Question

1) True or false? : The driving force for unsteady state diffusion is a constant mass...

1) True or false? : The driving force for unsteady state diffusion is a constant mass concentration gradient.

2) True of false? Carbon diffuses faster in Cu than in iron.

Engineering   Mechanical-Engineering   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

1)False

In unsteady state of mass diffusion due to turbulent mixing the mass consentration at a particular point changes with time,this in turn changes the diffusion flux with time.So statement is false.

2)False

For Solid state diffusion size is the most important factor,and in case of interstitial diffusion the interatomic spacing is most important in which an interstitial atom fits.In case of C and Fe the interstitial spacing of the Fe lattice is nearly of same size of the carbon atom so diffusion in Fe lattice is much easier.This is not the case with Cu lattice.

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
1. Briefly explain the difference between self-diffusion and interdiffusion. 2. (a) Compare interstitial and vacancy atomic...
1. Briefly explain the difference between self-diffusion and interdiffusion. 2. (a) Compare interstitial and vacancy atomic mechanisms for diffusion. (b) Cite two reasons why interstitial diffusion is normally more rapid than vacancy diffusion. 3. A sheet of BCC iron 2 mm thick was exposed to a carburizing gas atmosphere on one side and a decarburizing atmosphere on the other side at 675�C. After reaching steady state, the iron was quickly cooled to room temperature. The carbon concentrations at the two...
11. The driving force for the formation of BIOMES is water temperature. a. True b. False
11. The driving force for the formation of BIOMES is water temperature. a. True b. False
A sinusoidally carrying driving force is applied to a damped harmonic oscillator of force constant k...
A sinusoidally carrying driving force is applied to a damped harmonic oscillator of force constant k and mass m. If the damping constant has a value b1, the amplitude is A1 when the driving angular frequency equals ?(k/m) . In terms of A1, what is the amplitude for the same driving frequency and the same driving force amplitude Fmax, if the damping constant is (a)3b1 and (b)b1/2? The oscillator is now at the resonace condition. If the damping constant b...
true or false questions 1. A body can have mass, but experience zero weight force. 2....
true or false questions 1. A body can have mass, but experience zero weight force. 2. The force due to air resistance always opposes the direction of motion.
Identify if the statements are true or false 1. Hydrogen ions enter the mitochondrial matric via...
Identify if the statements are true or false 1. Hydrogen ions enter the mitochondrial matric via facilitated diffusion (faciliated transport) 2. The pH in the mitochondrial matric is lower than the pH in the intermembrane space 3. Energy is generated as a result of the difference in hydrogen ion concentration between the intermembrance space and the cytoplasm 4. ATP synthase provides energy in the form of ATP to actively transport H+ into the mitochondrial matrix 5. Hydrogen ion concentration is...
Answer the following questions True or False. Write “True” or “False” in the blank. 1._________   The...
Answer the following questions True or False. Write “True” or “False” in the blank. 1._________   The rate constant changes if the concentrations of the reactant change. 2._________   If the concentration of a reactant changes, the rate of the reaction always changes. 3._________   The coefficients of the overall reaction tell us the order for each reactant. 4._________   The half-life for a first order reaction does not depend on the initial concentration. 5._________   If the rate of a reaction over a long...
1. The maximum weight percentage of carbon atoms (which are very small atoms) that can be...
1. The maximum weight percentage of carbon atoms (which are very small atoms) that can be contained in spaces between the iron atoms in a crystal of face-centered cubic iron at 1333 deg F (723 degC) is 0.8%C. (a) To what approximate atomic percentage does this correspond? (b) On the average, how many unit cells of face-centered cubic iron would have to be examined before encountering a carbon atom? 2. (a) Briefly explain the concept of driving force. (b) What...
true or false questions: 1. If a normal force is acting on a body, the normal...
true or false questions: 1. If a normal force is acting on a body, the normal force will never be in the direction that the body is moving. 2. A body can experience a weight force and have no mass. 3. During a one-hour trip, a small boat travels 80.0 km north and then travels 60.0 km east. The average velocity of the boat was 100 km/h. 4. A body undergoing projectile motion will always have a constant acceleration.
Questions : state which of the following statements are TRUE and which are FALSE, by writing...
Questions : state which of the following statements are TRUE and which are FALSE, by writing question number, followed by the a capital “T” for true, and “F” for false: i Sherwood number in Mass Transfer is analogous to Prandtl number in Heat Transfer ii. The analogy with fluid flow friction applies equally well to Mass Transfer as to Heat Transfer iii. The Land pan evaporation equation takes into account convection effects iv. Ficks law in mass transfer expresses molecular...
A harmonic oscillator with mass m and force constant k is in an excited state that...
A harmonic oscillator with mass m and force constant k is in an excited state that has quantum number n. 1) Let pmax=mvmaxx, where vmax is the maximum speed calculated in the Newtonian analysis of the oscillator. Derive an expression for pmax in terms of n, ℏ, k, and m. Express your answer in terms of the variables n, k, m, and the constant ℏ 2) Derive an expression for the classical amplitude A in terms of n, ℏ, k,...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT