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PolarNik
1 month ago
14

The reaction energy of a reaction is the amount of energy released by the reaction. It is found by determining the difference in

mass between the reactants and products and then using E=mc2 to convert the lost mass into the released energy. Look again at the equation for the decay of radium (Ra), given in the introduction. Use the following table of masses to determine the reaction energy of this reaction.Nucleus or particle Mass in atomic mass unitsradium-226 226.025402radon-222 222.017571alpha particle 4.002602Express your answer in joules to three significant figures.
Physics
1 answer:
Yuliya22 [3.3K]1 month ago
5 0
The appropriate answer is 7.8026035971 x 10^(-13) joule. Using the principle of energy conservation, the term “alpha decay” signifies the transformation of the parent particle into an alpha particle alongside daughter particles. The total mass of the alpha and daughter radon combines to 226.02017 u. Therefore, considering that the parent had a mass of 226.02540 u, a portion of mass is evidently lost, calculated as Delta m = 226.02540 u - 226.02017 u = 0.00523 u. This resulted in an energy equivalent of Delta E = (0.00523 u)(931.5 MeV/1u), which translates to 4.87 MeV. For the conversion to Joules, where 1 joule [J] equals 6241506363094 MeV, the energy can be expressed as 4.87 MeV = 7.8026035971 x 10^(-13) joule.
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A 6V radio with a current of 2A is turned on for 5 minutes. Calculate the energy transferred in joules
ValentinkaMS [3465]

Answer:

R=V/I=6/2=3 ohm

time = 5 minutes = 5*60=300 seconds

I=2 A

Energy = I²Rt=(2)²*3*300=4*900=3600 J

7 0
3 months ago
Two of the types of ultraviolet light, uva and uvb, are both components of sunlight. their wavelengths range from 320 to 400 nm
Sav [3153]

In terms of light energy, a higher frequency corresponds to increased energy within the light.

We establish that frequency is essentially the inverse of wavelength:

frequency = 1 / wavelength

Calculating frequencies:

f UVA = 1/320 to 1/400

f UVA = 0.0031 to 0.0025

 

f UVB = 1/290 to 1/320

f UVB = 0.0034 to 0.0031

Since UVB occupies a higher frequency range, it consequently possesses greater energy than UVA.

7 0
2 months ago
Read 2 more answers
A particle moves according to a law of motion s = f(t), t ≥ 0, where t is measured in seconds and s in feet. f(t) = 0.01t4 − 0.0
serg [3582]
Since you've completed parts a and b, I will tackle part c.
For part C
To respond to this question, we must identify the zeros of the velocity function:
v(t)=0.04t^3-0.06t^2
This polynomial can be factored:
v(t)=0.04t^3-0.06t^2=t^2(0.04t-0.06)
Finding the zeros now becomes straightforward since the function equals zero when any factor is zero.
t^2=0;\\ 0.04t-0.06=0
By solving these equations, we identify our zeros:
t_1=0; t_2=\frac{3}{2}
The particle remains stationary at t=0 and t=3/2.
For part D
We must discover when the velocity function exceeds zero. We will utilize its factored form.
We will assess when each factor is greater than zero and compile the findings in the following table:
\centering \label{my-label} \begin{tabular}{lllll} Range & -\infty & 0 & 3/2 & +\infty \\ t^2 & - & + & + & + \\ 0.04t-0.06 & - & - & + & + \\ t^2 (0.04t-0.06) & + & - & + & + \end{tabular}
From the table, it's evident that our function is positive when - \infty < t and t>3/2.
This indicates the interval during which the particle moves forward.
For part E
The distance traveled can be represented as:
s(t)=0.01t^4 - 0.02t^3
We simply substitute t=12 to calculate the total distance traveled:
s(12)=0.01(12)^4 - 0.02(12)^3=172.80 ft
For part F
Acceleration is defined as the rate at which velocity changes.
We determine acceleration by deriving the velocity function concerning time.
a(t)=\frac{dv}{dt}=(0.04t^3-0.06t^2)'=0.12t^2-0.12t
To find the acceleration at 1 second, we substitute t=1s into the previous equation:
a(1)=0.12-0.12=0


7 0
2 months ago
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