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3 years ago

Which nucleus completes the following equation?

Physics

2 answers:

natali 33 [55]3 years ago

8 0

Answer:

$_{84}^{208}Po$

B is correct.

Explanation:

Given the equation

$_{86}^{212}Rn\rightarrow_{2}^{4}He$

According to alpha emission

Alpha emission is a radioactive decay in which the atomic nucleus emit the alpha particle and formed a new nucleus whose mass number reduced by four and atomic number reduced by two.

Therefore,

Po is the new nucleus.

$_{86}^{212}Rn\rightarrow_{2}^{4}He+_{84}^{208}Po$

Where, Rn = Radon

Po= polonium

siniylev [52]3 years ago

7 0

A is the answer I really don’t know the answer to that but if u can u can help me on my work

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3 years ago

Read 2 more answers

Electrons are accelerated in the picture tube of a television through potential difference of 8.00 * 10 ^ 3 V. (Use the values q

maria [59]

Answer:

$\lambda=1.37\times 10^{-11}\ m$

Explanation:

Give that,

The potential difference of the electrons, $V=8\times 10^{3}\ V$

We need to find the wavelength of the electrons.

Using the conservation of energy,

$2meV=\dfrac{h^2}{\lambda^2}\\\\\lambda=\sqrt{\dfrac{h^2}{2meV}}$

Put all the values,

$\lambda=\sqrt{\dfrac{(6.63\times 10^{-34})^2}{2\times 9.1\times 10^{-31}\times 1.6\times 10^{-19}\times 8\times 10^3}}\\\\\lambda=1.37\times 10^{-11}\ m$

So, the wavelength of the electrons is $1.37\times 10^{-11}\ m$ .

7 0

3 years ago

Which compound has ionic bonding? A. Cl2 B. HF C. CaO D. NO2

GrogVix [38]

the answer is CaO because that's what my homework says is correct

7 0

3 years ago

A crate is pushed horizontally by a horizontal force 527.018 N . Sliding friction resists the motion, and the kinetic coefficien

gulaghasi [49]

Answer:

m= 10 kg a = 52 m / s²

Explanation:

For this problem we must use Newton's second law, let's apply it to each axis

X axis

F - fr = ma

The equation for the force of friction is

-fr = miu N

Axis y

N- W = 0

N = mg

Let's replace and calculate laceration

F - miu (mg) = ma

a = F / m - mi g

a = 527.018 / m - 0.17 9.8

We must know the mass of the body suppose m = 10 kg

a = 527.018 / 10 - 1,666

a = 52 m / s²

5 0

3 years ago

2. Jenny picks up a guitar and strums. If the sound from the string emanates out at 440 Hz,

erik [133]

Answer:

6.8×10^6 m

Explanation:

f = velocity of light/ wavelength

440= 3×10^8 / wavelength

wavelength = 3×10^7/ 44

= 6.8×10^6 m

7 0

3 years ago