Ultraviolet light of wavelength 300 nm and intensity 1.0 watt/m2 falls on the surface of a photosensitive material. If 1% of the incident photons produce photoelectrons, then the number of photoelectrons emitted from an area of 1.0 cm2 of the surface is nearly [AMU 1995]

\[2.13\times {{10}^{11}}per\ \sec \] per sec

\[9.61\times {{10}^{14}}per\ \sec \]per sec

\[4.12\times {{10}^{13}}per\ \sec \] per sec

If assertion is true but reason is false.

\[2.13\times {{10}^{11}}per\ \sec \] per sec

Ultraviolet light of wavelength 300 nm and intensity 1.0 watt/m2 falls

1.	Ultraviolet light of wavelength 300 nm and intensity 1.0 watt/m2 falls on the surface of a photosensitive material. If 1% of the incident photons produce photoelectrons, then the number of photoelectrons emitted from an area of 1.0 cm2 of the surface is nearly [AMU 1995]
A.	\[9.61\times {{10}^{14}}per\ \sec \]per sec
B.	\[4.12\times {{10}^{13}}per\ \sec \] per sec
C.	If assertion is true but reason is false.
D.	\[2.13\times {{10}^{11}}per\ \sec \] per sec
Answer» D. \[2.13\times {{10}^{11}}per\ \sec \] per sec

Discussion

No Comment Found

Related MCQs

Assertion : X-rays cannot be diffracted by means of grating. Reason : X-rays does not obey Bragg's law.
The stopping potential V for photoelectric emission from a metal surface is plotted along Y-axis and frequency n of incident light along X-axis. A straight line is obtained as shown. Planck's constant is given by [CPMT 1987; Similar to MP PMT 2000; Kerala PET 2001]
In Thomson spectrograph experiment, four positive ions P,Q,R and S are situated on Y-X curve a shown in the figure
In the graph given below. If the slope is \[4.12\times {{10}^{-15}}\]V-sec, then value of ?h? should be
The intensity distribution of X-rays from two coolidge tubes operated on different voltages V1 and V2 and using different target materials of atomic numbers Z1 and Z2 is shown in the figure. Which one of the following inequalities is true?
The figure represents the observed intensity of X-rays emitted by an X-ray tube as a function of wavelength. The sharp peaks A and B denote [CBSE PMT 1995]
In the following arrangement y = 1.0 mm, d= 0.24 mm and D = 1.2 m. The work function of the material of the emitter is 2.2 eV. The stopping potential V needed to stop the photo current will be
Let \[{{\lambda }_{\alpha }}\], \[{{\lambda }_{\beta }}\] and \[{{{\lambda }'}_{\alpha }}\] denote the wavelengths of the X-rays of the \[{{K}_{\alpha }},\,{{K}_{\beta }}\] and \[{{L}_{\alpha }}\] lines in the characteristic X-rays for a metal
Rest mass energy of an electron is 0.51 MeV. If this electron is moving with a velocity 0.8 c (where c is velocity of light in vacuum), then kinetic energy of the electron should be.
A silver ball of radius 4.8 cm is suspended by a thread in the vacuum chamber. UV light of wavelength 200 nm is incident on the ball for some times during which a total energy of 1 ´ 10?7 J falls on the surface. Assuming on an average one out of 103 photons incident is able to eject electron. The potential on sphere will be

Ultraviolet light of wavelength 300 nm and intensity 1.0 watt/m2 falls on the surface of a photosensitive material. If 1% of the incident photons produce photoelectrons, then the number of photoelectrons emitted from an area of 1.0 cm2 of the surface is nearly [AMU 1995]

Discussion

No Comment Found

Related MCQs

Reply to Comment