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Norma-Jean [14]
3 years ago
7

7. The grid in a triode is kept negatively charged to prevent A. electrons from escaping from the tube containing the triode. B.

electrons being repelled back to the cathode. C. the electrons from being attracted to the grid instead of the anode. D. the variations in voltage from getting too large.
Chemistry
1 answer:
romanna [79]3 years ago
5 0

Answer:

A. Electrons from escaping from the tube containing the triode.

:)

Explanation:

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4. ¿Cuál es la resistencia de un alambre de
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Answer:

R=0.0438 Ω

Explicación:

1) Hallar el área o sección del conductor de cobre, usando esta fórmula:

                                      A=π.r² (Pi x radio al cuadrado)

Debido a que conocemos el diámetro (1.5mm) su radio es la mitad de esto es decir 0.75mm, y lo sustituimos en la fórmula:

                                      A=π.(0.75mm)²

                                      A=π(0.5625mm²)

                                      A=1.7671mm²

2) La resistividad del cobre es: rho = 0,0172 y la incluimos en la fórmula siguiente:

                                      R=p  

                                      R=0,0172Ω  x  

Simplificamos:

R=

El resultado es:

R=0.0438 Ω

Explanation:

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HCl\rightarrow H^++Cl^-

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H_3PO_4\rightarrow H^++PO_4^{3-}


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