# The work functions of Caesium $$(\mathrm{Cs})$$, Potassium $$(\mathrm{K})$$ and Sodium $$(\mathrm{Na})$$ are $$2.14~\text{eV}$$, $$2.30~\text{eV}$$ and $$2.75~\text{eV}$$ respectively. If incident electromagnetic radiation has an incident energy of $$2.20~\text{eV}$$. which of these photosensitive surfaces may emit photoelectrons? 1. $$\mathrm{Na}$$ only 2. $$\mathrm{Cs}$$ only 3. Both $$\mathrm{Na}$$ and $$\mathrm{K}$$ 4. $$\mathrm{K}$$ only

Subtopic: Â Photoelectric Effect: Experiment |
Â 65%
From NCERT
NEET - 2023
Please attempt this question first.
Hints
Please attempt this question first.

The de Broglie wavelength associated with an electron, accelerated by a potential difference of $$81$$ V is given by:
1. $$13.6$$ nm
2. $$136$$ nm
3. $$1.36$$ nm
4. $$0.136$$ nm
Subtopic: Â De-broglie Wavelength |
Â 54%
From NCERT
NEET - 2023
Please attempt this question first.
Hints
Please attempt this question first.

The maximum kinetic energy of the emitted photoelectrons in photoelectric effect is independent of:
 1 work function of material 2 intensity of incident radiation 3 frequency of incident radiation 4 wavelength of incident radiation
Subtopic: Â Photoelectric Effect: Experiment |
Â 76%
From NCERT
NEET - 2023
Please attempt this question first.
Hints
Please attempt this question first.

The threshold frequency of a photoelectric metal is $$\nu_0.$$ If the light of frequency $$4\nu_0$$ is incident on this metal, then the maximum kinetic energy of emitted electrons will be:
 1 $$h\nu_0$$ 2 $$2h\nu_0$$ 3 $$3h\nu_0$$ 4 $$4h\nu_0$$
Subtopic: Â Einstein's Photoelectric Equation |
Â 83%
From NCERT
NEET - 2022
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 light rays having photons of energy $$4.2~\text{eV}$$ are falling on a metal surface having a work function of $$2.2~\text{eV}.$$ The stopping potential of the surface is:
 1 $$2~\text{eV}$$ 2 $$2~\text{V}$$ 3 $$1.1~\text{V}$$ 4 $$6.4~\text{V}$$
Subtopic: Â Einstein's Photoelectric Equation |
Â 64%
From NCERT
NEET - 2022
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

In a photoelectric experiment, blue light is capable of ejecting a photoelectron from a specific metal while green light is not able to eject a photoelectron. Ejection of photoelectrons is also possible using light of the colour:
1. yellow
2. red
3. violet
4. orange

Subtopic: Â Photoelectric Effect: Experiment |
Â 83%
From NCERT
NEET - 2022
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 de-Broglie wavelength of the thermal electron at $$27^\circ \text{C}$$ is $$\lambda.$$ When the temperature is increased to $$927^\circ \text{C},$$ its de-Broglie wavelength will become:
1. $$2\lambda$$
2. $$4\lambda$$
3. $$\frac\lambda2$$
4. $$\frac\lambda4$$

Subtopic: Â De-broglie Wavelength |
Â 60%
From NCERT
NEET - 2022
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 graph which shows the variation of de-Broglie wavelength $$(\lambda)$$ of a particle and its associated momentum $$(p)$$ is:
 1 2 3 4
Subtopic: Â De-broglie Wavelength |
Â 83%
From NCERT
NEET - 2022
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

When two monochromatic lights of frequency, $$\nu$$ and $$\dfrac{\nu}{2}$$ are incident on a photoelectric metal, their stopping potential becomes $$\dfrac{V_{s}}{2}$$ and $$V_s$$, respectively. The threshold frequency for this metal is:
 1 $$\dfrac{3}{2} \nu$$ 2 $$2\nu$$ 3 $$3\nu$$ 4 $$\dfrac{2}{3} \nu$$
Subtopic: Â Einstein's Photoelectric Equation |
Â 69%
From NCERT
NEET - 2022
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 $$c$$ is the velocity of light in free space, the correct statements about photon among the following are:
 A. The energy of a photon is $$E=h\nu.$$ B. The velocity of a photon is $$c.$$ C. The momentum of a photon, $$p={\dfrac{h\nu}{c}}.$$ D. In a photon-electron collision, both total energy and total momentum are conserved. E. Photon possesses positive charge.
Choose the correct answer from the options given below:
1. $$\text {A, B, C}$$ and $$\text {D}$$ only
2. $$\text {A, C}$$ and $$\text {D}$$ only
3. $$\text {A, B, D}$$ and $$\text {E}$$ only
4. $$\text {A}$$ and $$\text {B}$$ only
Subtopic: Â Particle Nature of Light |
Â 56%
From NCERT
NEET - 2024
Please attempt this question first.
Hints
Please attempt this question first.