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Taya2010 [7]
3 years ago
10

For gamma radiation, what stops its penetrating abilities? aluminum lead fabric paper skin NextReset ©

Chemistry
2 answers:
Ivanshal [37]3 years ago
8 0

lead is mostly used in radio active suits to protect people from it

Lelechka [254]3 years ago
5 0
A thick piece of lead
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Use the Rydberg equation to calculate the wavelength (in nm) of the photon emitted when a hydrogen atom undergoes a transition f
natka813 [3]

Answer:

The answer is 434nm

Explanation:

The Rydberg equation is an empirical relationship expressed by Balmer and Rydberg which is stated as:

1/λ =      R_{H} (\frac{1}{n_{f} ^{2} }-\frac{1}{n_{i} ^{2} } ).............................. (1)

where λ is the wavelength, R_{H} is the Rydberg constant equal to 1.097 x 10^{7}m^{-1}, n is the transition level number, the subscript f and i are the final and initial levels respectively. Therefore for final transition n = 2 and for initial transition n = 5.

Making substitutions into equation (1), gives

1/λ =  1.097 x 10^{7} (\frac{1}{2^{2} }-\frac{1}{5^{2} })

   = 1.097 x 10^{7} (\frac{1}{4} - \frac{1}{25} )

     = 1.097 x 10^{7} (0.25 - 0.04)

   = 1.097 x 10^{7} x 0.21

   = 2303700

∴ λ = \frac{1}{2303700} = 4.34 x 10^{-7}m

Converting to nm, we have

  λ   = \frac{4.34 x 10^{-7} }{10^{-9} } = 434nm

Therefore, the wavelength of the emitted photon is 434nm

6 0
4 years ago
What are the atomic number and mass number of this atom
lina2011 [118]
No diagram is given therefore I cannot answer however, use this for reference.
The atomic mass of an atom would be the number of protons PLUS the number of neutrons. Because this atom shown has 6 protons and 6 neutrons, they add up to 12. In this case, the atomic mass of this atom is 12. Atomic number is the number of protons in an atom, in this case it is 6. The atomic number is 6.

5 0
3 years ago
How many neutrons make up one of these potassium atoms <br>​
julia-pushkina [17]

Answer:

4

Explanation:

I dont know that's all you need

5 0
3 years ago
Calculate the mass of 0.5dm3 of a 2g/dm3 solution of silver nitrate
cupoosta [38]

Answer:

5.6

Explanation:

Because of the gravity of the earth

6 0
3 years ago
Calculate the vapor pressure (in torr) at 298 K in a solution prepared by dissolving 42.4 g of the non-volatile non-electrolye u
timofeeve [1]

Answer:

The vapor pressure at 298 K for this solution is 50,49 Torr.

Explanation:

We have to apply Raoult's law to solve this which its formula is:

P pure sv° - P sl = P pure sv° . X (molar fraction)

ΔP = P pure sv° . X (molar fraction)

58,9 Torr - P sl = 58,9 Torr . X

Molar mass urea CO(NH2)2: 60,06 g/m

Molar mass ethanol: 46,07 g/m

Moles for urea: 42,4 g /  60,06 g/m = 0,705 moles

Moles for ethanol: 195 g / 46,06 g/m = 4,233 moles

X (molar fraction): moles from solute / moles from solute + moles from solvent

X (molar fraction): 0,705 / 0,705 + 4,233 = 0,142

58,9 Torr - P sl = 58.9 Torr . 0,142

58,9 Torr - 8,40 Torr = P sl

50,49 Torr = P sl

8 0
3 years ago
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