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Atomic electrons have specific allowed energy
states. Why?
原子电子具有特定的允许能级。为什么？
If atoms occupy only certain allowed levels, how
do they get from one allowed level to another?
如果原子只能占据特定的能级，它们如何从一个能级跃迁到另一个能级？
Why do atoms emit or absorb only certain specific
colors of light?
为什么原子只能发射或吸收特定颜色的光？
How can you tell that there is calcium in the atmosphere
of the star Betelgeuse, which is about 310 light years
away from the earth?
如何判断参宿四星大气中有钙存在？该星距离地球约310光年。
How do you determine the temperature of a hot
object using the blackbody radiation curve?
如何利用黑体辐射曲线确定一个热物体的温度？
How do you determine the temperature of a star?
如何确定恒星的温度？
If an ambulance with a siren passes you, what do you observe about the pitch of the siren before and after it passes you?
如果一辆救护车的鸣笛声经过你，你会观察到鸣笛声的音调在它经过你之前和之后发生了什么变化？
What happens to the wavelength of a light source that is approaching you? receding from you?
当光源向你靠近或远离时，其波长会发生什么变化？
How do you identify hydrogen in a star that is moving with respect to you?
如何识别一颗相对于你运动的恒星中的氢？
What is the source of the energy which makes stars shine?
是什么能源使恒星发光？
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