142122
Which of the following facts about the photoelectric effect can be understood without invoking the quantum concept of light propagation?
1 The rate of photoelectrons emission, when they are emitted, increases with the intensity of light used
2 There is a threshold frequency, below which no photoelectrons are emitted, no matter how long the light is thrown on the metallic surface
3 Once the frequency of light is more than the threshold frequency, photoelectrons are emitted almost instantaneously, no matter how weak the light intensity is
4 For each frequency of light, exceeding the threshold frequency of light, exceeding the threshold frequency, there is a maximum kinetic energy of the emitted electrons
Explanation:
A The rate of photoelectrons emission, when they are emitted, increases with the intensity of light used. i.e. $\mathrm{KE}_{\max }+\mathrm{h} v_{0}=\mathrm{h} v$
J and K CET-2012
Dual nature of radiation and Matter
142138
If the distance of $100 \mathrm{~W}$ lamp is increased from a photocell, the saturation current ' $i$ ' in the photocell varies with distance ' $d$ ' as:
1 $\mathrm{i} \propto \mathrm{d}^{2}$
2 $\mathrm{i} \propto \mathrm{d}$
3 i $\propto 1 / d$
4 $\mathrm{i} \propto 1 / \mathrm{d}^{2}$
Explanation:
D Photoelectric current is directly proportional to intensity. Intensity of light varies inversely to square of distance from the source. i.e. $\quad \mathrm{i} \propto \mathrm{I} \propto \frac{1}{\mathrm{~d}^{2}}$
MP PMT-2012
Dual nature of radiation and Matter
142143
In photoelectric effect, the electrons are ejected from metals if the incident light has a certain minimum
1 Wave length
2 Frequency
3 Amplitude
4 Angle of incidence
Explanation:
B In photo-electric effect, there exists a certain minimum cut-off frequency called threshold frequency, below which no emission of photoelectrons takes place. So electrons are ejected from metals if the incident light has a certain minimum frequency.
JIPMER-2008
Dual nature of radiation and Matter
142149
Which of the following are thermions?
1 Protons
2 Electrons
3 Photons
4 Positrons
Explanation:
B Thermionic emission can be defined as the phenomenon in which electrons are emitted from the surface of the metal when heat energy is applied to the metal.
142122
Which of the following facts about the photoelectric effect can be understood without invoking the quantum concept of light propagation?
1 The rate of photoelectrons emission, when they are emitted, increases with the intensity of light used
2 There is a threshold frequency, below which no photoelectrons are emitted, no matter how long the light is thrown on the metallic surface
3 Once the frequency of light is more than the threshold frequency, photoelectrons are emitted almost instantaneously, no matter how weak the light intensity is
4 For each frequency of light, exceeding the threshold frequency of light, exceeding the threshold frequency, there is a maximum kinetic energy of the emitted electrons
Explanation:
A The rate of photoelectrons emission, when they are emitted, increases with the intensity of light used. i.e. $\mathrm{KE}_{\max }+\mathrm{h} v_{0}=\mathrm{h} v$
J and K CET-2012
Dual nature of radiation and Matter
142138
If the distance of $100 \mathrm{~W}$ lamp is increased from a photocell, the saturation current ' $i$ ' in the photocell varies with distance ' $d$ ' as:
1 $\mathrm{i} \propto \mathrm{d}^{2}$
2 $\mathrm{i} \propto \mathrm{d}$
3 i $\propto 1 / d$
4 $\mathrm{i} \propto 1 / \mathrm{d}^{2}$
Explanation:
D Photoelectric current is directly proportional to intensity. Intensity of light varies inversely to square of distance from the source. i.e. $\quad \mathrm{i} \propto \mathrm{I} \propto \frac{1}{\mathrm{~d}^{2}}$
MP PMT-2012
Dual nature of radiation and Matter
142143
In photoelectric effect, the electrons are ejected from metals if the incident light has a certain minimum
1 Wave length
2 Frequency
3 Amplitude
4 Angle of incidence
Explanation:
B In photo-electric effect, there exists a certain minimum cut-off frequency called threshold frequency, below which no emission of photoelectrons takes place. So electrons are ejected from metals if the incident light has a certain minimum frequency.
JIPMER-2008
Dual nature of radiation and Matter
142149
Which of the following are thermions?
1 Protons
2 Electrons
3 Photons
4 Positrons
Explanation:
B Thermionic emission can be defined as the phenomenon in which electrons are emitted from the surface of the metal when heat energy is applied to the metal.
142122
Which of the following facts about the photoelectric effect can be understood without invoking the quantum concept of light propagation?
1 The rate of photoelectrons emission, when they are emitted, increases with the intensity of light used
2 There is a threshold frequency, below which no photoelectrons are emitted, no matter how long the light is thrown on the metallic surface
3 Once the frequency of light is more than the threshold frequency, photoelectrons are emitted almost instantaneously, no matter how weak the light intensity is
4 For each frequency of light, exceeding the threshold frequency of light, exceeding the threshold frequency, there is a maximum kinetic energy of the emitted electrons
Explanation:
A The rate of photoelectrons emission, when they are emitted, increases with the intensity of light used. i.e. $\mathrm{KE}_{\max }+\mathrm{h} v_{0}=\mathrm{h} v$
J and K CET-2012
Dual nature of radiation and Matter
142138
If the distance of $100 \mathrm{~W}$ lamp is increased from a photocell, the saturation current ' $i$ ' in the photocell varies with distance ' $d$ ' as:
1 $\mathrm{i} \propto \mathrm{d}^{2}$
2 $\mathrm{i} \propto \mathrm{d}$
3 i $\propto 1 / d$
4 $\mathrm{i} \propto 1 / \mathrm{d}^{2}$
Explanation:
D Photoelectric current is directly proportional to intensity. Intensity of light varies inversely to square of distance from the source. i.e. $\quad \mathrm{i} \propto \mathrm{I} \propto \frac{1}{\mathrm{~d}^{2}}$
MP PMT-2012
Dual nature of radiation and Matter
142143
In photoelectric effect, the electrons are ejected from metals if the incident light has a certain minimum
1 Wave length
2 Frequency
3 Amplitude
4 Angle of incidence
Explanation:
B In photo-electric effect, there exists a certain minimum cut-off frequency called threshold frequency, below which no emission of photoelectrons takes place. So electrons are ejected from metals if the incident light has a certain minimum frequency.
JIPMER-2008
Dual nature of radiation and Matter
142149
Which of the following are thermions?
1 Protons
2 Electrons
3 Photons
4 Positrons
Explanation:
B Thermionic emission can be defined as the phenomenon in which electrons are emitted from the surface of the metal when heat energy is applied to the metal.
142122
Which of the following facts about the photoelectric effect can be understood without invoking the quantum concept of light propagation?
1 The rate of photoelectrons emission, when they are emitted, increases with the intensity of light used
2 There is a threshold frequency, below which no photoelectrons are emitted, no matter how long the light is thrown on the metallic surface
3 Once the frequency of light is more than the threshold frequency, photoelectrons are emitted almost instantaneously, no matter how weak the light intensity is
4 For each frequency of light, exceeding the threshold frequency of light, exceeding the threshold frequency, there is a maximum kinetic energy of the emitted electrons
Explanation:
A The rate of photoelectrons emission, when they are emitted, increases with the intensity of light used. i.e. $\mathrm{KE}_{\max }+\mathrm{h} v_{0}=\mathrm{h} v$
J and K CET-2012
Dual nature of radiation and Matter
142138
If the distance of $100 \mathrm{~W}$ lamp is increased from a photocell, the saturation current ' $i$ ' in the photocell varies with distance ' $d$ ' as:
1 $\mathrm{i} \propto \mathrm{d}^{2}$
2 $\mathrm{i} \propto \mathrm{d}$
3 i $\propto 1 / d$
4 $\mathrm{i} \propto 1 / \mathrm{d}^{2}$
Explanation:
D Photoelectric current is directly proportional to intensity. Intensity of light varies inversely to square of distance from the source. i.e. $\quad \mathrm{i} \propto \mathrm{I} \propto \frac{1}{\mathrm{~d}^{2}}$
MP PMT-2012
Dual nature of radiation and Matter
142143
In photoelectric effect, the electrons are ejected from metals if the incident light has a certain minimum
1 Wave length
2 Frequency
3 Amplitude
4 Angle of incidence
Explanation:
B In photo-electric effect, there exists a certain minimum cut-off frequency called threshold frequency, below which no emission of photoelectrons takes place. So electrons are ejected from metals if the incident light has a certain minimum frequency.
JIPMER-2008
Dual nature of radiation and Matter
142149
Which of the following are thermions?
1 Protons
2 Electrons
3 Photons
4 Positrons
Explanation:
B Thermionic emission can be defined as the phenomenon in which electrons are emitted from the surface of the metal when heat energy is applied to the metal.
