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4 years ago

What is a major goal of the federal government when managing land resources?

Physics

2 answers:

oksian1 [2.3K]4 years ago

4 0

Answer:

I just took the quiz and got 100% when choosing A.Conservation. Hope this helps:)

Sergio [31]4 years ago

3 0

Answer:

Explanation:

Because its right

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This is the process of retaining radiation without reflecting it.

Bezzdna [24]

Absorption is the correct term.

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4 years ago

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Help me<br> please <br> lol<br> ?????

myrzilka [38]

Answer:

150 N= 15 or 150 N= 1.1

Explanation:

What I did was subtract 165kg and 150 N and I divided it too but I got 1.1 so yuhh

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3 years ago

Which body part would most likely be affected by the improper application of a compression wrap?

Alborosie

It could be your arms or legs

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3 years ago

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The wavelength you entered in the last problem is related to the energy required to eject an electron from sodium metal, the so-

I am Lyosha [343]

Answer:

2.30 eV

Explanation:

Some details of the problem are missing:

"Light of wavelength 540 nm is required to extract electrons from sodium. What is the work function of sodium?"

The equation that describes the photoelectric effect is

$\frac{hc}{\lambda}=\phi +K$

where:

$\frac{hc}{\lambda}$ is the energy of the incoming photon, with

$h=6.63\cdot 10^{-34} Js$ is Planck constant

$c=3.0\cdot 10^8 m/s$ is the speed of light

$\Phi$ is the work function of the material

K is the maximum kinetic energy of the emitted photoelectrons

The minimum energy needed by the photons to extract the photoelectrons is that for which the kinetic energy is zero, so

K = 0

Therefore we have

$\frac{hc}{\lambda}=\phi$

In this problem, we know that the wavelength of the incoming light is

$\lambda=540 nm = 540\cdot 10^{-9}m$

Therefore, we can find the work function of sodium:

$\phi=\frac{hc}{\lambda}=\frac{(6.63\cdot 10^{-34})(3\cdot 10^8)}{540\cdot 10^{-9}}=3.68\cdot 10^{-19}J$

And converting into electronvolts,

$\phi=\frac{3.68\cdot 10^{-19}J}{1.6\cdot 10^{-19}}=2.30 eV$

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3 years ago

HELP ME I WILL GIVE YOU 80 POINTS PLSSSSSS I NEED HELP ANSWER ALL THE QUESTION AND I WILL GIVE YOU EVERYTHING PLSS

marshall27 [118]

Answer:

1. 1675

2.1838

3.1855

Explanation: It proves that every living thing on Earth is made up of one or more cells. It impacted modern science because now scientists can find out more about organisms that they couldn't have if they didn't know about cells. Because of this, scientists don't have to worry about lack of understanding the organisms.

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3 years ago