe there are a set of vanes which are mounted on a spindle.
  • The vanes are alternately dark and light in color.
  • Bright side keeps its side cool while dark side absorbs heat and repel s the air.
  • Thus heat energy is converted into mechanical energy.
  • The stronger the light, the more energy there is causing the vanes to spin faster.
  • The Radiometer is another great science product that kids of all ages will love
  • Great Gift Idea
  • No batteries or electricity needed!

A radiometer or roentgenometer is a device for measuring the radiant flux (power) of electromagnetic radiation. Generally, a radiometer is an infrared radiation detector or ultraviolet detector.

The name Radiometer is frequently used to refer to a Crookes radiometer ("light-mill"), an early model device wherein a rotor (having vanes which are dark on one side, and light on the other) in a partial vacuum spins when exposed to light. A common myth (one originally held even by Crookes) is that the momentum of the absorbed light on the black faces makes the radiometer operate. If this were true however, the radiometer would spin away from the non-black faces, since the photons bouncing off those faces impart even more momentum than the photons absorbed on the black faces. Photons do exert radiation pressure on the faces, but those forces are dwarfed by other effects. The final explanation depends on having just the right degree of vacuum, and is more related to the flow of heat than the direct effect of photons.

The Nichols radiometer operates on a different principle and is more sensitive than the Crookes type.

A microwave radiometer operates in the microwave wavelengths. The radiometer contains argon gas to enable it to rotate.

The MEMS radiometer, invented by Patrick Jankowiak, can operate on the principles of Nichols or Crooke and can operate over a wide spectrum of wavelength and particle energy levels

For ages 8+