The Zirconium Nucleus Contains 40 Protons, and an Electron Is $1.0 \mathrm {~nm}$

question 91

Multiple Choice

The zirconium nucleus contains 40 protons, and an electron is $1.0 \mathrm {~nm}$ from the nucleus. What is the electric force on the electron due to the nucleus? $\left( e = 1.60 \times 10 ^ { - 19 } \mathrm { C } , k = 1 / 4 \pi \varepsilon _ { 0 } = 9.0 \times 10 ^ { 9 } \mathrm {~N} \right.$ . $\mathrm { m } ^ { 2 } / \mathrm { C } ^ { 2 }$ )

• A) \(1000 \mathrm { C }\)
• B) \(3.7 \mathrm { nN }\)
• C) \(9.2 \mathrm { nN }\)
• D) \(6.8 \mathrm { nN }\)
• E) \(2.9 \mathrm { nN }\)

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Definitions:

Companion Cells

Plant cells that are intimately associated with sieve tube elements in the phloem and help in the transport of substances essential for the plant's metabolism.

Phloem

The vascular tissue in plants responsible for transporting sugars, proteins, and other solutes throughout the plant.

Collenchyma

A type of plant tissue composed of elongated cells with thickened cell walls that provide structure and support, especially in areas of new growth.

Sclerenchyma

A type of plant tissue known for its thick, lignified cell walls, which provide structural support.