英文化学字谜6.Element found in white jewelry and also used when a

song_zh2022-10-04 11:39:543条回答

英文化学字谜
6.Element found in white jewelry and also used when a wire must be sealed in a glass tube as it expands and contracts at about the same rate as glass.（8个字母）
7.Element used as a dye and as a tincture solution in medicine.（6个字母）
9.Element used in electroplating and also in coins of small denominations.（6个字母）
6是铂，7是碘，9是什么啊

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这是物理问题吧
1) Springfield's "classic rock" radio station broadcasts at a frequency of 102.1 MHz.What is length of radio wave in meters?
某电台频率是102.1兆赫兹,求波长
102.1*10^6=v/l=3*10^8/l
波长l=2.94 m
2) A beam of light has a wavelength of 506 nanometers.What is the frequency of the lights?
某种光波长506纳米,求频率
频率=光速/波长=3*10^8/(506*10^-9)=5.93*10^14 HZ
3)Blue light has a frequency of 6.89X10^14 Hertz.calculate the wavelength of blue light in nanometers.
蓝光频率6.89*10^14赫兹,求波长为多少纳米
波长=光速/频率=3*10^8/(6.89*10^14)=435.4 nm

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英文化学字谜6.Element found in white jewelry and also used when a

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