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Step2247 [10]
3 years ago
8

A long stairway with a metal handrail runs between the houses of Amelia and her friend Michelle. After getting their parents' pe

rmission, the two girls often play near the stairs. One day, Michelle stands at the top of the steps and taps the railing with a stone. Amelia stands at the bottom of the steps with her right ear pressed against the railing.
Amelia sees Michelle tap the railing, then she hears the sound with the ear that is pressed against the railing. Last, Amelia hears the sound with her other ear. Why did Amelia hear the sound with her right ear before her left ear?
A.
because light travels more quickly through air than sound does
B.
because the particles that carry sound energy travel more quickly through solids than through gases
C.
because the waves that carry sound energy travel more quickly through solids than through gases
D.
because her right ear was closer to Michelle, who was the source of the sound

PLEASSSSSE HEEELLPPP MMMMEEEE
Chemistry
2 answers:
Ahat [919]3 years ago
5 0

Answer:

D.

because her right ear was closer to Michelle, who was the source of the sound

jasenka [17]3 years ago
5 0

Answer:

because the waves that carry sound energy travel more quickly through solids than through gases

Explanation:

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L and D forms of a molecule are what kind of isomers?
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Answer:

enantiomers

Explanation:

L and D stand for levorotatory and dextrorotatory respectively. A levorotatory molecule will rotate the plane of plane polarised light left and a dextrorotatory molecule will rotate the plane of plane polarised light right.  L and D molecules are non superimposable mirror image of each other. Therefore they are also known as enantiomers.

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Goshia [24]

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lighter atoms especially hydrogen

Explanation:

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3 years ago
For the following reaction, the equilibrium constant Kc is 0.80 at a certain temperature. If the concentration of NO(g) and NOBr
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Eq    0.80M            ?                0.80M

That's the situation told, in the statement.

Let's make the expression for Kc

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