Question: A temperature of about 0.01 K can be achieved by magnetic cooling. In this process a strong magnetic field is imposed on a paramagnetic salt,

A temperature of about 0.01 K can be achieved by magnetic cooling. In this process a strong magnetic field is imposed on a paramagnetic salt, maintained at 1 K by transfer of energy to liquid helium boiling at low pressure. The salt is then thermally isolated from the helium, the magnetic field is removed, and the salt temperature drops. Assume that 1 mJ is removed at an average temperature of 0.1 K to the helium by a Carnot-cycle heat pump. Find the work input to the heat pump and the coefficient of performance with an ambient at 300 K.

Step by Step Solution

★★★★★

3.40 Rating (150 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

TL 01 BQWINTT2999 000033 ... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

E-ME-T (825).docx

120 KBs Word File

Students Have Also Explored These Related Mechanical Engineering Questions!

A temperature of about 0.01 K can be achieved by magnetic cooling, (magnetic work was discussed in Problems 4.41 and 4.42). In this process a strong magnetic field is imposed on a paramagnetic salt,...

A stock split can be achieved by means of a stock dividend. Do you agree? Explain.

The surface of the Sun has a temperature of about 6000 K. What is the speed of a typical hydrogen molecule in the Suns atmosphere?

Magnetic Work and Cooling due to Adiabatic Demagnetization: Debye, in 1926, suggested that much lower temperatures can be obtained by adiabatic demagnetization of a paramagnetic salt i.e., the...

Consider a paramagnetic salt with a Debye temperature (Chapter) of 100K. A magnetic field of 100kG or 10tesla is available in the laboratory Estimate the temperature to which the salt must be...

The lowest temperature that has been achieved is about 1 106 K. To achieve this an additional stage of cooling is required beyond that described in the previous problem, namely nuclear cooling. This...

The lowest temperature that has been achieved is about 1 106 K. To achieve this an additional stage of cooling is required beyond that described in the previous problem,...

Hi 23. A sample of paramagnetic salt contains 2.0 x 1024 atomic dipoles each of dipole moment Pa 1.5 x 10-23 JT!. The sample is placed under a homogeneous magnetic field of 0.64 T, and cooled to a...

5.10 A paramagnetic salt whose magnetic ions have spin is at a temperature of 0.6 K in a magnetic field of 4 tesla. The field is slowly reduced to 6103 tesla, the salt being thermally isolated during...

The Maryville Construction Company occupies 85,000 square feet for construction of mobile homes. There are two manufacturing departments, finishing and assembly, and four service departments labeled...

Consider two particles of equal mass m. The forces on the particles are F1 = 0 and F2 = F0i. If the particles are initially at rest at the origin, what is the position, velocity, and acceleration of...

A left Riemann sum with n = 5 subintervals is used to approximate the area under the curve of f ( x ) = 3 x 2 + 2 4 x + 4 over the interval [ 2 , 3 ] . Is the approximation an underestimate or an...

Marshall-Miller & Company is considering the purchase of a new machine for $50,000, installed. The machine has a tax life of 5 years, and it can be depreciated according to the following rates....

Select a manufacturing organization for justifying "Companies with labor incentive manufacturing processes are most likely to benefit from sending manufacturing operations overseas because the bulk...

The Green Division of Sky Solutions Co. has developed a wind generator that requires a special "S" ball bearing. The Ball Bearing Division of Sky Solutions Co. has the capability to produce such a...

In a survey of 2344 adults, 727 say they believe in UFOS. Construct a 95% confidence interval for the population proportion of adults who believe in UFOS. A 95% confidence interval for the population...

Describe an organization you are familiar with respect to specific (5) events that could automatically be generated from an IT tool implemented on/in the organization IT infrastructure. Describe (2)...

Two positive numbers are such that the sum of 11 times the square of the first number and 13 times the cube of the second number is 395. If 218 is subtracted from 26 times the cube of the second...

The following gives information about the proportion of a sample that agree with a certain statement. Use StatKey or other technology to find a confidence interval at the given confidence level for...

You are to make monthly deposits of $425 into a retirement account that pays 10.6 percent interest compounded monthly. Required: If your first deposit will be made one month from now, how large will...

b Search this cour Assignment Activity: Chapter 11 Investment Planning Attempts 2,3 Keep the Highest 2374 14. Understanding limit and stop orders Understanding How Trade Orders Work Different trade...