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Flura [38]
4 years ago
9

Alexandra knows that the atomic number of the element potassium, K, is 19. She also knows that one particular isotope of potassi

um has a mass number of 39. How many neutrons can be found in the nucleus of this isotope of potassium?
A) 19

B) 20

C) 39

D) 58
Physics
1 answer:
fiasKO [112]4 years ago
8 0
I believe the answer is 58 but I’m not sure
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3 years ago
A diverging lens (f1 = -12.0cm) is located 50.0 cm to the left of a converging lens (f2 = 34.0 cm). A 2.0 cm-tall object stands
pishuonlain [190]

Answer:

The final image relative to the converging lens is 34 cm.

Explanation:

Given that,

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Height of object = 2.0 cm

Distance of object = 12 cm

Because object at focal point

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Using formula of lens

\dfrac{1}{v}=\dfrac{1}{f}-\dfrac{1}{u}

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v=\infty

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We need to calculate the image distance of converging lens

Now, object distance is ∞

Using formula of lens

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v=34

The image distance is 34 cm right to the converging lens.

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5 0
4 years ago
Simple level physics equation
goblinko [34]

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7 0
3 years ago
Hot water is poured into a mug and the mug gets hot. This is an example of which type of energy transfer?
Korolek [52]

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Two capacitors are connected in series and the combination is charged to 120V. There's 90.0V across one capacitor, whose capacit
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Answer:

0.84μF

Explanation:

Charge is same through both the capacitors since they are in series. Total voltage is the sum of the voltages of the individual capacitors.. So voltage across the 2nd capacitor is 120- 90 =30 V.

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4 0
3 years ago
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