A Surface Is Examined Using a Scanning Tunneling Microscope (STM)

question 67

Multiple Choice

A surface is examined using a scanning tunneling microscope (STM) .For the range of the working gap,L,between the tip and the sample surface,assume that the electron wave function for the atoms under investigation falls off exponentially as .The tunneling current through the STM tip is proportional to the tunneling probability.In this situation,the ratio of the current when the STM tip is 0.465 nm above a surface feature to the current when the tip is 0.425 nm above the surface is

• A)0.336
• B)0.301
• C)0.314
• D)0.408
• E)0.671

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Definitions:

Return On Investment

A financial ratio measuring the profit earned on an investment relative to its cost, indicating the efficiency of the investment.

Turnover

The rate at which inventory or assets are replaced through sales or use within a given period.

Net Operating Income

A company’s income after operating expenses are subtracted, but before income taxes and interest are calculated.

Residual Income

The amount of income that an individual has after all personal debts, including the mortgage, have been paid.