Answer:
= 1.47 eV
Explanation:
This is an exercise that we can solve using the photoelectric effect, which stable that photons can be treated as particles and collide with the material, the process is described by the expression
+ Φ = h f
Where Kmanx is the maximum energy of the torn electrons, Φ is the work function of the material and hf is the energy of the photons
With the initial data we calculate the job function
We use the relationship of wave velocity with wavelength and frequency
c = λ f
f = c / λ
f = 3 10⁸/400 10⁻⁹
f = 7.5 10¹⁴ Hz
Let's reduce the magnitude to the SI system
= 1.10 eV (1.6 10⁻¹⁹ J / 1 ev = 0.6875 10⁻¹⁹ J
Φ = h f -
Φ = 6.63 10⁻³⁴ 7.5 10¹⁴ - 0.6875 10⁻¹⁹
Φ = 4.9725 10⁻¹⁹ - 0.6875 10⁻¹⁹
Φ = 4.275 10⁻¹⁹ J
Now let's calculate the frequency of the other wavelength
f = c / λ₂
f = 3 10⁸/300 10⁻⁹
f = 1 10¹⁵ Hz
We calculate
= hf - Φ
= 6.63 10⁻³⁴ 1 10¹⁵ - 4.275 10⁻¹⁹
= 6.63 10⁻¹⁹ - 4,275 10⁻¹⁹
= 2,355 10⁻¹⁹ J
= 2,355 10⁻¹⁹ j (1 eV / 1.6 10⁻¹⁹ j)
= 1.47 eV
Answer:
Option B is correct.
Explanation:
Given data
Height of the hill = AB = 1 m
Distance traveled along the rough bottom surface = AC = 2 m
Now from the ΔABC
![\sin \theta = \frac{AB}{AC}](https://tex.z-dn.net/?f=%5Csin%20%5Ctheta%20%3D%20%5Cfrac%7BAB%7D%7BAC%7D)
![\sin \theta = \frac{1}{2}](https://tex.z-dn.net/?f=%5Csin%20%5Ctheta%20%3D%20%5Cfrac%7B1%7D%7B2%7D)
°
We know that the coefficient of kinetic friction is
![\mu = \tan \theta](https://tex.z-dn.net/?f=%5Cmu%20%3D%20%5Ctan%20%5Ctheta)
![\mu = \tan 30](https://tex.z-dn.net/?f=%5Cmu%20%3D%20%5Ctan%2030)
0.5
This is the value of the coefficient of kinetic friction
Thus option B is correct.
Answer:
dude just use the calculator fr
The units which would need to be converted before being used for a calculation are cm and 0 ks.
<h3>
What is Unit?</h3>
This is referred to a standard which is used to make comparisons in the aspect of measurement.
The units cm and 0 ks aren't in their standard form which is m and s respectively.
Read more about Unit here brainly.com/question/4895463
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An imbalance of electrons causes an object to be charged. A charged substance is one that has a net charge that is not zero. If the number of protons and that of electrons is equal in an object, the object is not neutral, but it has zero charge. Loss or gain of electrons determine the charge of an object, when an object loses electrons it becomes positively charged, but when it gains electrons it becomes negatively charged.