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diamong [38]
2 years ago
10

In the alpha decay of Francium-221, what daughter element is produced? (You may need to refer to the periodic table in the lesso

n.)
Physics
2 answers:
d1i1m1o1n [39]2 years ago
6 0
In an alpha decay, the original nucleus decays into a daughter nucleus + an alpha particle, which consists of 2 protons and 2 neutrons.
The atomic number (number of protons) of the Francium is 87, and since in the decay it loses 2 protons, the atomic number of the daughter nucleus should be 85. Looking at the periodic table ,this corresponds to Astatine, and therefore this is the element produced in the alpha decay of Francium-221.
Moreover, the mass number (number of protons+neutrons) decreases by 4 (because an alpha particle carries 2 protons+2 neutrons), therefore in the reaction the mass number will decrease from 221 to 217. 
So, the daughter element is astatine-217.
Scilla [17]2 years ago
4 0

217   AT

 85      (i don't have enough characters so ignore this part)

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marin [14]

The acceleration of the particle at 3s is [tex]a = 6 \beta [/tex]

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<h3>How to calculate acceleration </h3>

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Acceleration is

a = 6 \beta

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2 years ago
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Explanation:

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1. A small package is dropped from the Golden Gate Bridge. What is the velocity of the package
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The velocity of the package  after it has fallen for 3.0 s is 29.4 m/s

From the question,

A small package is dropped from the Golden Gate Bridge.

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We are to calculate the velocity of the package  after it has fallen for 3.0 s.

From one of the equations of kinematics for objects falling freely,

We have that,

v = u + gt

Where

v is the final velocity

u is the initial velocity

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and t is time

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That means, we will determine the value of v, at time t = 3.0 s

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Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.


The red and blue dots represent is 

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<h3>How to calculate work done?</h3>

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