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Very small amount we can detect? photon

alpha2cen
in Modern and Theoretical Physics

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Very small scale detection, how can we make?

About visible light photon detection.

Without amplification, how small amount of photon can we detect?

Photon might hit electrons on the solid surface and make free electrons.

At that time we have to consider lower limit of photon energy and photon number.

Produced electric current and voltage should be sufficient to detect.

The lower limit?

Edited by alpha2cen

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