An imaginary number is the product of a real number and the imaginary unit i, [note 1] which is defined by its property i2 = −1. [1][2] The square of an imaginary number bi is −b2. For example, 5i is an imaginary number, and its square is −25. The number zero is considered to be both real and imaginary. [3]

Iodine is a chemical element; it has symbol I and atomic number 53. The heaviest of the stable halogens, it exists at standard conditions as a semi-lustrous, non-metallic solid that melts to form a deep violet liquid at 114 °C (237 °F), and boils to a violet gas at 184 °C (363 °F).

2014年10月20日 · In general, the rule of sqrt (a)*sqrt (b) = sqrt (a*b) only works when a and b are both positive reals. That's not the case here. symbolipoint said: You will understand better when you study Trigonometry. More simply, we can have a solution for x 2 +1=0.

Iodine is a naturally occurring element found in sea water and in certain rocks and sediments. There are non radioactive and radioactive forms of iodine. Iodine is used as a disinfectant for cleaning surfaces and storage containers and is used …

2017年5月1日 · It is common to define i = (0, 1) i = (0, 1), and then i2 = −1 i 2 = − 1 is a theorem you can prove using the definition of complex multiplication. Presumably (a, b)(c, d) (a, b) (c, d) is defined to be (ac − bd, ad + bc) (a c − b d, a d + b c) somewhere prior to this theorem. This is the definition of multiplication in C C. Wgrenard.

双原子碘 （化学式 I2）是 碘 元素的存在形式，由两个碘 原子 组成。 在 标准情况 下，它是紫色 固体。 双原子碘会直接 升华，从固态变成 气态。 它具有 刺激性，必须小心处理。 和其他卤素一样，双原子碘可以与许多其他元素形成化合物。 然而，它的反应性小于较轻的卤素，例如 氟气 和 氯气。 双原子碘与 氢气 反应，形成 碘化氢： 双原子碘可以被 还原 成 碘化物，是一种 氧化剂，但强度弱于更轻的卤素。 (E° = 0.54 V)。 双原子碘可以氧化 硫化氢，形成硫单质： [8] 被 …

As an imaginary unit, use i or j (in electrical engineering), which satisfies the basic equation i2 = −1 or j2 = −1. The calculator also converts a complex number into angle notation (phasor notation), exponential, or polar coordinates (magnitude and angle). Enter expression with complex numbers like 5* (1+i) (-2-5i)^2.

2018年4月23日 · So, i^2= (sqrt (-1))^2=-1.

In a two-port network, i2 helps determine the output current based on input voltage and other parameters, allowing for effective circuit design and analysis. The relationship between i1 (input current) and i2 can be described using various parameters like Z …

2014年12月6日 · Preparation: A. Dissolve 10 g potassium iodide in 100 ml of distilled water. B. Slowly add 5 g iodine crystals, while shaking. C. Filter and store in a tightly stoppered brown bottle. This solution has the name of Lugol's iodine solution. As you can see, it has 0.0197 mol of iodine and 0.06 mol of potassium iodide. Highly active question.