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aleksley [76]
3 years ago
10

half life worksheet answer key 3. What percent of a sample As-81 remains un-decayed after 43.2 seconds

Physics
1 answer:
Ivahew [28]3 years ago
3 0

The final mass after decay can be obtained by using under given relation:

half life period of As-81 = 33 seconds

mf = mi x (1/2^n)

= 100 x ( 1/2^(43.2/33))

= 40.4 %


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Optical astronomers need a clear, dark sky to collect good data. Explain why radio astronomers have no problem observing in the
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Answer:

In the clarification portion elsewhere here, the definition of the concern is mentioned.

Explanation:

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Although radio telescopes monitor space-coming radio waves. Those other telescopes, when they are already typically very massive as well as costly, have such an improvement surrounded by optical telescopes. They should be included in poor weather and, when they travel through the surrounding air, the radio waves aren't obscured by clouds. Throughout the afternoon and also some at night, radio telescopes are sometimes used.

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2 years ago
Key difference of the celsius scale and kevin scale
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6 0
3 years ago
Wind tends to move from<br> pressure areas.<br> low, high<br> high, high<br> low, low<br> high, low
andrew-mc [135]

Answer:

high, low

Explanation:

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  • When there are fewer molecules in the given volume. The gas is said to be at lower pressure.
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So, the wind tends to move from high-pressure areas to low pressure.

3 0
2 years ago
The angular velocity (in rpm) of the blade of a blender is given in. If θ=0rad at t=0s, what is the blade's angular position at
Liula [17]

Answer:

θ = 20.9 rad

Explanation:

In a blender after a short period of acceleration the blade is kept at a constant angular velocity, for which we can use the relationship

           w = θ / t

           θ = w t

if we know the value of the angular velocity we can find the angular position, we must remember that all the angles must be in radians

suppose that the angular velocity is w = 10 rpm, let us reduce to the SI system

          w = 10 rpm (\frac{2\pi  rad}{1 rev}) ( \frac{1 min}{60 s} )

= 1,047 rads

let's calculate

          θ = 1,047 20

          θ = 20.9 rad

7 0
3 years ago
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Zepler [3.9K]

Answer:

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Explanation:

hope it helps u

5 0
3 years ago
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