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mariarad [96]
3 years ago
6

During the day, the sun appears yellow in the sky. But as sunset approaches, the sun appears to change color. This can be explai

ned by the A) absorption of yellow wavelengths on Earth and the reflection of red into the atmosphere. B) change in water color on Earth that is then reflected into the sky as red and orange hues. C) scattering of light due to particulates in the atmosphere sending mostly red and orange wavelengths back to our eyes. D) refraction of white light into only two color bands, red and orange and the reflection of those colors into the atmosphere. Submit
Physics
1 answer:
alexdok [17]3 years ago
7 0

I believe the answer is C, scattering of light due to particulates in the atmosphere sending mostly red and orange wavelengths back to our eyes.

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Answer:

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Explanation:

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The outside diameter of the playing area of an optical Blu-ray disc is 11.75 cm, and the inside diameter is 4.50 cm. When viewin
erica [24]

Answer:

The minimum angular speed 57.0 rad/s

Explanation:

In this exercise we must use the relationships between the angular and linear magnitudes, for the speeds we have

      v = w r

 

As they give us that linear velocity is constant, we will calculate the angular velocity for the two radii, external and internal

     r1 = 11.75 cm (1 m / 100cm) = 0.1175 m

    w1 = v / r1

    w1 = 6.70 / 0.1175

    w1 = 57.0 rd / s

    R2 = 4.50 cm = 0.0450 m

    w2 = 6.70 / 0.0450

   w2 = 148 rad / s

The minimum angular speed 57.0 rad / s

4 0
3 years ago
Consider the following thermochemical equation:
Arisa [49]

Answer:

m_w=5.3248\times 10^{23}\ kg

Explanation:

According to the given reaction,

heat released by thecombustion of 2 molecules of Methanol, \Delta H=1277000\ J

we know that molecular mass of Methanol, m=32\ g.mol^{-1}

∴12 gram of methanol = \frac{3}{8}\ moles

we know 1 mole = 6.023\times 10^{23}\ molecules

so,

\rm \frac{3}{8} \ moles=2.258\times 10^{23}\ molecules

Heat from the combustion of 2.258\times 10^{23}\ molecules:

Q=1277000\times \frac{2.258\times 10^{23}}{2}

Q=1442132.0625\times 10^{23}\ J

<u>Now the  mass of water that can be heated from 23.5°C to 88.2°C :</u>

Q=m_w.c_w.\Delta T

1442132.0625\times 10^{23}=m_w.4186\times (88.2-23.5)

m_w=5.3248\times 10^{23}\ kg

8 0
3 years ago
If the frequency of this beam is increased while the intensity is held constant, does the number of electrons ejected per second
Ivan

Answer:

if the intensity of photons is constant then number of ejected electrons will remain same

Explanation:

As per photoelectric effect we know that when light of sufficient frequency fall on the surface of metal then electrons get ejected out of the surface with certain kinetic energy

Here the energy of photons is used to eject out the electrons from metal surface and to give the kinetic energy to the ejected electrons

so we have

h\nu = W + KE

here W = work function of metal which shows the energy required to eject out electrons from metal surface

KE = kinetic energy of ejected electrons

now if we increase the frequency of the photons that incident on the metal surface then in that case the incident energy will increase

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8 0
3 years ago
What is the speed of a ball that is attached to a string and swings in a horizontal circle of radius 2.0 m with the central acce
Ira Lisetskai [31]

Answer:

5.48 m/s.

Explanation:

Use the formula a=v^2/r.

7 0
3 years ago
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