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4 years ago

Hello jigxjufogonskdcxx ggnkctbntjc

Physics

2 answers:

igor_vitrenko [27]4 years ago

7 0

Answer:

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Ede4ka [16]4 years ago

3 0

Answer:

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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

Hello jigxjufogonskdcxx ggnkctbntjc​

Hello jigxjufogonskdcxx ggnkctbntjc