Why was Townes’s early work with stimulated emissi...

Câu hỏi: Why was Townes’s early work with stimulated emission done with microwaves?

A He was not concerned with light amplification.

B It was easier to work with longer wavelengths.

C  His parents Schawlow had already begun work on the laser.

D The laser had already been developed.

Câu hỏi trên thuộc đề trắc nghiệm

Đề luyện thi Đánh giá năng lực môn Anh - số 4