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swat32
3 years ago
15

When a physical change of a substance, like water occurs which of the following does not change?

Physics
2 answers:
FrozenT [24]3 years ago
6 0

Doesn’t change the composition

BabaBlast [244]3 years ago
3 0

During the change from ice to water, or from water to steam, or from steam to water, or from water to ice, the TEMPERATURE doesn't change.

If you have a gram of water at  32°F  (0°C)  and you freeze it, you get a gram of ice at the same temp ...  32°F  (0°C) .  The difference is that you had to take 337 joules of heat out of that water in order to freeze it.

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A beam of monochromatic light (f =5.09 ×1014 Hz) has a wavelength of 589 nanometers in air. What is the wavelength of this light
frosja888 [35]
Lucite has a refractive index of n=1.50. This means that the speed of the light in lucite is decreased according to:
v=\frac{c}{n}
where c=3 \cdot 10^8 m/s is the speed of light in air. Putting the number in the formula, we find that the speed of light in lucite is
v=\frac{3 \cdot 10^8 m/s}{1.50}=2\cdot 10^8 m/s
The frequency of the light is f=5.09 \cdot 10^{14}Hz, so now we can calculate the wavelength in lucite by using the formula:
\lambda=\frac{v}{f}=\frac{2\cdot 10^8 m/s}{5.09 \cdot 10^{14} Hz}=3.93 \cdot 10^{-7} m=393 nm
<span>Therefore, the correct answer is (2) 393 nm.</span>
7 0
3 years ago
A brick is dropped from 100m up. Find it's impact velocity and air time.
ivann1987 [24]
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otez555 [7]
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You perform a double‑slit experiment in order to measure the wavelength of the new laser that you received for your birthday. Yo
Vitek1552 [10]

Answer:

λ = 5.734 x 10⁻⁷ m = 573.4 nm

Explanation:

The formula of the Young's Double Slit experiment is given as follows:

\Delta x = \frac{\lambda L}{d}\\\\\lambda = \frac{\Delta x d}{L}

where,

λ = wavelength = ?

L = distance between screen and slits = 8.61 m

d = slit spacing = 1.09 mm = 0.00109 m

Δx = distance between consecutive bright fringes = \frac{4.53\ cm}{10} = 0.00453 m

Therefore,

\lambda = \frac{(0.00453\ m)(0.00109\ m)}{8.61\ m}

<u>λ = 5.734 x 10⁻⁷ m = 573.4 nm</u>

6 0
3 years ago
Which of the following directly contributed to soil erosion on the Great Plains in the 1930s?
NISA [10]

Answer:

Farming  

Explanation:

There were three droughts in the 1930s.

Farmers had deep plowed the land and killed the native grasses that trapped soil and moisture.

During the droughts, the moisture evaporated, and the loose soil turned to dust.

4 0
4 years ago
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