Explain the red shift and Doppler effect

1 answer:

3 0

Red shift is a phenomenon where electromagnetic radiation from an object undergoes an increase in wavelength. doppler effect is an increase or decrease in the frequency of sound light or other waves as the source and observer move toward or away from each other. (i just did this in science)

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A chemist observes that a large molecule reacts as if it were much smaller. The chemist proposes that the molecule is folded in

nadezda [96]

Answer:

Hypothesis

Explanation:

The following steps are applicable when we wish to prove a specific fact:

a hypothesis is made; this is a statement that we provide after some observations and we wish to either prove or deny it;
multiple experiments are carried out in order to gather significantly substantial amount of data that can be then further analyzed and any tendencies can be noticed;
based on the data gathered, conclusions are made: we either prove or deny the hypothesis. If hypothesis is proved, it may become a theory over long time.

In the context of this problem, we're at the first step where we make a hypothesis.

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3 years ago

All of the deer, grass, maple trees, and owls in a forest would be considered a

Alexxx [7]

A habitat because it has animals and trees

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3 years ago

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White phosphorus is composed of tetrahedral molecules of P4 in which every P atom is connected to three other P atoms. In the Le

Dmitrij [34]

Answer:

In the Lewis structure of P4 there are 6 bonding pairs and 4 lone pairs of electrons.

Explanation:

The structure of tetrahedral molecule of P4 is provided below.

Each phosphorus atom has 5 valence electrons out of which 3 electrons involve in bonding and the rest 2 electrons exist as a lone pair that does not involve in bonding.Hence each phosphorus atom has one lone pair.In P4 molecule there are phosphorus atoms and hence 4 lone pairs in total.

As you can see in the figure, each phosphorus atom is bonded to the other three atoms.A bond is formed when two atoms share one electron each and the pair is called bonding pair.

From the figure we can see that there are 6 bonds in total.Each bond consist of one bonding pair of electrons and hence in total there are 6 bonding pairs of electrons.

Hence in a P4 molecule there are six bonding pairs and 4 lone pairs of electrons.

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3 years ago

How many half-lives are required for three-fourths of the nuclei of an isotope in a sample to decay?

prisoha [69]

2 half lives are required.

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3 years ago

Consider the following electronegativity values:

luda_lava [24]

Answer: option C. HF

Explanation: A polar bond is a covalent bond between two atoms where the electrons forming the bond are unequally distributed. Fluorine is more electronegative than hydrogen so the electrons in the bond are more closely associated with the fluorine atom than with the hydrogen atom.

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4 years ago