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Svetllana [295]
4 years ago
7

A monochromatic light beam with a quantum energy value of 4.3 ev is incident upon a photocell. the work function of the photocel

l is 2.2 ev. what is the maximum kinetic energy of the ejected electrons?
Physics
2 answers:
Black_prince [1.1K]4 years ago
7 0
Give me some answer choices and i will be happy to help
olganol [36]4 years ago
7 0

As per Einstein's Photo electric effect theory

E = \phi + KE

the energy which incident in form of photon will be absorbed by the metal surface and some of the energy is released in form of KE of ejected electrons

E = 4.3 eV

\phi = 2.2 eV

now from the above equation

E = \phi + KE

4.3 = 2.2 + KE

KE = 2.1 eV

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Answer:

absorbed/taken in

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An apple has 6 J of energy. The apple sits on a counter 3 m high. What is the mass of the apple?
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3 years ago
styrofoam has a density of 150 kg/m3 . what is the maximum mass that can hang without sinking from a 50-cm-diameter styrofoam sp
Bad White [126]

The correct answer is 9.45 kg.

The formula for calculating the density of an object is expressed as:

Density = mass / volume

Given :

Density = 150kg/m³

Volume of the sphere = negligible

r is the radius = 50/2 = 25cm = 0.25m

We can find the volume of the Styrofoam sphere by

=(4/3)πr³

Volume (V) = (4/3)*π*(0.25)³

Volume = 0.063 cm³

Now let us find the required mass:

Mass = density * volume                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            

Mass = 150 * 0.063

Mass = 9.45 kg

Therefore, the maximum mass that can hang without sinking from a 50.0 cm -diameter Styrofoam sphere in water is 9.45 kg.

To learn more about mass, refer: brainly.com/question/18386490

#SPJ4

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1 year ago
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I think its B. Sorry if Im wrong.
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