According to paragraph 3, when does an atom produce light? A. When it has more electrons than its electron shells can hold B. When an electron drops back to its original electron shell C.

13 29/09/2024

According to paragraph 3, when does an atom produce light?

A. When it has more electrons than its electron shells can hold

B. When an electron drops back to its original electron shell

C. When an electron is transferred from one atom to another

D. When energy is added to the outermost electron shell

Trả lời

Theo đoạn 3, khi nào một nguyên tử sản sinh ra ánh sáng?

A. Khi nó có nhiều electron hơn vỏ electron nó có thể giữ

B. Khi một electron rơi trở lại vỏ electron ban đầu của nó.

C. Khi một electron được chuyển từ một nguyên tử này đến nguyên tử khác.

D. Khi năng lượng được thêm vào vỏ electron ngoài cùng

Dẫn chứng: When the electrons drop back down to their natural shell, they emit light .

=>Chọn B

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Xem tất cả

According to paragraph 3, when does an atom produce light? A. When it has more electrons than its electron shells can hold B. When an electron drops back to its original electron shell C.

Trả lời

Câu hỏi cùng chủ đề

______ is over your head is just an exaggeration because you have well prepared for it over the years. A. This entrance exam B. What this entrance exam C. That this entrance exam D. It i

He built up a successful business but it was all done ______ of his health. A. at the price B. by the expense C. at all cost D. at the expense

If I weren’t afraid of travelling by air, I ______ to go to American by ship, which took me much longer time. A. I hadn’t had B. I wouldn’t have had C. I shouldn’t have had D. I wouldn’t h

There are ______ that not only governments but also individuals should join hand to tackle. A. too numerous environmental problems B. such a lot of environmental problems C. so fewer envir

______ irritating they are, you shouldn’t lose temper with small children. A. No matter how much B. As much as C. However D. Although

You should accept the Nokia mobile phone as a 16–birthday present from your parents delightedly. Don’t ______. A. look gift horse in the mouth B. buy it through the nose C. pull my leg D

Your sister has lost an awful lot of weight. She must have been on a diet, ______? A. mustn’t she B. needn’t she C. haven’t she D. hasn’t she

Just as you arrived, I ______ ready to go out. A. have got B. was getting C. would get D. have been getting

The press thought the sale manager would be depressed by his dismissal but he just ______. A. turned it down B. called it off C. spoke it out D. laughed it off

British Leyland is aiming to push ______ its share of UK car sale to 25% over the next two years. A. on B. up C. through D. out

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