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lawyer [7]
4 years ago
15

A radioactive isotope has a half-life of ten days.how much of a 100 gram sample will be left after 20 days

Physics
1 answer:
kolbaska11 [484]4 years ago
3 0

Answer:

25

Explanation:

after10 days it would be 50 then it would be 25 after another 10

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A jewellery shop owner has two identical clear gemstones but cannot remember which one is diamond and which one is rutile. Rutil
pantera1 [17]

We know

\boxed{\sf n_{21}=\dfrac{C}{V}}

How he find:-

The owner will measure speed of light through the index(Diamond or rutile).Then using calculations he fill find which is the velocity of diamond or rutile

<h3> For diamond</h3>

\\ \sf\longmapsto n_D=\dfrac{C}{V_D}

\\ \sf\longmapsto 2.4=\dfrac{3\times 10^8ms^{-1}}{V_D}

\\ \sf\longmapsto V_D=\dfrac{3\times 10^8ms^{-1}}{2.4}

\\ \sf\longmapsto V_D=1.25\times 10^8ms^{-1}

\\ \sf\longmapsto V_D=125\times 10^6ms^{-1}

<h3>For rutile</h3>

\\ \sf\longmapsto n_R=\dfrac{C}{V_R}

\\ \sf\longmapsto V_R=\dfrac{C}{n_R}

\\ \sf\longmapsto V_R=\dfrac{3\times 10^8ms^{-1}}{2.9}

\\ \sf\longmapsto V_R=1.03\times 10^8

\\ \sf\longmapsto V_R=103\times 10^6ms^{-1}

5 0
3 years ago
According to Bernoulli's Principle what statement below is How does a wing achieve
Blababa [14]

<em>your answer would be <u>C</u></em>

<em>by forcing air to move faster over the top of the wing thus creating higher pressure below the wing and lower pressure above the wing</em>

hope this helped you- have a good day bro cya)

3 0
3 years ago
Consider the direction field of the differential equation dy/dx = x(y − 6)2 − 4, but do not use technology to obtain it. Describ
Alona [7]

Answer:

The slopes shows that the direction of the field is from -2 to +2, with three point charges, q₁, q₂ and q₃ at -2, 0 and +2 respectively.

Explanation:

Given;

The slope, dy/dx = 2x(y-6) - 4

2x(y-6) - 4 = 2xy - 12x - 4, divide through by 'x'

dy/dx = 2y -12 - 4/x

The slopes of the linear elements on the lines, x =0, y = 5, y = 6, y = 7.

At x = 0, and y = 5

dy/dx = 2y -12 - 4/x

dy/dx = 2(5) - 12 = -2

At x = 0, and y = 6

dy/dx = 2y -12 - 4/x

dy/dx = 2(6) - 12 = 0

At x = 0, and y = 7

= 2y -12 - 4/x

dy/dx = 2(7) - 12 = 2

Therefore, the slopes shows that the direction of the field is from -2 to +2, with three point charges, q₁, q₂ and q₃ at -2, 0 and +2 respectively.

5 0
3 years ago
Which type of graph uses wedges to show the amount of data points in a category?
Umnica [9.8K]
A pie chart uses wedges to show the amount of data points in a category.
8 0
4 years ago
Read 2 more answers
An object moves 20 m east in 30 s and then returns to its starting point taking an additional 50 s. If west is chosen as the pos
disa [49]

The sign associated with the average velocity of the object is negative.

<h3>Average velocity of the object</h3>

The average velocity of the object is calculated as follows;

Average velocity = (v1 + v2)/2

v1 = -20/30 = -0.667 m/s

v2 = 20/50 = 0.4 m/s

Average velocity = (-0.667 + 0.4)/2

Average velocity  = -0.134 m/s

Thus, the sign associated with the average velocity of the object is negative.

Learn more about average velocity here: brainly.com/question/6504879

#SPJ1

7 0
2 years ago
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