Answer:
Explanation:
Based on the wave model of light, physicists predicted that increasing light amplitude would increase the kinetic energy of emitted photoelectrons, while increasing the frequency would increase measured current.
Contrary to the predictions, experiments showed that increasing the light frequency increased the kinetic energy of the photoelectrons, and increasing the light amplitude increased the current.
Based on these findings, Einstein proposed that light behaved like a stream of particles called photons with an energy of \text{E}=h\nuE=hνstart text, E, end text, equals, h, \nu.
The work function, \PhiΦ\Phi, is the minimum amount of energy required to induce photoemission of electrons from a metal surface, and the value of \PhiΦ\Phi depends on the metal.
The energy of the incident photon must be equal to the sum of the metal's work function and the photoelectron kinetic energy:
The emf induced in the coil is given by Faraday-Neumann-Lenz law:
![\epsilon = - \frac{\Delta \Phi}{\Delta t}](https://tex.z-dn.net/?f=%5Cepsilon%20%3D%20-%20%5Cfrac%7B%5CDelta%20%5CPhi%7D%7B%5CDelta%20t%7D%20)
where
![\Delta \Phi](https://tex.z-dn.net/?f=%5CDelta%20%5CPhi)
is the variation of magnetic flux through the coil
![\Delta t](https://tex.z-dn.net/?f=%5CDelta%20t)
is the time interval
The magnetic field intensity is
![B=0.55 G \cdot (1 \cdot 10^{-4} T/G) = 0.55 \cdot 10^{-4} T](https://tex.z-dn.net/?f=B%3D0.55%20G%20%5Ccdot%20%281%20%5Ccdot%2010%5E%7B-4%7D%20T%2FG%29%20%3D%200.55%20%5Ccdot%2010%5E%7B-4%7D%20T)
Since the magnetic field strength is constant, the variation of flux through the coil is given by
![\Delta \Phi = N B \Delta A](https://tex.z-dn.net/?f=%5CDelta%20%5CPhi%20%3D%20N%20B%20%5CDelta%20A)
(1)
where N=550 is the number of turns, while
![\Delta A](https://tex.z-dn.net/?f=%5CDelta%20A)
is the variation of area of the coil. We can re-write (1) as
![\Delta \Phi = NB (\pi r_1^2 - \pi r_2^2)=(550)(0.55 \cdot 10^{-4} T)(\pi (0.20m)^2-\pi (0.50m)^2) =](https://tex.z-dn.net/?f=%5CDelta%20%5CPhi%20%3D%20NB%20%28%5Cpi%20r_1%5E2%20-%20%5Cpi%20r_2%5E2%29%3D%28550%29%280.55%20%5Ccdot%2010%5E%7B-4%7D%20T%29%28%5Cpi%20%280.20m%29%5E2-%5Cpi%20%280.50m%29%5E2%29%20%3D)
![=-0.020 Wb](https://tex.z-dn.net/?f=%3D-0.020%20Wb)
The time interval is
![\Delta t=35 ms=0.035 s](https://tex.z-dn.net/?f=%5CDelta%20t%3D35%20ms%3D0.035%20s)
, therefore the induced emf is
Answer:
OA is the answer
Newton's third law of force states that: for every action (force) in nature there is an equal and opposite reaction. what this means is that if I push on you, you're also pushing me because I have slowed down but now you are falling to the mud.
if you have ever seen newtons balls then you will know what I am talking about, one is moving then it hits the other and it stops moving because now the other one is moving,
I hope this makes sense, if it doesent then go to the net and watch some videos on Newtons third law
hope it helped
<h3>
Answer:</h3>
24860 N
<h3>
Explanation:</h3>
From the question;
- Mechanical advantage is 0.0893
- Output force is 2220 Newtons
We are required to determine the input force;
- We know that mechanical advantage is the ratio of output force to input force.
- That is; M.A. = Output force ÷ Input force
- Rearranging the formula;
Input force = Output force ÷ M.A.
Therefore;
Input force = 2220 N ÷ 0.0893
= 24860 N
Hence, the input force is 24860 N
brainliest plz
The Ring of Fire, also referred to as the Circum-Pacific Belt, is a path along the Pacific Ocean characterized by active volcanoes and frequent earthquakes. Its length is approximately 40,000 kilometers (24,900 miles). It traces boundaries between several tectonic plates—including the Pacific, Juan de Fuca, Cocos, Indian-Australian, Nazca, North American, and Philippine Plates.
Seventy-five percent of Earth’s volcanoes—more than 450 volcanoes—are located along the Ring of Fire. Ninety percent of Earth’s earthquakes occur along its path, including the planet’s most violent and dramatic seismic events.
The abundance of volcanoes and earthquakes along the Ring of Fire is caused by the amount of movement of tectonic plates in the area. Along much of the Ring of Fire, plates overlap at convergent boundaries called subduction zones. That is, the plate that is underneath is pushed down, or subducted, by the plate above. As rock is subducted, it melts and becomes magma. The abundance of magma so near to Earth’s surface gives rise to conditions ripe for volcanic activity. A significant exception is the border between the Pacific and North American Plates. This stretch of the Ring of Fire is a transform boundary, where plates move sideways past one another. This type of boundary generates a large number of earthquakes as tension in Earth’s crust builds up and is released.