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Svetllana [295]
3 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]3 years ago
7 0
Give me some answer choices and i will be happy to help
olganol [36]3 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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Establishing a potential difference The deflection plates in an oscilloscope are 10 cm by 2 cm with a gap distance of 1 mm. A 10
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Answer:

t = 23.9nS

Explanation:

given :

Area A= 10 cm by 2 cm => 2 x 10^-2m x 10 x 10^-2m

distance d= 1mm=> 0.001

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Capacitance can be calculated through the following formula,

C = (ε0  x A )/d

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C = 17.7 x 10^-12    (pico 'p' = 10^-12)

C = 17.7pF

the voltage between two plates is related to time, There we use the following formula of the final voltage

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75 = 100 x (1-e^-(t/CR))

75/100 = (1-e^-(t/CR))

.75 = (1-e^-(t/CR))

.75 -1 = -e^-(t/CR)

-0.25 = -e^-(t/CR)  --->(cancelling out the negative sign)

e^-(t/CR) = 0.25

in order to remove the exponent, take logs on both sides  

-t/CR = ln (0.25)

t/CR = -ln(0.25)

t = -CR x ln (0.25)

t = -(17.7 x 10^-12 x 975) x (-1.38629)

t = 23.9 x 10^{-9  

t = 23.9ns

Thus, it took 23.9ns  for the potential difference between the deflection plates to reach 75 volts

6 0
3 years ago
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object of mass m is suspended from spring and set in oscillation with time Period T

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When mass m is replaced by a mass of 2 m time period is given by

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Leni [432]

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This can be explained by the fact that the earth has a stronger gravitational pull than the moon, producing more force per kilogram of mass. As a result, the moon's mass must be bigger to produce the same amount of force at a lower acceleration from gravity (1.6 m/s² vs. 9.8 m/s²).

To know more about Mass, refer to this link :

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