本题目来源于试卷: Physics Unit27: Early Quantum Theory and Models of the Atom，类别为 Generic Physics
[单选题]
What is a photon?
A. an electron in an excited state
B. a small packet of electromagnetic energy that has particle-like properties
C. one form of a nucleon, one of the particles that makes up the nucleus
D. an electron that has been made electrically neutral
参考答案: B
本题详细解析:
暂无
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Post time 2024-1-22 00:41:22