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dexar [7]
3 years ago
9

If an unshielded sample of radioactive material emits alpha particles, what effect will it have on a person sitting in the next

room? (Assume the wall between rooms is composed of concrete.)
Chemistry
2 answers:
Flauer [41]3 years ago
7 0
Alpha radiation can only travel a few centi-metres in air and can be stopped (or absorbed) by a sheet of paper. Alpha particles can only penetrate a very thin sheet of paper and is totally blocked by the concrete. As these particles move through the air, it loses energy from the collisions with air molecules making it less penetrating.<span>
 
On the other hand:
Beta radiation can travel a bit further, around tens of centi-metres in air so a thicker substance is required to absorb the radiation. It can be stopped by a thin sheet of aluminium.

Gamma radiation however can travel for many meters so it requires a material much thicker to absorb it.</span>
o-na [289]3 years ago
5 0

Answer:

None, because the wall will block the radiation.

Explanation:

on edge

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The characteristic bright-line spectrum of an atom is produced when
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Bright Line Emission Spectrum: As the excited electron returns to ground state (it's lower energy level) the energy it originally absorbed is released as discrete lines of light.

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3 years ago
What layers are composed of metals? Choose all that apply.<br> Inner core<br> Outer core<br> Mantle
svlad2 [7]

Answer:

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3 0
2 years ago
How many CaF are in a 1.7x10^25 please I need help fast!!
Gemiola [76]
<h3>Answer:</h3>

28 mol CaF

<h3>General Formulas and Concepts:</h3>

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right<u> </u>

<u>Chemistry</u>

<u>Atomic Structure</u>

  • Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

<u>Stoichiometry</u>

  • Using Dimensional Analysis
<h3>Explanation:</h3>

<u>Step 1: Define</u>

[Given] 1.7 × 10²⁵ molecules CaF

[Solve] moles CaF

<u>Step 2: Identify Conversions</u>

Avogadro's Number

<u>Step 3: Convert</u>

  1. [DA] Set up:                                                                                                          \displaystyle 1.7 \cdot 10^{25} \ molecules \ CaF(\frac{1 \ mol \ CaF}{6.022 \cdot 10^{23} \ molecules \ CaF})
  2. [DA] Multiply/Divide [Cancel out units]:                                                         \displaystyle 28.2298 \ moles \ CaF

<u>Step 4: Check</u>

<em>Follow sig fig rules and round. We are given 2 sig figs.</em>

28.2298 mol CaF ≈ 28 mol CaF

7 0
3 years ago
A student creates a model that displays a cross-section of a metal wire wrapped in plastic insulation. Which statement best desc
artcher [175]

Cross-section of a metal wire wrapped in plastic insulation the metal wire is an element.

<h3>What is an element?</h3>

An element is a substance or material that cannot be affected by an external substance or cannot be broken down by any reaction.

Metal wire is serving as an element, it should not be easily broken or penetrated as an insulator.

Therefore, Cross-section of a metal wire wrapped in plastic insulation the metal wire is an element.

Learn more on element here,

brainly.com/question/18096867

7 0
2 years ago
I’ll give 5 stars and Brainliest plus this is 20 points lol
Daniel [21]

Answer:

I think is b

Explanation:

4 0
3 years ago
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