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【单选题】
2020年初，新冠肺炎疫情突发，中华儿女风雨同舟、守望相助。图中志愿者用非接触式红外体温计测量人体温度，通过人体辐射的红外线测量体温。关于红外线下列说法正确的是（ ）。
A.
红外线的光子能量比紫外线的大
B.
真空中红外线的传播速度比紫外线的大C,真空中红外线的波长比紫外线的长D.当人体温度超过37.3
时人体才辐射红外线
时人体才辐射红外线
参考答案：
参考解析：
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