This image is not available for purchase in your country.

Robert Pound, Canadian-US physicist

Robert Pound, Canadian-US physicist

H416/0427

Rights Managed

This image is not available for purchase in your country.

Please contact your Account Manager if you have any query.

Credit

EMILIO SEGRE VISUAL ARCHIVES / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY EMILIO SEGRE VISUAL ARCHIVES / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY

Restrictions:

Editorial use only.

Caption

Robert Vivian Pound (born 1919), Canadian-US physicist, carrying out a famous experiment in 1960 that confirmed a prediction of Einstein's General Relativity. Pound is at the top of a tower at Harvard University, and is communicating by telephone with Glen Rebka in the basement. They are using crystals to emit and absorb gamma radiation over the vertical distance of 22.5 metres. Einstein's theory had predicted that radiation changes in frequency as it travels through a gravitational field. The effect is tiny, but by clever experimental design and accurate measurements, Pound and Rebka were able, by 1964, to verify the slight shift in frequency.

Release details

Model release not available. Property release not required.

 {{ i.shot_duration ? i.shot_duration + ' ' : '' }}{{ i.shot_uhd ? '4K ' : i.hires ? 'HD ' : '' }}{{ i.spl_number }} R{{ i.license }}

  • Add to board
  • Similar {{ mediaType(i) }}