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garik1379 [7]
3 years ago
10

Which best describes the modern periodic table?

Chemistry
1 answer:
kaheart [24]3 years ago
5 0

answer:

D.

explanation:

as days years months go by more and more new elements that are chemically made or are natural are added even though the ones at school have been updated for such a long period of time

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Night visin cameras are sensitive to energies around 2.21 x 10-19 J. What wavelength of electromagnetic radiation do they use?
defon

Answer:

8.99×10^-7m

Explanation:

The wavelength can be calculated using the expression below

E=hcλ

Where E= energy= 2.21 x 10^-19 J.

C= speed of light= 3x10^8 m/s

h= planks constant= 6.626 × 10^-34 m2 kg / s

E=hcλ

λ= E/(hc)

Substitute for the values

λ=( 2.21 x 10^-19 )/(6.626 × 10^-34 × 3x10^8 )

= 8.99×10^-7m

6 0
3 years ago
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RoseWind [281]

Answer:

i wold think it is C

Explanation:

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What is 5.0553 x 10^-4 in standard notation?
Talja [164]

Answer:

0.00050553

Explanation:

when the power of ten is negative, move the decimal to the left

hope this helped!

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3 years ago
Come up with 2 examples of each law motion below: <br><br> 1st law:<br> 2nd law:<br> 3rd law:
Sloan [31]
1st law: Inertia, If you roll a ball it will not stop unless something blocks it by force.

2nd law: Force and Acceleration, when you’re riding a bike you are pushing the pedal with ur muscle which means you’re using force. Everytime you push the pedal the bike goes faster and faster which explains acceleration.

3rd law: Action and Reaction, If you run you’re feet pushes the ground (action) when your feet touches the ground it pushes you forward (reaction)
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What is the fundamental unit of surface water hydrology?
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The answer to this great question is C.Watershed
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3 years ago
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