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Sonbull [250]
4 years ago
13

Hello jigxjufogonskdcxx ggnkctbntjc​

Physics
2 answers:
igor_vitrenko [27]4 years ago
7 0

Answer:

svbsshsjjsjs Hello :)

Ede4ka [16]4 years ago
3 0

Answer:

Hiiiiiiiiiiiii!!!!!!!!!!!!!!............ gshsujfhiwopqeyegsbdk

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The count rate of a radioactive source decreases from 1600 counts per minute to 400 counts per minute in 12 hours. What is the h
kirill115 [55]

Answer:

t_{1/2}=6 h

Explanation:

Let's use the decay equation.

A=A_{0}e^{-\lambda t}

Where:

  • A is the activity at t time
  • A₀ is the initial activity
  • λ is the decay constant

We know that \lambda=\frac{ln(2)}{t_{1/2}}

So we have:

\lambda=\frac{ln(A/A_{0})}{t}

\frac{ln(2)}{t_{1/2}}=\frac{ln(A/A_{0})}{t}

t_{1/2}=\frac{t*ln(2)}{ln(A/A_{0})}

t_{1/2}=6 h

Therefore, the half-life of the source is 6 hours.

I hope it helps you!

4 0
3 years ago
If the mass of a material is 48 grams and the volume of the material is 8 cm^3, what would the density of the material be?
iris [78.8K]
Density’s is mass by volume
So mass is 48 grams
Volume is 8cm^3
There is no need to convert units as they are same
So 48/8 gives you 6
So your answe should be 6g/cm^3 or 6gcm^-3
4 0
3 years ago
Substances A and B, initially at different temperatures, come in contact with each other and reach thermal equilibrium. The mass
Gnesinka [82]

Answer: .2) The final temperature will be exactly midway between the initial temperatures of substances A and B.

Explanation:

heat_{absorbed}=heat_{released}

As we know that,  

Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})

m_A\times c_A\times (T_{final}-T_A)=-[m_B\times c_B\times (T_{final}-T_2)]         .................(1)

where,  

q = heat absorbed or released

m_A = mass of A = 2x

m_B = mass of B = x

T_{final} = final temperature = z

T_A = temperature of A

T_2 = temperature of B

c_A = specific heat capacity of A = y

c_B = specific heat capacity of B = 2y

Now put all the given values in equation (1), we get

2x\times y\times (z-T_A)=-[x\times 2y\times (z-T_B)]

2z=T_B+T_A

z=\frac{T_B+T_A}{2}

Therefore, the final temperature of the mixture will be exactly midway between the initial temperatures of substances A and B.

3 0
3 years ago
Air pressure decreases as
bearhunter [10]
The answer is going to be B: elevation.
8 0
4 years ago
An electric motor converts electrical energy into______<br>energy​
faltersainse [42]
Mechanical energy is the answer
7 0
3 years ago
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