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yKpoI14uk [10]
2 years ago
13

4. Two scientists are experimenting with pure samples of isotope X, a highly radioactive substance. The first scientist has a sa

mple with a mass of 20 grams. He
measures a half-life of 232 seconds. The second scientist has a sample of the same substance with a mass of 80 grams. What is the half-life that she is most likely
to measure?
A. 58 seconds
B.232 seconds
C.464 seconds
D. 928 seconds
Physics
1 answer:
AlekseyPX2 years ago
4 0

Answer:

D

Explanation:

The substances are the exact same!

The half life should be the same too :)

A half life is how long it takes for a substance to break down and leave your system.

So for 20 grams, it goes away in 232 seconds, but for 80 grams, which is 4 times the amount, you would also multiply the half life by 4

I hope this is correct!

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1. An electric iron has a rating of 750W, 220V. Calculate:
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docker41 [41]

Answer:

Los objetos A y C tienen cargas del mismo signo (opcion a)

Explanation:

Hay dos tipos de cargas : cargas positivas y cargas negativas.

La Ley de Coulomb dice que la fuerza electrostática entre dos cargas puntuales es proporcional al producto de las cargas e inversamente proporcional al cuadrado de la distancia que las separa, y tiene la dirección de la línea que las une y se cumple que:

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Es decir que las cargas de igual signo se repelen, mientras que las de diferente signo se atraen.

Entonces, si se juntan los objetos A y B y se repelen significa que la carga es del mismo signo.

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Por lo que podes concluir que <u><em>los objetos A y C tienen cargas del mismo signo (opcion a)</em></u>

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