Question: What American physicist discovered the positron which explained Chinese physicist Chung-Yao Chao's earlier experiments with gamma rays?
Sentence (from "Ultra-high-energy gamma ray"): They have a frequency higher than 2.42 × 10 Hz and a wavelength shorter than 1.24 × 10 m. s of 2014 , they are theoretical only and have not been detected.
Relevant evidence: No