Which is equal to 28400 kHz?
The correct answer is D: 28.400 MHz. 28400 kHz equals 28.400 MHz. To convert kilohertz to megahertz, divide by 1,000. The prefix 'kilo-' means one thousand, and 'mega-' means one million, so 1,000 kHz = 1 MHz.
28,400 kHz ÷ 1,000 = 28.4 MHz. This is a standard frequency conversion. 28.400 MHz is in the 10-meter amateur band. Understanding these conversions is essential for frequency calculations and band identification. Both notations (28400 kHz and 28.400 MHz) are correct, but MHz is more commonly used for this frequency range.
Exam Tip
kHz to MHz = Divide by 1000. Remember: To convert kilohertz to megahertz, divide by 1,000. 28,400 kHz ÷ 1000 = 28.400 MHz.
Memory Aid
"**k**Hz **T**o **M**Hz = **D**ivide **T**housand (think 'kTM = DTM' = Divide Thousand, ÷ 1000)"
Real-World Application
The 10-meter amateur band includes frequencies around 28.400 MHz, which can also be expressed as 28,400 kHz. Both are correct, but MHz is more commonly used. Understanding that 28,400 kHz = 28.400 MHz helps when working with frequency specifications that might use different units.
FCC Part 97.303Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. 28.400 kHz equals 0.0284 MHz, not 28.400 MHz. You divided by 1,000,000 instead of 1,000.
Option B: Incorrect. 2.800 MHz equals 2,800 kHz, not 28,400 kHz. You're off by a factor of 10.
Option C: Incorrect. 284.00 MHz equals 284,000 kHz, not 28,400 kHz. You multiplied instead of dividing.
题目解析
The correct answer is D: 28.400 MHz. 28400 kHz equals 28.400 MHz. To convert kilohertz to megahertz, divide by 1,000. The prefix 'kilo-' means one thousand, and 'mega-' means one million, so 1,000 kHz = 1 MHz. 28,400 kHz ÷ 1,000 = 28.4 MHz. This is a standard frequency conversion. 28.400 MHz is in the 10-meter amateur band. Understanding these conversions is essential for frequency calculations and band identification. Both notations (28400 kHz and 28.400 MHz) are correct, but MHz is more commonly used for this frequency range.
考试技巧
kHz to MHz = Divide by 1000. Remember: To convert kilohertz to megahertz, divide by 1,000. 28,400 kHz ÷ 1000 = 28.400 MHz.
记忆口诀
**k**Hz **T**o **M**Hz = **D**ivide **T**housand (think 'kTM = DTM' = Divide Thousand, ÷ 1000)
实际应用示例
The 10-meter amateur band includes frequencies around 28.400 MHz, which can also be expressed as 28,400 kHz. Both are correct, but MHz is more commonly used. Understanding that 28,400 kHz = 28.400 MHz helps when working with frequency specifications that might use different units.
错误选项分析
Option A: Incorrect. 28.400 kHz equals 0.0284 MHz, not 28.400 MHz. You divided by 1,000,000 instead of 1,000. Option B: Incorrect. 2.800 MHz equals 2,800 kHz, not 28,400 kHz. You're off by a factor of 10. Option C: Incorrect. 284.00 MHz equals 284,000 kHz, not 28,400 kHz. You multiplied instead of dividing.
知识点
Frequency conversion, Kilohertz, Megahertz, Unit conversion
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.