(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

Subtopic

Photoelectric Effect by Lenard and it's Observations

How are the frequency and intensity of incident radiation changed in the experiment of the photoelectric effect?

Medium

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In a photoelectric experiment,if both the intensity and frequency of the incident light are doubled,then the saturation photoelectric current

EasyKCET 2022

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In the given figure,$V$ represents the stopping potential. If $\lambda_1$ and $\lambda_2$ are the wavelengths of the incident light and $|V_2| > |V_1|$,then:

Medium

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The distance between a light source and a photoelectric cell is $d$. If the distance is decreased to $\frac{d}{2}$, then:

MediumWBJEE 2016

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The figure shows the variation of photocurrent with anode potential for a photo-sensitive surface for three different radiations. Let ${I_a}, {I_b}$ and ${I_c}$ be the intensities and ${f_a}, {f_b}$ and ${f_c}$ be the frequencies for the curves $a, b$ and $c$ respectively.

MediumIIT 2004

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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

How are the frequency and intensity of incident radiation changed in the experiment of the photoelectric effect?

In a photoelectric experiment,if both the intensity and frequency of the incident light are doubled,then the saturation photoelectric current

In the given figure,$V$ represents the stopping potential. If $\lambda_1$ and $\lambda_2$ are the wavelengths of the incident light and $|V_2| > |V_1|$,then:

The distance between a light source and a photoelectric cell is $d$. If the distance is decreased to $\frac{d}{2}$, then:

The figure shows the variation of photocurrent with anode potential for a photo-sensitive surface for three different radiations. Let ${I_a}, {I_b}$ and ${I_c}$ be the intensities and ${f_a}, {f_b}$ and ${f_c}$ be the frequencies for the curves $a, b$ and $c$ respectively.

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