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Katen [24]
3 years ago
7

20 POINTS WILL GIVE BRAINLY IF ANSWERED CORRECTLY

Chemistry
1 answer:
kolbaska11 [484]3 years ago
6 0

Answer:

D

Explanation:

The answer is D- There are more collisions of air molecules against the wall of the balloon.

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Laney left a nail in water for two weeks, and the nail became rusted from sitting in the water.
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B) A chemical change because the nail reacts with water/oxygen to create rust (a type of oxide)
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3 years ago
What is the frequency of a wave with a wavelength of 6.40x10^4 meters?
yKpoI14uk [10]

Answer:

frequency = 0.47×10⁴ Hz

Explanation:

Given data:

Wavelength of wave = 6.4× 10⁴ m

Frequency of wave = ?

Solution:

Formula:

Speed of wave = wavelength × frequency

Speed of wave = 3 × 10⁸ m/s

Now we will put the values in formula.

3 × 10⁸ m/s = 6.4× 10⁴ m × frequency

frequency = 3 × 10⁸ m/s / 6.4× 10⁴ m

frequency = 0.47×10⁴ /s

s⁻¹ = Hz

frequency = 0.47×10⁴ Hz

Thus the wave with wavelength of 6.4× 10⁴ m have 0.47×10⁴ Hz frequency.

4 0
3 years ago
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Problem:
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Answer:

it is Calcium (Ca)

4th period, 2nd group, 2 valence electrons

7 0
3 years ago
Dolphins communicate using compression waves (longitudinal waves).  Some of the sounds dolphins make are outside the range of hu
Gre4nikov [31]
I believe the answer is A. <span>make a softer sound because the shark will not hear the softer signal.
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I say this becasue "</span><span>Some of the sounds dolphins make are outside the range of human hearing." So that means the the dolphins speak at a higher wavelength then us humans and we can't hear it so they could use that to their advantage and speak at a height wavelength to each other when sharks are near. 

I could be wrong, but I think the answer is A. </span>
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3 years ago
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Need help don’t understand this??!
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Answer:

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2 years ago
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