19 When alpha particles are incident on a thin metal foil, most of them pass through undeviated. What does this observation reveal about the nature of the atom?
A
The atom has a dense nucleus.
B
The atom is mostly empty space.
С
The atom is very small.
The nucleus of the atom is positively charged.
D

Complete the sentence to describe the law of conservation of energy. the law of conservation of energy states that energy cannot be created or , but it can be

What is created when solids,liquids,an gases mix with one another

Starting with only the balmer series light (visible light), how could we ensure that the solar panels generate a current that mark can use for his power station? a)by gradually increasing the brightness (amount) of light that we shine on it. b)by gradually increasing the frequency of the light we shine on it. c)by gradually increasing the wavelength of the light that we shine on it.