C Depending on the nature of source of energy, the following methods of emission of electron are possible. If frequency of incident light is greater than a threshold value then emission of electrons is possible. (i) Thermionic emission (ii) field emission (iii) photoelectric emission
UP CPMT-2005
Dual nature of radiation and Matter
141975
From the photoelectric effect experiment, 6 . following observations are made. Identify which of these are correct.
1 A,B, D only
2 B only
3 A, C, D only
4 B, C only
Explanation:
B Some observations - The photoelectric current (same as the rate of emission of electrons) is directly proportional to the intensity of light falling on the electrode. Note from the figure below that with increasing intensity, the current increases. Also observe that as the voltage has decreased, the current also decreases. But to obtain zero current, the voltage has to be reversed to a certain $\mathrm{V}_{0}$ known as the stopping potential. The stopping potential is independent of the intensity of light. - The maximum kinetic energy increases with an increase in the frequency of light.
Shift-I
Dual nature of radiation and Matter
142132
When a proton is accelerated with 1 volt potential difference, its kinetic energy is
1 $1840 \mathrm{eV}$
2 $1 \mathrm{eV}$
3 $184 \mathrm{eV}$
4 $18400 \mathrm{eV}$
Explanation:
B Kinetic energy $\mathrm{KE}=\mathrm{qV}$ $=\mathrm{e} \times 1$ $=1 \mathrm{eV}$
SRMJEEE - 2011
Dual nature of radiation and Matter
141981
The incorrect statement among the following is (I $=$ Intensity of incident radiation. $\mathbf{f}=$ frequency of incident radiation)
1 Maximum kinetic energy of photoelectron varies linearly with $f$.
2 Maximum kinetic energy of photoelectron is independent of I.
3 Photoelectric current is directly proportional to I
4 Stopping potential is proportional to I.
Explanation:
D Maximum Kinetic Energy is given by, $\mathrm{KE}_{\max }=\mathrm{hf}-\phi_{\mathrm{o}}$ From the above relation, KE varies linearly with frequency and it is independent of intensity of light. (ii) Stopping potential is given by $\mathrm{eV}_{\mathrm{o}}=\mathrm{hf}-\phi_{\mathrm{o}}$ Stopping potential is independent of intensity. (iii) Photoelectric current in a photocell increases with the increase in the intensity of the incident radiation. Hence, stopping potential is proportional to I.
C Depending on the nature of source of energy, the following methods of emission of electron are possible. If frequency of incident light is greater than a threshold value then emission of electrons is possible. (i) Thermionic emission (ii) field emission (iii) photoelectric emission
UP CPMT-2005
Dual nature of radiation and Matter
141975
From the photoelectric effect experiment, 6 . following observations are made. Identify which of these are correct.
1 A,B, D only
2 B only
3 A, C, D only
4 B, C only
Explanation:
B Some observations - The photoelectric current (same as the rate of emission of electrons) is directly proportional to the intensity of light falling on the electrode. Note from the figure below that with increasing intensity, the current increases. Also observe that as the voltage has decreased, the current also decreases. But to obtain zero current, the voltage has to be reversed to a certain $\mathrm{V}_{0}$ known as the stopping potential. The stopping potential is independent of the intensity of light. - The maximum kinetic energy increases with an increase in the frequency of light.
Shift-I
Dual nature of radiation and Matter
142132
When a proton is accelerated with 1 volt potential difference, its kinetic energy is
1 $1840 \mathrm{eV}$
2 $1 \mathrm{eV}$
3 $184 \mathrm{eV}$
4 $18400 \mathrm{eV}$
Explanation:
B Kinetic energy $\mathrm{KE}=\mathrm{qV}$ $=\mathrm{e} \times 1$ $=1 \mathrm{eV}$
SRMJEEE - 2011
Dual nature of radiation and Matter
141981
The incorrect statement among the following is (I $=$ Intensity of incident radiation. $\mathbf{f}=$ frequency of incident radiation)
1 Maximum kinetic energy of photoelectron varies linearly with $f$.
2 Maximum kinetic energy of photoelectron is independent of I.
3 Photoelectric current is directly proportional to I
4 Stopping potential is proportional to I.
Explanation:
D Maximum Kinetic Energy is given by, $\mathrm{KE}_{\max }=\mathrm{hf}-\phi_{\mathrm{o}}$ From the above relation, KE varies linearly with frequency and it is independent of intensity of light. (ii) Stopping potential is given by $\mathrm{eV}_{\mathrm{o}}=\mathrm{hf}-\phi_{\mathrm{o}}$ Stopping potential is independent of intensity. (iii) Photoelectric current in a photocell increases with the increase in the intensity of the incident radiation. Hence, stopping potential is proportional to I.
C Depending on the nature of source of energy, the following methods of emission of electron are possible. If frequency of incident light is greater than a threshold value then emission of electrons is possible. (i) Thermionic emission (ii) field emission (iii) photoelectric emission
UP CPMT-2005
Dual nature of radiation and Matter
141975
From the photoelectric effect experiment, 6 . following observations are made. Identify which of these are correct.
1 A,B, D only
2 B only
3 A, C, D only
4 B, C only
Explanation:
B Some observations - The photoelectric current (same as the rate of emission of electrons) is directly proportional to the intensity of light falling on the electrode. Note from the figure below that with increasing intensity, the current increases. Also observe that as the voltage has decreased, the current also decreases. But to obtain zero current, the voltage has to be reversed to a certain $\mathrm{V}_{0}$ known as the stopping potential. The stopping potential is independent of the intensity of light. - The maximum kinetic energy increases with an increase in the frequency of light.
Shift-I
Dual nature of radiation and Matter
142132
When a proton is accelerated with 1 volt potential difference, its kinetic energy is
1 $1840 \mathrm{eV}$
2 $1 \mathrm{eV}$
3 $184 \mathrm{eV}$
4 $18400 \mathrm{eV}$
Explanation:
B Kinetic energy $\mathrm{KE}=\mathrm{qV}$ $=\mathrm{e} \times 1$ $=1 \mathrm{eV}$
SRMJEEE - 2011
Dual nature of radiation and Matter
141981
The incorrect statement among the following is (I $=$ Intensity of incident radiation. $\mathbf{f}=$ frequency of incident radiation)
1 Maximum kinetic energy of photoelectron varies linearly with $f$.
2 Maximum kinetic energy of photoelectron is independent of I.
3 Photoelectric current is directly proportional to I
4 Stopping potential is proportional to I.
Explanation:
D Maximum Kinetic Energy is given by, $\mathrm{KE}_{\max }=\mathrm{hf}-\phi_{\mathrm{o}}$ From the above relation, KE varies linearly with frequency and it is independent of intensity of light. (ii) Stopping potential is given by $\mathrm{eV}_{\mathrm{o}}=\mathrm{hf}-\phi_{\mathrm{o}}$ Stopping potential is independent of intensity. (iii) Photoelectric current in a photocell increases with the increase in the intensity of the incident radiation. Hence, stopping potential is proportional to I.
NEET Test Series from KOTA - 10 Papers In MS WORD
WhatsApp Here
Dual nature of radiation and Matter
142126
The emission of electrons is possible by
1 photoelectric effect
2 thermionic effect
3 both (a) and (b)
4 none of the above
Explanation:
C Depending on the nature of source of energy, the following methods of emission of electron are possible. If frequency of incident light is greater than a threshold value then emission of electrons is possible. (i) Thermionic emission (ii) field emission (iii) photoelectric emission
UP CPMT-2005
Dual nature of radiation and Matter
141975
From the photoelectric effect experiment, 6 . following observations are made. Identify which of these are correct.
1 A,B, D only
2 B only
3 A, C, D only
4 B, C only
Explanation:
B Some observations - The photoelectric current (same as the rate of emission of electrons) is directly proportional to the intensity of light falling on the electrode. Note from the figure below that with increasing intensity, the current increases. Also observe that as the voltage has decreased, the current also decreases. But to obtain zero current, the voltage has to be reversed to a certain $\mathrm{V}_{0}$ known as the stopping potential. The stopping potential is independent of the intensity of light. - The maximum kinetic energy increases with an increase in the frequency of light.
Shift-I
Dual nature of radiation and Matter
142132
When a proton is accelerated with 1 volt potential difference, its kinetic energy is
1 $1840 \mathrm{eV}$
2 $1 \mathrm{eV}$
3 $184 \mathrm{eV}$
4 $18400 \mathrm{eV}$
Explanation:
B Kinetic energy $\mathrm{KE}=\mathrm{qV}$ $=\mathrm{e} \times 1$ $=1 \mathrm{eV}$
SRMJEEE - 2011
Dual nature of radiation and Matter
141981
The incorrect statement among the following is (I $=$ Intensity of incident radiation. $\mathbf{f}=$ frequency of incident radiation)
1 Maximum kinetic energy of photoelectron varies linearly with $f$.
2 Maximum kinetic energy of photoelectron is independent of I.
3 Photoelectric current is directly proportional to I
4 Stopping potential is proportional to I.
Explanation:
D Maximum Kinetic Energy is given by, $\mathrm{KE}_{\max }=\mathrm{hf}-\phi_{\mathrm{o}}$ From the above relation, KE varies linearly with frequency and it is independent of intensity of light. (ii) Stopping potential is given by $\mathrm{eV}_{\mathrm{o}}=\mathrm{hf}-\phi_{\mathrm{o}}$ Stopping potential is independent of intensity. (iii) Photoelectric current in a photocell increases with the increase in the intensity of the incident radiation. Hence, stopping potential is proportional to I.
