According to Albert Einstein's theory of photoelectric effect, metals will only emit electrons when the incident light has a frequency that is above the minimum or threshold frequency.
So if the frequency of the incident light is less than the threshold frequency then electrons will not be emitted from that metal.
D. infrared waves.
The infrared waves are hard to detect, so it is hard to detect where the soldiers are at night
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Answer: Protons
The atom in a sample of an element must contain nuclei with the same number of protons. If the protons change in number, then the element will modify as well.
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Well when you would "get rid of" the water it would eventually be led to some ocean, pond, lake, etc. There it would eventually evaporate, rising up to the sky. This is where it would move around with clouds until it rained again.
