Light consists of tiny 'corpuscles' called photons that possess momentum. This canbe demonstrated with a radiometer, shown in the sketch. Metal vanes are paintedblack on one side and white on the other and are free to rotate about the point of aneedle mounted in a vacuum. When photons are incident on the black surface, theyare absorbed; when photons are incident on the white surface they are reflected. Uponwhich surface is the impulse of light greater, and which way will the vanes rotate?Explain.2.9 H.กรวยแก้วเล็ก ๆครอบบนปลายเข็มแหลม

The light bouncing off from white surface transfer twice as much momentum as light absorbed on a…

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