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Alexxx [7]
3 years ago
5

10

Physics
1 answer:
ANEK [815]3 years ago
8 0
The answer for this equation is A
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What happens when a sound wave passes from water to air?
s344n2d4d5 [400]
It slows down. The molecules/particles aren't as close together, resulting in slower movement.
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3 years ago
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I have an object that I want to know when it was made. I calculate that the object contains 0.12g of Iodine-131 but started with
Sav [38]

Answer: 71.72 days

Explanation:

This problem can be solved using the <u>Radioactive Half Life Formula: </u>

A=A_{o}.2^{\frac{-t}{h}} (1)  

Where:  

A=0.12 g is the final amount of Iodine-131

A_{o}=60 g is the initial amount of Iodine-131

t is the time elapsed  

h=8 days is the half life of Iodine-131

Knowing this, let's substitute the values and find t from (1):

0.12 g=(60 g)2^{\frac{-t}{8 days}} (2)  

\frac{0.12 g}{60g}=2^{\frac{-t}{8 days}} (3)  

Applying natural logarithm in both sides:

ln(\frac{0.12 g}{60g})=ln(2^{\frac{-t}{8 days}}) (4)  

-6.21=-\frac{t}{8 days}ln(2) (5)

Finding t:

t=71.72 days

7 0
4 years ago
Which unit would be most suitable for its scale?
Cloud [144]

Answer:

Mm, thats the answer trust me men

5 0
3 years ago
Electricity cost 10p how much will it cost to use a 85w laptop and a 60w lamp for an hour
Reil [10]

Answer:

Explanation:

usually electricity is sold in the units of kWh, which I will ASSUME is the case here.

85 W (1 kW/1000W)(1hr)(10 p) = 0.85p

60 W (1 kW/1000W)(1hr)(10 p) = <u>0.60p</u>

together they would cost           1.45 p

which would be rounded down to 1 p

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Can light be reflected and refracted at the same time?
Alik [6]
Yes. If you notice when you look at a window you can see through it but sometimes you can see yourself as well, due to refraction and reflection. 
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