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OverLord2011 [107]
3 years ago
10

what do sound waves and infrared waves have in common, and what makes them different? both carry energy through space, but sound

waves are mechanical and infrared waves are electromagnetic. both can transfer energy through matter, but sound waves travel through air and infrared waves travel through space. both can transfer energy through matter, but sound waves can be heard and infrared waves can be seen. both carry energy through space, but sound waves require matter to pass through and infrared waves do not.
Physics
2 answers:
Tju [1.3M]3 years ago
5 0
Both can transfer energy through matter, but sound waves travel through air and infrared waves travel through space.

The second option.
balu736 [363]3 years ago
3 0

The correct answer to the question is : Both can transfer energy through matter, but sound waves can travel through air and infrared waves can travel through space.

EXPLANATION:

Before going to answer this question, first we have to understand the nature of sound and infrared waves.

Sound wave is a longitudinal wave which needs a medium for its propagation. The medium may be solid, liquid or gas. When we produce sound, the vibration of sound is received by our ear, and is heard due to brain.

Unlike sound wave, infrared wave does not require any medium for its propagation. It can travel in space with the speed of light. That's why it is a part of electromagnetic spectrum. But, this wave is neither heard nor seen. Only visible light is seen.  Infrared wave can also move in other medium also. It can be transmitted, reflected or absorbed by any medium.

From above, we see that both the waves can transfer energy through matter.

Hence, the second statement perfectly signifies the similarity and difference between them.

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A sample contains radioactive atoms of two types, A and B. Initially there are five times as many A atoms as there are B atoms.
victus00 [196]

Answer:

Explanation:

Initially no of atoms of A = N₀(A)

Initially no of atoms of B = N₀(B)

5 X N₀(A)  = N₀(B)

N = N₀ e^{-\lambda t}

N is no of atoms after time t , λ is decay constant and t is time .

For A

N(A) = N(A)₀ e^{-\lambda_1 t}

For B

N(B) = N(B)₀ e^{-\lambda_2 t}

N(A) = N(B) , for t = 2 h

N(A)₀ e^{-\lambda_1 t} = N(B)₀ e^{-\lambda_2 t}

N(A)₀ e^{-\lambda_1 t} = 5 x N₀(A)  e^{-\lambda_2 t}

e^{-\lambda_1 t} = 5  e^{-\lambda_2 t}

e^{\lambda_2 t} = 5  e^{\lambda_1 t}

half life = .693 / λ

For A

.77 =  .693 / λ₁

λ₁ = .9 h⁻¹

e^{\lambda_2 t} = 5  e^{\lambda_1 t}

Putting t = 2 h , λ₁ = .9 h⁻¹

e^{\lambda_2\times  2} = 5  e^{.9\times  2}

e^{\lambda_2\times  2} = 30.25

2 x λ₂ = 3.41

λ₂ = 1.7047

Half life of B = .693 / 1.7047

= .4065 hours .

= .41 hours .

6 0
3 years ago
A kid runs and slides down a slip-n-slide. Once the kid hits the slide they have 200N of friction force acting on them, and they
lutik1710 [3]
Mass (kg) = force (N) / acceleration (m/s).

200/2.5 = 80



7 0
3 years ago
According to the nebular theory, what early event eventually led to the formation of our solar system?​
qaws [65]

Answer:Solar system formed about 4.6 billion year ago, when gravity pulled together low-density cloud of interstellar gas and dust (called a nebula)(movie). The Orion Nebula, an interstellar cloud in which star systems and possibly planets are forming. Initially the cloud was about several light years across.

Explanation:

4 0
3 years ago
what is the total distance traveled by a bike rider who rides for three hours at 40 km/hr and then two more hours at 50 km/hr?
marta [7]

Answer:

220 km

Explanation:

3 hours at 40 km/hr

40 km = 1 hour

40 km times 3 = 120 km

2 hours at 50 km/hr

50 km = 1 hour

50 times 2 = 100 km

Total distance

120 km + 100 km = 220 km

4 0
3 years ago
PLEASE HELP ASAP...TIMED TEST. PLEASE ANSWER WITH AT LEAST A PARAGRAPH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
charle [14.2K]

Answer: I am pretty sure that you should pick radio waves.

Explanation: The scientist should use radio waves. I think this because you can use the radio waves to analyze the signals from outer space. This will work much better than anything there, to analyze it the best possible.

The best I could do.

8 0
3 years ago
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