Tiwari Academy Discussion

Jugal Kishor

Asked: January 14, 2025In: Class 12 Physics

Define intensity of radiation in photon picture of light. Write its SI unit.

In photon picture of light, intensity of radiation is defined as the energy transferred to a surfac unit area per unit time by the photons striking on the surface. Its SI unit is watt/m² (W m²). Class 12 Physics Chapter ...

Jugal Kishor

Asked: January 14, 2025In: Class 12 Physics

For a given photosensitive material and with a source of constant frequency of incident radiation, how does the photocurrent vary with the intensity of incident light?

For a given photosensitive material and with a source of constant frequency v (v > vo) of incident radiation, the photocurrent increases with increase in intensity of incident light. Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter ...

Jugal Kishor

Asked: January 14, 2025In: Class 12 Physics

State one factor which determines the intensity of light in the photon nature of light.

Number of photons incident per unit area per unit time on a surface governs the intensity of light Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Session 2024-2025.

Jugal Kishor

Asked: January 14, 2025In: Class 12 Physics

Define the term threshold frequency, in the context of photoelectric emission.

Threshold frequency of a material is the minimum frequency of incident radiation needed to cause photoelectric emission from the surface of that material. Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Session 2024-2025.

Jugal Kishor

Asked: January 14, 2025In: Class 12 Physics

Define work function for a given metallic surface.

The minimum amount of energy required to just eject an electron from a given metal surface is called the work function for that metal surface. Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Session 2024-2025.

Jugal Kishor

Asked: January 14, 2025In: Class 12 Physics

Name the phenomenon which shows the quantum nature of electromagnetic radiation.

Phenomenon of photoelectric effect shows the quantum nature of electromagnetic radiation. Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Session 2024-2025.

Jugal Kishor

Asked: January 14, 2025In: Class 12 Physics

Define the term ‘stopping potential’ in relation to photoelectric effect.

In photoelectric effect, the stopping potential is the least value of negative potential to be applied in a photoelectric tube for which photoelectric current becomes zero. Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Session 2024-2025.

Jugal Kishor

Asked: January 14, 2025In: Class 12 Physics

Two metals A and B have work functions 2eV and 5eV, respectively. Which metal has a lower threshold wavelength?

Metal B having higher work function of 5 eV will have a lower threshold wavelength. Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Session 2024-2025.

Vidya01 Vats

Asked: January 11, 2025In: Class 12 Physics

Explain the following giving reasons When light travels from a rarer to a denser medium, the speed decreases. Does the reduction in speed imply a reduction in the energy carried by the light wave?:

No. Reduction in speed of light has no connection with energy carried by light wave. Energy carried by a wave depends only on its amplitude. Class 12 Physics Chapter 10 Wave Optics Session 2024-2025.

Vidya01 Vats

Asked: January 10, 2025In: Class 12 Physics

For a given single-slit, the diffraction pattern is obtained on a fixed screen first by using red light and then with blue light. In which case, will the central maxima, in the observed diffraction pattern, have a larger angular width?

For blue light the angular width of central diffraction maximum is more than that for red light. Class 12 Physics Chapter 10 Wave Optics Session 2024-2025.

Define intensity of radiation in photon picture of light. Write its SI unit.

For a given photosensitive material and with a source of constant frequency of incident radiation, how does the photocurrent vary with the intensity of incident light?

State one factor which determines the intensity of light in the photon nature of light.

Define the term threshold frequency, in the context of photoelectric emission.

Define work function for a given metallic surface.

Name the phenomenon which shows the quantum nature of electromagnetic radiation.

Define the term ‘stopping potential’ in relation to photoelectric effect.

Two metals A and B have work functions 2eV and 5eV, respectively. Which metal has a lower threshold wavelength?

Explain the following giving reasons When light travels from a rarer to a denser medium, the speed decreases. Does the reduction in speed imply a reduction in the energy carried by the light wave?:

For a given single-slit, the diffraction pattern is obtained on a fixed screen first by using red light and then with blue light. In which case, will the central maxima, in the observed diffraction pattern, have a larger angular width?

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