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Planck's Quantum theory ..



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Q1. What is the effect of intensity on the stopping potential?

(a) As intensity increases, stopping potential increases linearly
(b) As intensity increases, stopping potential decreases linearly
(c) As intensity decreases, stopping potential increases exponentially
(d) No effect

Q2. The Kinetic energy of a photoelectron emitted on shining a light of wavelength 6.2 X 10-6 m on a metal surface of work function 0.1 eV is _________________

(a) 0.01 eV
(b) 0.02 eV
(c) 0.1 eV
(d) 1 eV

Q3. Light of wavelength 3500 ? is incident on two metals A and B. Which metal will yield more photoelectrons if their work functions are 5 eV and 2 eV respectively?

(a) A
(b) B
(c) A & B
(d) C

Q4. The work function of lithium is 2.5 eV. The maximum wavelength of light that can cause the photoelectric effect in lithium is ______________

(a) 3980 ?
(b) 4980 ?
(c) 5980 ?
(d) 6980 ?

Q5. Identify the correct order of frequencies.

(a) v1 > v2 > v3
(b) v2 > v3 > v1
(c) v3 > v2 > v1
(d) v1 > v3 > v2

Q6. The photoelectric emission could be explained by the ____________

(a) Wave nature of light
(b) Particle nature of light
(c) Dual nature of light
(d) Quantum nature

Q7. How does the intensity affect the photoelectric current?

(a) As intensity increases, the photoelectric effect increases
(b) As the intensity increases, the photoelectric effect decreases
(c) As the intensity decreases, the photoelectric effect becomes twice
(d) No effect

Q8. What is the time lag between the incidence of photons and the ejection of photoelectrons?

(a) Greater than 10-5 s
(b) Between 10-5 s and 10-9 s
(c) Less than 10-9 s
(d) 1 second

Q9. What is the relation between the interaction parameter, ?b?, and atomic radius, R, for the Photoelectric effect?

(a) b > R
(b) b ? R
(c) b < R
(d) no relation between b and R

Q10. During Einstein?s Photoelectric Experiment, what changes are observed when the frequency of the incident radiation is increased?

(a) The value of saturation current increases
(b) No effect
(c) The value of stopping potential increases
(d) The value of stopping potential decreases


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Assertion : Cathode Rays Do Not Travel In Straight Lines. Reason : Cathode Rays Penetrate Through Thick Sheets.

Modified 249 Year Ago

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249 Year Ago

Assertion : Cathode Rays Do Not Travel In Straight Lines. Reason : Cathode Rays Penetrate Through Thick Sheets.

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0 Answer
418 views

E/m Ratio Was Determined By

Modified 249 Year Ago

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249 Year Ago

E/m Ratio Was Determined By

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403 views

Magnitude Of K.E. In An Orbit Is Caused By

Modified 249 Year Ago

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249 Year Ago

Magnitude Of K.E. In An Orbit Is Caused By

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0 Answer
344 views

The Minimum Real Charge On Any Particle Which Can Exist Is

Modified 249 Year Ago

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249 Year Ago

The Minimum Real Charge On Any Particle Which Can Exist Is

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0 Answer
343 views

Assertion : Cathode Rays Are A Stream Of α -particles. Reason : They Are Generated Under High Pressure And High Voltage.

Modified 249 Year Ago

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249 Year Ago

Assertion : Cathode Rays Are A Stream Of α -particles. Reason : They Are Generated Under High Pressure And High Voltage.

0 votes
0 Answer
325 views

The Average Distance Of An Electron In An Atom From Its Nucleus Is Of The Order Of

Modified 249 Year Ago

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249 Year Ago

The Average Distance Of An Electron In An Atom From Its Nucleus Is Of The Order Of

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