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Mekhanik [1.2K]
3 years ago
11

The crew of a cargo plane wishes to drop a crate of supplies on a target below. To hit the target, where should the crew drop th

e crate? ignore air resistance.a. When the plane is directly over the targetb. Before the plane is directly over the targetc. After the plane has flown over the target
Physics
1 answer:
Nostrana [21]3 years ago
7 0
I don’t know geting points
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The work function of an element is the energy required to remove an electron from the surface of the solid. The work function fo
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Answer:

λ = 548.7 nm

Explanation:

Hi!

First we want to know how much energy we need to remove 1 electron from the surface of the solid:

218.1 kJ/mol => 218 100 J / (6.022 x 10^23) electrons

                             = 3.621 x 10^-19 J/electron  

That is we need 3.621 x 10^-19 J to remove one electron

Now we can calculate the wavelength that a photon must have in order to have this energy:

E = (hc) / λ

λ = (hc) / Ε

where

 h = 6,626070150(69) ×10 -34 Js (wikipedia)

 c = 3 x10^8 m/s

hc = 1.987 x 10^-25 Jm

Therefore:

λ = ( 1.987 x 10^-25 /3.621 x 10^-19 ) m = 5.487 x 10^-7 m

λ = 548.7 nm

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3 years ago
According to Newton's second law of motion, if we we have a rigid, unchanging mass and we observe it accelerating, what must be
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A. a force is being applied to the mass
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Brownian motion and diffusion

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