(A) The frequency of the incident light is given by $\nu = \frac{c}{\lambda}$.Given $\lambda = 4000 \ \mathring{A} = 4000 \times 10^{-10} \ m$ and $c

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No photoelectric emission takes place

(A) The frequency of the incident light is given by $\nu = \frac{c}{\lambda}$.Given $\lambda = 4000 \ \mathring{A} = 4000 \times 10^{-10} \ m$ and $c = 3 \times 10^8 \ m/s$.$\nu = \frac{3 \times 10^8}{4000 \times 10^{-10}} = \frac{3 \times 10^8}{4 \times 10^{-7}} = 0.75 \times 10^{15} \ Hz$.The threshold frequency is $\nu_0 = 10^{15} \ Hz$.Since the frequency of incident light $\nu Therefore,no photoelectric emission takes place.

Class 12 Physics Dual Nature of Radiation and Matter Photoelectric Effect by Lenard and it's Observations

Medium

Threshold frequency for a metal is $10^{15} \ Hz$. Light of $\lambda = 4000 \ \mathring{A}$ falls on its surface. Which of the following statements is correct?

A
No photoelectric emission takes place
B
Photo-electrons come out with zero speed
C
Photo-electrons come out with $10^3 \ m/s$ speed
D
Photo-electrons come out with $10^5 \ m/s$ speed

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Class 12 Questions

Class 12

Physics Questions

Chapter

Dual Nature of Radiation and Matter

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Photoelectric Effect by Lenard and it's Observations

$A$ point source of light is used in an experiment of photoelectric effect. If the distance between the source and the photoelectric surface is doubled, which of the following may result?

MediumWBJEE 2020

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When monochromatic radiation of intensity $I$ falls on a metal surface, the number of photoelectrons and their maximum kinetic energy are $N$ and $K$ respectively. If the intensity of radiation is $2I$, the number of emitted electrons and their maximum kinetic energy are respectively

MediumAIPMT 2010

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The value of the stopping potential in the following diagram is ......... $V$.

Easy

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When a monochromatic point source of light is at a distance of $0.2\, m$ from a photoelectric cell,the cut-off voltage and the saturation current are respectively $0.6\, V$ and $18.0\, mA$. If the same source is placed $0.6\, m$ away from the photoelectric cell,then

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What is the intensity of radiation (light)?

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Threshold frequency for a metal is $10^{15} \ Hz$. Light of $\lambda = 4000 \ \mathring{A}$ falls on its surface. Which of the following statements is correct?

Similar Questions

$A$ point source of light is used in an experiment of photoelectric effect. If the distance between the source and the photoelectric surface is doubled, which of the following may result?

When monochromatic radiation of intensity $I$ falls on a metal surface, the number of photoelectrons and their maximum kinetic energy are $N$ and $K$ respectively. If the intensity of radiation is $2I$, the number of emitted electrons and their maximum kinetic energy are respectively

The value of the stopping potential in the following diagram is ......... $V$.

When a monochromatic point source of light is at a distance of $0.2\, m$ from a photoelectric cell,the cut-off voltage and the saturation current are respectively $0.6\, V$ and $18.0\, mA$. If the same source is placed $0.6\, m$ away from the photoelectric cell,then

What is the intensity of radiation (light)?

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