# Solving a Homework Equation: ΔV_H

• Turion
In summary, ΔV_H represents the change in volume of a substance at a constant pressure and temperature, typically measured in cubic meters (m^3). To solve for ΔV_H, the equation ΔV_H = V_f - V_i can be used, where V_f is the final volume and V_i is the initial volume. It is important to check the units given in the equation and convert if necessary. ΔV_H can be negative if the final volume is smaller than the initial volume, indicating a decrease in volume. ΔV_H is often related to other variables, such as pressure and temperature, through equations such as the ideal gas law. Understanding this relationship is crucial for correctly solving for ΔV_H in a homework equation.

## The Attempt at a Solution

$$Δ{ V }_{ H }=\frac { IB }{ nqt } \\ 9.6*{ 10 }^{ -6 }=\frac { 50*1.3 }{ n*e*3.3*{ 10 }^{ -4 } } \\ n=1.28*{ 10 }^{ 29 }\quad electrons/{ m }^{ 3 }$$

You can use WolframAlpha to check calculations like that.

mfb said:
You can use WolframAlpha to check calculations like that.

I thought the method was wrong because it gives us d=1mm but we don't use it in our calculations.

I'm not sure where the Hall voltage is measured, either 0.330mm or 1mm is not necessary.

Take a look at the Hyperphysics web page on the Hall Effect.

## 1. What does ΔV_H represent in a homework equation?

ΔV_H is the change in volume of a substance, typically measured in cubic meters (m^3), at a constant pressure and temperature.

## 2. How do I solve for ΔV_H in a homework equation?

To solve for ΔV_H, you will need to use the equation ΔV_H = V_f - V_i, where V_f is the final volume and V_i is the initial volume.

## 3. What units should I use for ΔV_H in a homework equation?

ΔV_H is typically measured in cubic meters (m^3), but it is important to check the units given in the equation and convert if necessary.

## 4. Can ΔV_H be negative in a homework equation?

Yes, ΔV_H can be negative if the final volume is smaller than the initial volume. This indicates that the substance has undergone a decrease in volume.

## 5. How is ΔV_H related to other variables in a homework equation?

ΔV_H is often related to other variables, such as pressure and temperature, through equations such as the ideal gas law. It is important to understand the relationship between these variables in order to correctly solve for ΔV_H.