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A proton and an electron， both at rest initially， combine to form a hydrogen atom in the ground state.A single photon is emit- ted in this process.What is its wavelength？（）

A proton and an electron， both at rest initially， combine to form a hydrogen atom in the ground state.A single photon is emit- ted in this process.What is its wavelength？（）
A.91.2 nm
B.15 mm
C.49 fm
D.357 nm
正确答案：91.2 nm
标签：原子物理
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