Correct the following sentences. 下面的句子都有错误,请修改正确。Jack interested in music. Jack singing and dancing in the classroom. Is selfish. Only think himself.
红光的波长范围是多少?()
A. 390—780nm
B. 350—455nm
C. 622—760nm
D. 492—577nm
在单缝夫琅禾费衍射实验中,若增大缝宽,其他条件不变,则中央明条纹
A.宽度变小
B. 宽度变大.
C. 宽度不变,且中心强度也不变.
D. 宽度不变,但中心强度增大.