Assertion (A): In the photoelectric effect,on | vedclass

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(C) In the photoelectric effect,the intensity of light is directly proportional to the number of incident photons per unit area per unit time. Increas

Vedclass · Accepted Answer

$(A)$ and $(R)$ both are false.

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(C) In the photoelectric effect,the intensity of light is directly proportional to the number of incident photons per unit area per unit time. Increasing the intensity increases the number of emitted photoelectrons,which in turn increases the photoelectric current.However,the kinetic energy of the emitted electrons depends only on the frequency (or wavelength) of the incident light and the work function of the metal,not on the intensity.Therefore,the assertion $(A)$ is false because the kinetic energy does not increase and the photoelectric current does increase.The reason $(R)$ is also false because the photoelectric current depends on the intensity of light,not just the wavelength.Thus,both $(A)$ and $(R)$ are false.

List $I$	List $II$
$A$. Planck's constant $(h)$	$I$. $[M^1 L^2 T^{-2}]$
$B$. Stopping potential $(V_s)$	$II$. $[M^1 L^1 T^{-1}]$
$C$. Work function $(\phi)$	$III$. $[M^1 L^2 T^{-1}]$
$D$. Momentum $(p)$	$IV$. $[M^1 L^2 T^{-3} A^{-1}]$

Assertion $(A)$: In the photoelectric effect,on increasing the intensity of light,both the number of electrons emitted and the kinetic energy of each of them increase,but the photoelectric current remains unchanged.
Reason $(R)$: The photoelectric current depends only on the wavelength of light.

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Match List $I$ with List $II$:

List $I$ List $II$

$A$. Planck's constant $(h)$ $I$. $[M^1 L^2 T^{-2}]$

$B$. Stopping potential $(V_s)$ $II$. $[M^1 L^1 T^{-1}]$

$C$. Work function $(\phi)$ $III$. $[M^1 L^2 T^{-1}]$

$D$. Momentum $(p)$ $IV$. $[M^1 L^2 T^{-3} A^{-1}]$

The de Broglie wavelength of a particle moving with a speed of $0.8 c$ is equal to the wavelength of a photon. If $c$ is the speed of light in vacuum, the ratio of the energy of the photon to the kinetic energy of the particle is:

According to the particle theory of light (Newton's corpuscular theory),what is the velocity of light in a dense medium compared to that in a rare medium?

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Assertion $(A)$: In the photoelectric effect,on increasing the intensity of light,both the number of electrons emitted and the kinetic energy of each of them increase,but the photoelectric current remains unchanged.Reason $(R)$: The photoelectric current depends only on the wavelength of light.