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3 years ago

14

If you had a string tied firmly to a post, and you created a wave that went down the string, why do you think would happen as th

e wave reached the post?
A.
B.
C.
D.

1 answer:

tresset_1 [31]3 years ago

7 0

I think it D because I watched a video where the man did this exact same thing and the wave came back

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11) Shifting with ease from one type of problem-solving strategy to another is called

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Answer:

B

Explanation:

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What is the wavelength of an X-ray photon with energy 8.0 keV (8000 eV)? (1 eV = 1.60 × 10−19 joule.)

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Answer:

Wavelength = 0.15 nm

Frequency = $1939.3939\times 10^{15}Hz$

Explanation:

We have given photon energy E = 8 KeV = 8000 eV

In question it is given that $1eV=1.6\times 10^{-19}J$

So $8000eV=1.6\times 8000\times 10^{-19}=12800\times 10^{-19}j$

Plank's constant $h=6.6\times 10^{-34}js$

We know that photon energy is given by $E=h\nu$

So $12800\times 10^{-19}=6.6\times 10^{-34}\nu$

$\nu =1939.3939\times 10^{15}Hz$

Now wavelength $\lambda =\frac{c}{f}=\frac{3\times 10^8}{1939.3939\times 10^{15}}=0.0015\times 10^{-7}m=0.15nm$

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4 years ago

The slight negative charge at one end of one water molecule is attracted to the slight positive charge of another water molecule

aleksley [76]

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Hopes this helped

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3 years ago

A marching band is practicing. The band director sees the drum major hit a drum. How far away is the director if he hears the dr

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Answer:

825 m

Explanation:

330 m/s

1 / 0.40 = 2.5

330 x 2.5 = 825

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