Why is gallium arsenide (GaAs) useful for semiconductor devices operating at UHF and higher frequencies?
The correct answer is B: Higher electron mobility. Why is gallium arsenide (GaAs) useful for semiconductor devices operating at UHF and higher frequencies is that it has higher electron mobility. Higher electron mobility allows faster operation at high frequencies. For amateur radio operators, this is important for semiconductor knowledge. Understanding this helps when selecting semiconductors.
Exam Tip
GaAs useful at UHF+ = higher electron mobility. Think 'G'aAs = 'G'ood 'A't high frequency (higher mobility). Higher electron mobility allows faster operation at high frequencies. Not higher noise, not lower junction voltage, not lower transconductance - just higher electron mobility.
Memory Aid
"GaAs useful at UHF+ = higher electron mobility. Think 'G'aAs = 'H'igher 'M'obility. Higher electron mobility allows faster operation at high frequencies. Important for semiconductor knowledge."
Real-World Application
Gallium arsenide (GaAs) for semiconductor devices operating at UHF and higher frequencies: It's useful because of higher electron mobility. Electrons move faster in GaAs, allowing devices to operate at higher frequencies. This is the reason - higher electron mobility.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Higher noise figures isn't an advantage - GaAs has higher electron mobility. Higher noise isn't the reason.
Option C: Incorrect. Lower junction voltage drop isn't the reason - GaAs has higher electron mobility. Junction voltage isn't the reason.
Option D: Incorrect. Lower transconductance isn't the reason - GaAs has higher electron mobility. Lower transconductance isn't the reason.
题目解析
The correct answer is B: Higher electron mobility. Why is gallium arsenide (GaAs) useful for semiconductor devices operating at UHF and higher frequencies is that it has higher electron mobility. Higher electron mobility allows faster operation at high frequencies. For amateur radio operators, this is important for semiconductor knowledge. Understanding this helps when selecting semiconductors.
考试技巧
GaAs useful at UHF+ = higher electron mobility. Think 'G'aAs = 'G'ood 'A't high frequency (higher mobility). Higher electron mobility allows faster operation at high frequencies. Not higher noise, not lower junction voltage, not lower transconductance - just higher electron mobility.
记忆口诀
GaAs useful at UHF+ = higher electron mobility. Think 'G'aAs = 'H'igher 'M'obility. Higher electron mobility allows faster operation at high frequencies. Important for semiconductor knowledge.
实际应用示例
Gallium arsenide (GaAs) for semiconductor devices operating at UHF and higher frequencies: It's useful because of higher electron mobility. Electrons move faster in GaAs, allowing devices to operate at higher frequencies. This is the reason - higher electron mobility.
错误选项分析
Option A: Incorrect. Higher noise figures isn't an advantage - GaAs has higher electron mobility. Higher noise isn't the reason. Option C: Incorrect. Lower junction voltage drop isn't the reason - GaAs has higher electron mobility. Junction voltage isn't the reason. Option D: Incorrect. Lower transconductance isn't the reason - GaAs has higher electron mobility. Lower transconductance isn't the reason.
知识点
Gallium arsenide, GaAs, Semiconductor devices, UHF and higher frequencies, Higher electron mobility
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.