Which statement is true regarding process 4 in the diagram...

Name: Problem 68, Chapter 0: Physics SAT Subject Test
Uploaded: 2021-04-22T17:46:44-08:00
Duration: 3 min 32 s
Channel: Vishal Gupta
Description: Which statement is true regarding process 4 in the diagram above? (A) This occurs at the boiling point of the substance. (B) Process 4 is dependent on the latent heat of vaporization. (C) The temperatre cannot rise until the phase change is completed. (D) The process involves a liquid/gas phase change. (E) All of the above are correct.

Which statement is true regarding process 4 in the diagram above? (A) This occurs at the boiling point of the substance. (B) Process 4 is dependent on the latent heat of vaporization. (C) The temperatre cannot rise until the phase change is completed. (D) The process involves a liquid/gas phase change. (E) All of the above are correct.

Which statement is true regarding process 4 in the diagram above?
(A) This occurs at the boiling point of the substance.
(B) Process 4 is dependent on the latent heat of vaporization.
(C) The temperatre cannot rise until the phase change is completed.
(D) The process involves a liquid/gas phase change.
(E) All of the above are correct.

Key Concepts

Phase Change

A phase change is the process by which a substance transitions from one state (solid, liquid, or gas) to another. During this process, added energy is used to change the structure of the substance rather than increasing its temperature. This characteristic helps explain why the temperature remains constant even when heat is added during the transition.

Latent Heat

Latent heat is the energy required for a substance to undergo a phase change without changing its temperature. Specifically, the latent heat of vaporization is the energy needed to convert a liquid to a gas, and it plays a crucial role during the boiling process by absorbing the energy that would otherwise increase the temperature.

Boiling Point

The boiling point is the temperature at which the vapor pressure of a liquid equals the surrounding atmospheric pressure. At this temperature, a liquid begins to transition to a gaseous state, and any further addition of heat is used to drive this phase change rather than to raise the temperature.

Heating Curve

A heating curve represents the relationship between the temperature of a substance and the heat added to it. It typically shows regions of temperature increase interspersed with flat segments where phase changes occur. During these flat segments, also known as plateaus, the temperature remains constant as the substance absorbs latent heat.

Transcript

00:01 High in the given problem there is a variation in the temperature of an object with the heat added to it.

00:15 Heat added is being represented on the x -axis and change in temperature is being represented on the y -axis.

00:27 Now, initially, when the temperature is increasing, the heat is being supplied to the substance, and this is the process one which may represent the solid state of the substance.

00:43 Now the change of state takes place here in the process two when the temperature becomes constant and this solid is being converted into the liquid.

00:57 Now it has been converted into the liquid completely so again the temperature starts increasing and heat is continuously being supplied now in the process 4 which is actually concerned in this problem this is process 4 in this process 4 the state is liquid the liquid is being converted into the gaseous state so the temperature is constant and this state in this state the heat being supplied will be dependent on the latent heat only now after which the process five in which again the temperature will start increasing we have to find out the correct option now here the first option says this occurs means process 4 for the process 4 statement a says this occurs at boiling point of the substance yes this is true as the liquid is being converted to gas so this is the boiling process so this is true statement b says process 4 is dependent on the latent heat yes when the liquid is being converted into the gas the heat supplied will be given by q is equal to m into l where l is the latent heat so process 4 is dependent on the latent heat of vaporization so this statement is also true now statement c says the temperature cannot rise until the phase change is completed yes temperature will remain constant and it will again start changing when whole of the liquid will be converted into the gas so this this is also true...

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