What Is the Cutoff (Threshold) Frequency for a Metal Surface $5.42 \mathrm { eV }$

question 187

Multiple Choice

What is the cutoff (threshold) frequency for a metal surface that has a work function of $5.42 \mathrm { eV }$ ? (1 $\left. \mathrm { eV } = 1.60 \times 10 ^ { - 19 } \mathrm {~J} , h = 6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s } \right)$

• A) \(1.31 \times 10 ^ { 15 } \mathrm {~Hz}\)
• B) \(5.02 \times 10^{15} \mathrm {~Hz}\)
• C) \(3.01 \times 10^{15} \mathrm {~Hz}\)
• D) \(6.04 \times 10^{15} \mathrm {~Hz}\)
• E) \(2.01 \times 10^{15} \mathrm {~Hz}\)

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Definitions:

Negative Reinforcer

A stimulus that, when removed after a behavior, increases the likelihood of that behavior being repeated in the future.

Primary Reinforcer

Any reinforcer that is naturally reinforcing by meeting a basic biological need, such as hunger, thirst, or touch.

Fixed-Ratio Schedule

A fixed-ratio schedule is a type of operant conditioning reinforcement schedule where a response is reinforced only after a specified number of responses.

Variable-Ratio Schedule

A reinforcement schedule in which a response is reinforced after an unpredictable number of responses, leading to high and steady response rates.