A:红色光谱线是氢原子从n=6能级到n=2能级跃迁时产生的
B:两条紫色光谱线是氢原子从n=6和n=5能级向n=2能级跃迁时产生的
C:若从n=6能级跃迁到n=1能级将产生红外线
D:若从n=6能级跃迁到n=2能级所辐射的光子不能使某金属产生光电效应,则从n=6能级向n=3能级跃迁时辐射的光子将可能使该金属产生光电效应
① How many books do you have?____ A. I bought a lot of books.
② What are the rabbits doing?____ B. They are onions.
③ Can you play the piano? ____ C. I have twenty books.
④ What did you do last Sunday? ____ D. They are jumping.
⑤ What are these?____ E. Yes, I can.