Answer:
The appropriate alternative is option C "".
Explanation:
The given value is:
Energy of photon,
E =
As we know,
h =
Now,
The frequency of the light will be:
⇒
On substituting the given values, we get
⇒
On solving, we get
⇒
The best answer to report is 2.900 g/ml (answer A)
explanation
The best answer to report must be in four significant figures. 2.900 g/ml is therefore the best answer to report since in is in four significant. zeros placed after other digits but behind a decimal point are significant figures.,theerfore 2.900 has four significant figures
The freezing point depression is a colligative property which means that it is proportional to the number of particles dissolved.
The number of particles dissolved depends on the dissociation constant of the solutes, when theyt are ionic substances.
If you have equal concentrations of two solutions on of which is of a ionic compound and the other not, then the ionic soluton will contain more particles (ions) and so its freezing point will decrease more (will be lower at end).
In this way you can compare the freezing points of solutions of KCl, Ch3OH, Ba(OH)2, and CH3COOH, which have the same concentration.
As I explained the solution that produces more ions will exhibit the greates depression of the freezing point, leading to the lowest freezing point.
In this case, Ba(OH)2 will produce 3 iones, while KCl will produce 2, CH3OH will not dissociate into ions, and CH3COOH will have a low dissociation constant.
Answer: Then, you can predict that Ba(OH)2 solution has the lowest freezing point.
The lewis structure is helpful in showing how the bonding between atoms of a molecule are. The lewis structure of ammonia would be that the nitrogen atom will share three pairs of electron with the three hydrogen atoms leaving nitrogen to have 1 lone pair.<span />
The question is another language. Translation in English language is as following:
What are the common sensors that can be used to identify metal, gas or liquid?
Answer:
<u>Common sensors that can be used to identify metal, gas or liquid are as following:</u>
- Inductive Proximity Sensor: Inductive proximity sensors are able to detect metals only. It generates output signal or electrical signal when any metal object come nearby its sensing area.
- Handheld flammable gas detectors: they are commonly used to detect gas leakage such as natural gas lines, butane tanks, or any other combustible gas.
- Optical level sensors: this sensor is used to detect liquids including the interface between two immiscible liquids and the occurrence of sediments.