photoelectric threshold

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noun Physics.

the minimum frequency or maximum wavelength of incident radiation necessary to release photons from a given surface.

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Words nearby photoelectric threshold

Interpreted more broadly, the phrase loses meaning: what constitutes the necessary threshold of realism?
The Birth of the Novel|Nick Romeo|November 27, 2014|DAILY BEAST
There is one final lesson to learn before he crosses the threshold from darkness to glory.
The Walking Dead’s Luke Skywalker: Rick Grimes Is the Perfect Modern-Day Mythical Hero|Regina Lizik|October 28, 2014|DAILY BEAST
She took her temperature on Monday and noted it was slightly elevated to 99.5, just under the threshold for worry.
Ebola Nurses Are As Brave As Soldiers|Michael Daly|October 17, 2014|DAILY BEAST
That year was really the first year that I stepped over the threshold and became more of a collaborator.
‘Boyhood’ Star Ellar Coltrane: An Astonishing Debut 12 Years in the Making|Kevin Fallon|July 11, 2014|DAILY BEAST

Once a threshold osmolality is reached in our bodies, it triggers our brains to make us seek water.
When Table Salt Becomes Poison|Russell Saunders|June 20, 2014|DAILY BEAST
At the same moment the door was thrown open, and Mrs. Gordon appeared on the threshold with a gentleman behind her.
Confidence|Henry James
In the midst of these meditations, the dungeon door opened, and Santa Cruz himself appeared on the threshold.
The Pastor's Fire-side Vol. 3 of 4|Jane Porter
That last moment, as she stepped lightly over the threshold of the library, was a sort of climax to the intoxication of youth.
Ancestors|Gertrude Atherton
Pausing at the threshold before opening the door, the sonorous mumble sounding through the deal panels misled me.
The Soldier of the Valley|Nelson Lloyd
She knew he had divined the one thing she had most dreaded in returning,—the crossing again the threshold of her own room.
Ramona|Helen Hunt Jackson