4 years ago

According to the Doppler Effect, which statement is true about a sound as it approaches you and then moves away.

1 answer:

3 0

I think the answer is A

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NNADVOKAT [17]

It’s A because energy passes freely through the atmosphere and is absorbed by earths surface.

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3 years ago

Igoryamba

It is the first choice

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4 years ago

IceJOKER [234]

Answer:200×10^5 meters

Explanation:

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3 years ago

vekshin1

A. Up and to the right
B. Put it in the opposite direction so it won’t go left

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3 years ago

MakcuM [25]

Answer: 86.47 g of carbon-14 must have been present in the sample 11,430 years ago.

Explanation:

Half-life of sample of carbon -14= 5,730 days

$\lambda=\frac{0.693}{t_{\frac{1}{2}}}=\frac{0.693}{5,730 days}=0.00012 day^{-1}$

Let the sample present 11,430 years(t) ago = $N_o$

Sample left till today ,N= 0.060 g

$N=N_o\times e^{-\lambda t}$

$ln[N]=ln[N]_o-\lambda t$

$\log[0.060 g]=\log[N_o]-2.303\times 0.00012 day^{-1}\times 11,430 days$

$\log[N_o]=1.9369$

$N_o=86.47 g$

86.47 g of carbon-14 must have been present in the sample 11,430 years ago.

5 0

3 years ago