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3 years ago

What are electromagnetic waves? I need answer pls

1 answer:

3 0

In physics, electromagnetic radiation refers to the waves of the electromagnetic field, propagating through space, carrying electromagnetic radiant energy. It includes radio waves, microwaves, infrared, light, ultraviolet, X-rays, and gamma rays

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Radon (Rn) is the heaviest, and only radioactive, member of Group 8A(18) (noble gases). It is a product of the disintegration of

Serggg [28]

Given data Atomic mass of Ra= 226g/mol

no. of moles =1.0/226g/mol =0.04424moles

no. of atoms in 0.044moles

no. of atoms =no. of moles x avogadro's number

= 0.044x 6.022 x10^23 = 0.264968 x 10^22

If 10^15 atoms of Ra produce 1,373*10^4 atoms of Rn per second then 2,66 *10^21 forms 3,658*10^10 atoms of Rn per second.

Day has 246060=86400 s

That means that 2,66x10^21 atoms of Ra produces 3,16 x10^15 atoms of Rn in a day.

N(Rn)=3.16* 10 ^15 n(Rn)=N/NA

n(Rn)=5,25*10−9 pV=nR*T

T=273.15K R=8,314

p=101325Pa V=n∗R∗T/p

V=5.25∗10^−9 ∗ 8.314 ∗ 273.15 / 101325

V=1.1810^−10 m^3 = 118 x10^-7 liters of Rn, measured at STP, are produced per day by 1.0 g of Ra

To know more about Ra here

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6 0

2 years ago

I need help!!!!!!! please

lions [1.4K]

Answer:

A. bacteria

Explanation:

can i have brainlest?

8 0

3 years ago

Calculate the energy of an electron in the n = 2 level of a hydrogen atom.

ANEK [815]

Answer: The energy of an electron in the n = 2 level of a hydrogen atom is 3.40 eV.

Explanation:

Given: n = 2

The relation between energy and $n^{th}$ orbit of an atom is as follows.

$E = - \frac{13.6}{n^{2}} eV$

Substitute the values into above formula as follows.

$E = - \frac{13.6}{n^{2}} eV\\= - \frac{13.6}{(2)^{2}}\\= - 3.40 eV$

The negative sign indicates that energy is being released.

Thus, we can conclude that the energy of an electron in the n = 2 level of a hydrogen atom is 3.40 eV.

5 0

3 years ago

Convert 5.8 km to the unit mm. 0.0000058 mm 0.0058 mm 5,800 mm 5,800,000 mm

spin [16.1K]

Its going to b 5,800,000 due to each Km being 1,000,000 Mm
Hope this helps :D

5 0

3 years ago

At the end of 2019, Blossom Company has accounts receivable of $756,900 and an allowance for doubtful accounts of $59,600. On Ja

KATRIN_1 [288]

Answer:

Explanation:

Adjusting entries:

S.no. Accounts title and explanation Debit $ Credit $

a. Accounts receivable 5800

Allowance for doubtful accounts 5800

(for reversing the write off)

b. Cash account 5800

Accounts receivable 5800

(for cash collection from write off account)

5 0

3 years ago