142269
The photoelectric threshold for a certain metal is $3600 \AA$. The maximum energy of the ejected photoelectrons by radiation of $2000 \AA$ is (Given \(\left.h=6.62 \times 10^{-34} \mathrm{Js}\right)\)
142270
The photoelectric current of voltage in a certain experiment is $1.5 \mathrm{~V}$. What is the maximum kinetic energy of photoelectrons emitted?
1 $24 \times 10^{-19} \mathrm{~J}$
2 $-24 \times 10^{-19} \mathrm{~J}$
3 $2.4 \times 10^{-19} \mathrm{~J}$
4 $2.04 \times 10^{-19} \mathrm{~J}$
Explanation:
C Given, $\mathrm{V}_{0}=1.5 \mathrm{~V}$ $\mathrm{e}=1.6 \times 10^{-19}$ coulomb The maximum kinetic energy of the emitted photoelectrons, $\mathrm{K}_{\max }=\mathrm{eV}_{0}$ $\mathrm{~K}_{\text {max }}=1.6 \times 10^{-19} \times 1.5$ $\mathrm{~K}_{\max }=2.4 \times 10^{-19} \mathrm{~J}$
COMEDK 2015
Dual nature of radiation and Matter
142271
Assertion: Mass of moving photon varies inversely as the wavelength. Reason: Energy of the particle
1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion. (b) If both Assertion and Reason are correct but Reason in not a correct explanation of the Assertion.
2 (c.) If the Assertion is correct but Reason is incorrect.
3 If both the Assertion and Reason are incorrect.
4 If the Assertion is incorrect but the Reason is correct. $=$ mass $\times(\text { speed of light })^{2}$
Explanation:
B According to de-Broglie equation- $\lambda=\frac{\mathrm{h}}{\mathrm{mv}}$ Where, $\lambda=$ Wavelength $\mathrm{v}=\text { Velocity }$ $\mathrm{h}=$ Planck's constant For photon, $\mathrm{v}=\mathrm{c}$ $\therefore \lambda=\frac{h}{\mathrm{mc}}$ $\text { Or } \mathrm{m}=\frac{\mathrm{h}}{\mathrm{c} \lambda}$ $\mathrm{m} \propto \frac{1}{\lambda}$ According to Einstein's mass energy equivalence- $\mathrm{E}=\mathrm{mc}^{2}$
AIIMS-2000
Dual nature of radiation and Matter
142272
Assertion: Photosensitivity of a metal is high if its work function is small. Reason: Work function $=\mathrm{hf}_{0}$ where $\mathrm{f}_{0}$ is the threshold frequency.
1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason in not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
Explanation:
B If the work function of a metal is small than is photosensitivity is high. Work function of a metal does not depend on threshold frequency. It depends on the nature of the metal.
142269
The photoelectric threshold for a certain metal is $3600 \AA$. The maximum energy of the ejected photoelectrons by radiation of $2000 \AA$ is (Given \(\left.h=6.62 \times 10^{-34} \mathrm{Js}\right)\)
142270
The photoelectric current of voltage in a certain experiment is $1.5 \mathrm{~V}$. What is the maximum kinetic energy of photoelectrons emitted?
1 $24 \times 10^{-19} \mathrm{~J}$
2 $-24 \times 10^{-19} \mathrm{~J}$
3 $2.4 \times 10^{-19} \mathrm{~J}$
4 $2.04 \times 10^{-19} \mathrm{~J}$
Explanation:
C Given, $\mathrm{V}_{0}=1.5 \mathrm{~V}$ $\mathrm{e}=1.6 \times 10^{-19}$ coulomb The maximum kinetic energy of the emitted photoelectrons, $\mathrm{K}_{\max }=\mathrm{eV}_{0}$ $\mathrm{~K}_{\text {max }}=1.6 \times 10^{-19} \times 1.5$ $\mathrm{~K}_{\max }=2.4 \times 10^{-19} \mathrm{~J}$
COMEDK 2015
Dual nature of radiation and Matter
142271
Assertion: Mass of moving photon varies inversely as the wavelength. Reason: Energy of the particle
1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion. (b) If both Assertion and Reason are correct but Reason in not a correct explanation of the Assertion.
2 (c.) If the Assertion is correct but Reason is incorrect.
3 If both the Assertion and Reason are incorrect.
4 If the Assertion is incorrect but the Reason is correct. $=$ mass $\times(\text { speed of light })^{2}$
Explanation:
B According to de-Broglie equation- $\lambda=\frac{\mathrm{h}}{\mathrm{mv}}$ Where, $\lambda=$ Wavelength $\mathrm{v}=\text { Velocity }$ $\mathrm{h}=$ Planck's constant For photon, $\mathrm{v}=\mathrm{c}$ $\therefore \lambda=\frac{h}{\mathrm{mc}}$ $\text { Or } \mathrm{m}=\frac{\mathrm{h}}{\mathrm{c} \lambda}$ $\mathrm{m} \propto \frac{1}{\lambda}$ According to Einstein's mass energy equivalence- $\mathrm{E}=\mathrm{mc}^{2}$
AIIMS-2000
Dual nature of radiation and Matter
142272
Assertion: Photosensitivity of a metal is high if its work function is small. Reason: Work function $=\mathrm{hf}_{0}$ where $\mathrm{f}_{0}$ is the threshold frequency.
1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason in not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
Explanation:
B If the work function of a metal is small than is photosensitivity is high. Work function of a metal does not depend on threshold frequency. It depends on the nature of the metal.
142269
The photoelectric threshold for a certain metal is $3600 \AA$. The maximum energy of the ejected photoelectrons by radiation of $2000 \AA$ is (Given \(\left.h=6.62 \times 10^{-34} \mathrm{Js}\right)\)
142270
The photoelectric current of voltage in a certain experiment is $1.5 \mathrm{~V}$. What is the maximum kinetic energy of photoelectrons emitted?
1 $24 \times 10^{-19} \mathrm{~J}$
2 $-24 \times 10^{-19} \mathrm{~J}$
3 $2.4 \times 10^{-19} \mathrm{~J}$
4 $2.04 \times 10^{-19} \mathrm{~J}$
Explanation:
C Given, $\mathrm{V}_{0}=1.5 \mathrm{~V}$ $\mathrm{e}=1.6 \times 10^{-19}$ coulomb The maximum kinetic energy of the emitted photoelectrons, $\mathrm{K}_{\max }=\mathrm{eV}_{0}$ $\mathrm{~K}_{\text {max }}=1.6 \times 10^{-19} \times 1.5$ $\mathrm{~K}_{\max }=2.4 \times 10^{-19} \mathrm{~J}$
COMEDK 2015
Dual nature of radiation and Matter
142271
Assertion: Mass of moving photon varies inversely as the wavelength. Reason: Energy of the particle
1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion. (b) If both Assertion and Reason are correct but Reason in not a correct explanation of the Assertion.
2 (c.) If the Assertion is correct but Reason is incorrect.
3 If both the Assertion and Reason are incorrect.
4 If the Assertion is incorrect but the Reason is correct. $=$ mass $\times(\text { speed of light })^{2}$
Explanation:
B According to de-Broglie equation- $\lambda=\frac{\mathrm{h}}{\mathrm{mv}}$ Where, $\lambda=$ Wavelength $\mathrm{v}=\text { Velocity }$ $\mathrm{h}=$ Planck's constant For photon, $\mathrm{v}=\mathrm{c}$ $\therefore \lambda=\frac{h}{\mathrm{mc}}$ $\text { Or } \mathrm{m}=\frac{\mathrm{h}}{\mathrm{c} \lambda}$ $\mathrm{m} \propto \frac{1}{\lambda}$ According to Einstein's mass energy equivalence- $\mathrm{E}=\mathrm{mc}^{2}$
AIIMS-2000
Dual nature of radiation and Matter
142272
Assertion: Photosensitivity of a metal is high if its work function is small. Reason: Work function $=\mathrm{hf}_{0}$ where $\mathrm{f}_{0}$ is the threshold frequency.
1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason in not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
Explanation:
B If the work function of a metal is small than is photosensitivity is high. Work function of a metal does not depend on threshold frequency. It depends on the nature of the metal.
142269
The photoelectric threshold for a certain metal is $3600 \AA$. The maximum energy of the ejected photoelectrons by radiation of $2000 \AA$ is (Given \(\left.h=6.62 \times 10^{-34} \mathrm{Js}\right)\)
142270
The photoelectric current of voltage in a certain experiment is $1.5 \mathrm{~V}$. What is the maximum kinetic energy of photoelectrons emitted?
1 $24 \times 10^{-19} \mathrm{~J}$
2 $-24 \times 10^{-19} \mathrm{~J}$
3 $2.4 \times 10^{-19} \mathrm{~J}$
4 $2.04 \times 10^{-19} \mathrm{~J}$
Explanation:
C Given, $\mathrm{V}_{0}=1.5 \mathrm{~V}$ $\mathrm{e}=1.6 \times 10^{-19}$ coulomb The maximum kinetic energy of the emitted photoelectrons, $\mathrm{K}_{\max }=\mathrm{eV}_{0}$ $\mathrm{~K}_{\text {max }}=1.6 \times 10^{-19} \times 1.5$ $\mathrm{~K}_{\max }=2.4 \times 10^{-19} \mathrm{~J}$
COMEDK 2015
Dual nature of radiation and Matter
142271
Assertion: Mass of moving photon varies inversely as the wavelength. Reason: Energy of the particle
1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion. (b) If both Assertion and Reason are correct but Reason in not a correct explanation of the Assertion.
2 (c.) If the Assertion is correct but Reason is incorrect.
3 If both the Assertion and Reason are incorrect.
4 If the Assertion is incorrect but the Reason is correct. $=$ mass $\times(\text { speed of light })^{2}$
Explanation:
B According to de-Broglie equation- $\lambda=\frac{\mathrm{h}}{\mathrm{mv}}$ Where, $\lambda=$ Wavelength $\mathrm{v}=\text { Velocity }$ $\mathrm{h}=$ Planck's constant For photon, $\mathrm{v}=\mathrm{c}$ $\therefore \lambda=\frac{h}{\mathrm{mc}}$ $\text { Or } \mathrm{m}=\frac{\mathrm{h}}{\mathrm{c} \lambda}$ $\mathrm{m} \propto \frac{1}{\lambda}$ According to Einstein's mass energy equivalence- $\mathrm{E}=\mathrm{mc}^{2}$
AIIMS-2000
Dual nature of radiation and Matter
142272
Assertion: Photosensitivity of a metal is high if its work function is small. Reason: Work function $=\mathrm{hf}_{0}$ where $\mathrm{f}_{0}$ is the threshold frequency.
1 If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
2 If both Assertion and Reason are correct but Reason in not a correct explanation of the Assertion.
3 If the Assertion is correct but Reason is incorrect.
4 If both the Assertion and Reason are incorrect.
5 If the Assertion is incorrect but the Reason is correct.
Explanation:
B If the work function of a metal is small than is photosensitivity is high. Work function of a metal does not depend on threshold frequency. It depends on the nature of the metal.
