For a certain device (that can be used as a detector of optical radiation) we fabricate a coupled well structure, where electrons sitting inside GaAs layers see the interface with AlGaAs layer as a potential barrier of height . Assume that the width of the GaAs wells is , while the width of the barrier is  the mass of electrons inside GaAs is mGaAs=0.067 , mass of AlGaAs=0.092 . where  is s the mass of the free electron.  

Now consider the system of two wells . Derive an equation for energies of the bound states in this system, applying boundary conditions at each interface (you will end up with 8 equations). But if you choose the origin of the coordinate system at the center of the AlGaAs barrier, you can use the symmetry arguments and consider odd and even solutions separately, which will reduce the number of equations to four for solutions of each parity. Find discrete energy levels using first graphing method,

 

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For a callablebond ytm is more conservative measure of yield fro  the point of view of the investor, whenever

A. The bond is priced at or above its call price

B. The bond is trading for more than par but less than the call price

C. The bond is trading at less than par

D. None off the above

 

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For a business that makes advance provision for uncollectible receivables (a) Journalize the entries to record the following: (1) Record the adjusting entry at December 31, the end of the fiscal year, to provide for doubtful accounts. The accounts receivable account has a balance of $800,000, and the contra asset account before adjustment has a debit balance of $600. Analysis of the receivables indicates doubtful accounts of $20,000. (2) In March of the following fiscal year, the $550 owed by Flake Co. on account is written off as uncollectible. (3) Eight months later, $200 of the Flake Co. account is reinstated and payment of that amount is received. (4) In October, $400 is received on the $600 owed by Doe Co. and the remainder is written off as uncollectible. (b) Based on the data in (a) (1) above, what is the net realizable value of the accounts receivable as reported on the balance sheet as of December 31? (c) Assuming that the business had been following the direct write-off procedure in accounting for uncollectible receivables, journalize the entries to record the following: (1) Recorded the write-off of account of Flake Co. [(a) (2) above]. (2) Reinstated account of Flake Co. for $200 and recorded payment of that amount received [(a) (3) above]. (3) Recorded the receipt of $400 from Doe Co. in (a) (4) above and wrote off the remainder owed as uncollectible

 

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For a 8051 microcontroller, program to display 99-00 (two-digit decimal down counter) on the LCD screen whenever a switch is on. Counting needs to stop as soon as switch is off. Use one second delay between increments. Also, when counting starts, display “Start Count” on the PC screen (TeraTerm Window) and when counting stops display “Stop Count” on the PC screen.

 

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For a confidence interval for population parameter (e.g. the population mean) computed at a 95% confidence level, what proportion of all possible confidence intervals will contain the true parameter value? Enter answer with 2 decimal places.

 

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