How does the disturbance travel through the coil when you move your arm back and forth?

Uranium and radium are found in many rocky soils throughout the world. Both undergo radioactive decay, and one of the products i

Inessa05 [86]

(a) <u>0.15 Bq/L</u> is the safe level of radon in Bq/L of air/

<h3>Radionuclides: Uranium and Radium</h3>

So you've just had your water tested and the lab results are telling you that you've got radionuclides.

Radionuclides are radioactive isotopes or unstable forms of elements. Radioactivity is the release of energy, radiation, that occurs when these unstable elements decay or breakdown into more stable elements. This process is known as radioactive decay and is measured by the half-life of the element. The half-life is the time required for half of the original element to decay. The half-life for radionuclides can range from a few thousands of a second to a few billion years.

The two most common radionuclides found in groundwater supplies are Uranium and Radium. Uranium and Radium are naturally occurring elements that are found throughout the Mid-Atlantic and Northeastern United States in bedrock deposits like shale or granite deep below the surface. Rather than the glowing green rocks often portrayed in cinema or television, uranium and radium are found in ores mixed with other minerals and metals.

Uranium is the largest naturally occurring element on earth, nearly 70% denser than lead, and exists naturally as three different isotopes: U-234, U-235, and U-238, with U-238 and U-235 being the most common. U-235 is the preferred isotope for nuclear power generation. All three forms of uranium have the same chemical and physical properties, but have different radioactive properties.

In very low pH conditions, uranium exists in a cation oxidized form UO2, but it is most commonly present as anionic compounds UO2(CO3)2 and UO2(CO3)3. As uranium decays naturally over time, it releases radiation and forms new elements like radium, lead, and radon gas.

Learn more about radon

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5 0

1 year ago

Vitellium (Vi) has the following composition:Vi-188: 187.9122 amu; 10.861%Vi-191: 190.9047 amu; 12.428%Vi-193: 192.8938 amu; 76.

yKpoI14uk [10]

10.861% / 100 = 0.10861

12.428 % / 100 = 0.12428

(0.10861 * 187.9122) + (0.12428 * 190.9407) <span>+ (0.76711 x 192.8938)</span>

= 192.1100 amu .

hope this helps!

7 0

3 years ago

Approximately how many ice cubes must melt to cool 650 milliliters of water from 29°C to 0°C? Assume that each ice cube contains

qwelly [4]

Answer : The number of ice cubes melt must be, 13

Explanation :

First we have to calculate the mass of water.

$\text{Mass of water}=\text{Density of water}\times \text{Volume of water}$

Density of water = 1.00 g/mL

Volume of water = 650 mL

$\text{Mass of water}=1.00g/mL\times 650mL=650g$

Now we have to calculate the heat released on cooling.

Heat released on cooling = $m\times c\times (T_2-T_1)$

where,

m = mass of water = 650 g

c = specific heat capacity of water = $4.18J/g^oC$

$T_2$ = final temperature = $29^oC$

$T_2$ = initial temperature = $0^oC$

Now put all the given values in the above expression, we get:

Heat released on cooling = $650g\times 4.18J/g^oC\times (29-0)^oC$

Heat released on cooling = 78793 J = 78.793 kJ (1 J = 0.001 kJ)

As, 1 ice cube contains 1 mole of water.

The heat required for 1 ice cube to melt = 6.02 kJ

Now we have to calculate the number of ice cubes melted.

Number of ice cubes melted = $\frac{\text{Total heat}}{\text{Heat for 1 ice cube}}$

Number of ice cubes melted = $\frac{78.793kJ}{6.02kJ}$

Number of ice cubes melted = 13.1 ≈ 13

Therefore, the number of ice cubes melt must be, 13

3 0

4 years ago

How many inches are in 6.32 cm

rusak2 [61]

How many inches are in 6.32 cm=2.48818898

4 0

4 years ago

Kindly tell me all the important things to remember about periodic table. Like, how it was made, it's history and other stuff. T

Molodets [167]

Remember that the:
1. Vertical columns are groups and families
2. Horizontal columns are periods
3. Period 1 has 2 e-, 2 has 8 e-, 3 has 8 e-, and 4 has 18 e-
3.The number on top of the groups/families shows what group it is on (ex. 1A, 2A, 3B, 4B, etc) and the number on top of that indicates the number of the same thing (what group it is)
⇒ ex. 1A has 1 val e-. 2A has 2 val e-. 3A has 3 val e- ( and rest goes up until 8A). Note: I skipped the transitions metals since they don't have accurate amount of val e-.
4. Know which is the mass number, atomic number, symbol, or name.
5. Where the metals, non- metals, and metalloids are located.
6. Elements on the same groups have similar properties.
7. The first group is Akali Metals and are very unstable and very reactive
8. Second group is Akaline Earth Metals
9. The middle, groups 3-12 are Transition Metal
10. Group 13 is the Boron Family.
11. Group 14 is the Carbon Family
12. Group 15 is the Nitrogen Family
13. Group 16 is the Oxygen Family.
14. Group 17 is the Halogen, salt families
15. Group 18 is the Noble Gases, and are very stable and not reactive.
I hope this helps. :)

7 0

3 years ago