The minimum energy required to remove an electron is called 
(1) Stopping potential               

(2) Kinetic energy

(3) Work function                     

(4) None of these

Subtopic:  Electron Emission |
 83%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Assuming photoemission to take place, the factor by which the maximum velocity of the emitted photoelectrons changes when the wavelength of the incident radiation is increased four times, is 
(1) 4                       

(2) 14

(3) 2                       

(4) 12

Subtopic:  Electron Emission |
 52%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

If the work function of a metal is 'ϕ' and the frequency of the incident light is 'ν', there is no emission of photoelectron if
(1) v<ϕh                   

(2) v=ϕh   

(3) v>ϕh                   

(4) v>=ϕh   

Subtopic:  Electron Emission |
 75%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

Light of wavelength λ strikes a photo-sensitive surface and electrons are ejected with kinetic energy E. If the kinetic energy is to be increased to 2E, the wavelength must be changed to λ' where 
(1) λ'=λ2           

(2) λ'=2λ

(3) λ2<λ'<λ      

(4) λ'>λ

Subtopic:  Einstein's Photoelectric Equation |
 54%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

If in a photoelectric experiment, the wavelength of incident radiation is reduced from \(6000~\mathring{A}\) to \(4000~\mathring{A}\), then:
1. The stopping potential will decrease.
2. The stopping potential will increase.
3. The kinetic energy of emitted electrons will decrease.
4. The value of the work function will decrease.
Subtopic:  Photoelectric Effect: Experiment |
 75%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The photoelectric work function for a metal surface is 4.125 eV. The cut-off wavelength for this surface is

(1) 4125 Å                 

(2) 2062.5 Å

(3) 3000 Å                 

(4) 6000 Å

Subtopic:  De-broglie Wavelength |
 77%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

As the intensity of incident light increases,

1. photoelectric current increases.
2. photoelectric current decreases.
3. kinetic energy of emitted photoelectrons increases.
4. kinetic energy of emitted photoelectrons decreases.

Subtopic:  Photoelectric Effect: Experiment |
 85%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Which of the following is dependent on the intensity of incident radiation in a photoelectric experiment

(1) Work function of the surface

(2) Amount of photoelectric current

(3) Stopping potential

(4) Maximum kinetic energy of photoelectrons

Subtopic:  Photoelectric Effect: Experiment |
 84%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately

(1) 540 nm                 

(2) 400 nm

(3) 310 nm                 

(4) 220 nm

Subtopic:  Electron Emission |
 82%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy 6 eV fall on it is 4 eV. The stopping potential in volts is

(1) 2                     

(2) 4

(3) 6                     

(4) 10

Subtopic:  Electron Emission |
 56%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch