Answer:
Due to how big the glacier is you would need more heat to melt it and since the ice cube is smaller a small amount of heat would melt it
Explanation:
The best option is a. but it is not complete!
Both liquids have different densities, it's true. But they are immiscible liquids and they don't form a solution.
Air is a mixture of gases (and some dust) because the gases (oxygen, nitrogen, carbon dioxide, etc.) do not combine chemically into other compounds. Just like a mixture of salt & pepper doesn't combine into some other thing.
The mixture is homogenous if it consists only of gases. If dust is mixed in the mixture is heterogeneous (dust is solid matter, gas is gas) A heterogenous mixture is one of different types of matter.
Separating one gas from the other is different for each gas and a complicated matter.
Answer:
Wave theory of light that states that visible light irrespective of its color, can cause the ejection of electrons when it strikes a metal.
Explanation:
Wave theory of light:
- If we go through wave theory of light, it clearly focuses that light is of actually wave nature not particle nature.
- The wave theory was based on the ideas of Hertz who discovered in 1887 that metallic surface can emit heat energy (electrons) when light hits the metal. If we increase the intensity of light, it will also increase the incident energy and ultimately increase the kinetic energy of electrons.
- Moreover, the frequency of light do not matters much, just a beam of light can eject the electrons from the metal.
Photoelectric effect:
On the other hand, Photoelectric effect can be considered only if we assume that light has particle like nature and not wave like nature.
- It also says that frequency of light matters alot in ejecting the electrons from the metals. If the frequency of light is less, it will not eject electrons from the metal surface even if it falls on metal for a very long time.
- It also says that maximum kinetic energy of the electrons (that are emitted) corresponds with the light frequency that caused the emission of electrons.
- The current of emitted electrons is directly proportional to the intensity of light that caused the electron emission.
We can see that the postulates of wave theory (like no.3) are just opposite to the postulates of photoelectric effect. The photoelectric effect also explained the relationship between emitted electrons and light in a better way that was not described by wave theory. We can say that it is as advanced explanation of facts based on the classical theory of wave like nature of visible light.
Answer:
Chlorine
Explanation:
Hello.
In this case, for the given elements, we are able to know that oxygen has 6 valence electrons, chlorine 7, nitrogen 5 and neon 8, therefore neon is not able to react as it already has 8 valence electrons. Besides, the element having the most valence electrons is chlorine and its reaction with hydrogen forms hydrogen chloride as shown below:
Therefore, the required element is chlorine.
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