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JEE Physics > Dual Nature Of Matter & Radiation > Flashcards

Dual Nature Of Matter & Radiation Flashcards

1
Q

What did JJ thompson discover

A

E/M=1.76×10¹¹
E-charge of e
M-mass of e

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2
Q

What did oil drop experiment discover

A

E=1.6×10-¹⁹
Therfore
M=9.1×10-³¹

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3
Q

Diffrent type of electronic emissions

A

1)Thermionic
2)Secondary
3)Field
4)PhotoElectric

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4
Q

What is work function

A

Min energy required to eject an e from a metal surface

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5
Q

Work function equation

A

Φ0=hν0

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6
Q

Equation of energy using ν

A

E=hν

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7
Q

ν

A

Provided Frequency

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8
Q

ν0

A

Minimum frequency required for ejection
•Threshold frequency

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9
Q

Relation btw ν and λ

A

λ = 1/ν

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10
Q

Relation btw ν & ν0

A

ν>ν0

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11
Q

Relation btw λ & λ0

A

λ<λ0

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12
Q

Energy using λ

A

E=hc/λ

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13
Q

λ0

A

Maximum wavelength up to which emission of e takes place

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14
Q

Lowest work function

A

Cs — 2.14 eV

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15
Q

Highest work function

A

Pt — 5.65 eV

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16
Q

Relatio of ν & λ wiht diffrent Wavelength

A

G X U V I M R
——————>
ν↓ λ↑

17
Q

E eqn using λ

A

E=1240/λnm

18
Q

Wavelength of red light

A

200nm

19
Q

Wavelength of Violet

A

400nm

20
Q

Relation btw work function and temperature

A

Φ0 = 1/T

21
Q

e ejected during photoelectric effect is called

A

Photo electron

22
Q

Relation btw intesity of light and current generated

A

I = Ip

23
Q

Maximum value of current

A

Saturated current

24
Q

–ve potential to make ip 0 is called

A

Stopping Potential V0

25
Q

ν Constant
In increased↑

A

Same ν0
I3>I2>I1

26
Q

ν Increase
I constant

A

V03>V02>V01

27
Q

Laws of Photoelectric effect 1

A

1) There must be ν0 before which no photo electric effect takes place

28
Q

Law of Photoelectric 2

A

I of incident light ↑ & no of e ejected ↑&
ip↑

29
Q

Law of photo electric effect 3

A

Collision & Ejejction are spontaneous & instantaneous

30
Q

Relation btw KE & ν

A

1/2mvmax2 = eV0

31
Q

Classical wave theory & its failures 1

A

📈 I↑= A2↑Therfore KE of ejected e ↑
📉ν↑ KE ↑

32
Q

Classical wave theory & its failures 2

A

📈ν ↑ then ip↑
📉I↑ip↑

33
Q

Classical wave theory 3

A

📈ν of a light is said it is distributed thrughout the different es therfore it takes long time
📉ejection of e takes place instantly

34
Q

Einstein’s explanation of photoelectric effect

A

According to quantum theory , light cosist of small packets called photon
having energy (hν)

35
Q

Photon

A

Light consist of small packets of energy (hν)

36
Q

Who found photons

A

Max Plank

37
Q

Characteristics of photon 1

A

Chargeless

38
Q

Characteristics of photon

A

Rest mass = 0

39
Q

Momentum of light

A

P=h/λ

JEE Physics (2 decks)

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