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Light Emitting Diode

For a given p...

Question

For a given photosensitive material and with a source of constant, frequency of incident radiation, how does the photocurrent vary with intensity of incident light ?

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Solution

For a constant frequency of incident radiation, the photo-current incraeses linearly with increase in intensity of incident radiation as shown in figure.

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Similar questions

Q. Explain giving reasons for the following :
(a) Photoelectric current in a photocell increases with the increase in the intensity of the incident radiation.
(b) The stopping potential

(V_{0})

varies linearly with the frequency (

ν

) of the incident radiation for a given photosensitive surface with the slope remaining the same for different surfaces.
(c) Maximum kinetic energy of the photoelectrons is independent of the intensity of incident radiation.

Q. Explain giving reasons for the following.
(a) Photoelectric current in a photocell increases with the increase in the intensity of the incident radiation.
(b) The stopping potential

(V_{0})

varies linearly with the frequency

(ν)

of the incident radiation for a given photosensitive surface with the slope remaining the same for different surfaces.
(c) Maximum kinetic energy of the photo-electrons is independent of the intensity of incident radiation.

Q. Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. If the frequency of the incident light is halved and the intensity is doubled, photoelectric current becomes :

Q. The following graph shows the variation of photocurrent for a photosensitive metal:

(a) Identify the variable X on the horizontal axis.
(b) What does the point A on the horizontal axis represent?
(c) Draw this graph for three different values of frequencies of incident radiation

v_{1}, v_{2}, a n d v_{3} (v_{1} > v_{2} > v_{3})

for same intensity.
(d) Draw this graph for three different values of intensities of incident radiation

I_{1}, I_{2} a n d I_{3} (I_{1} > I_{2} > I_{3})

having same frequency.

Q. Light of frequency

3

times the threshold frequency is incident on a photosensitive material. What will be the saturation photoelectric current, if the intensity is halved keeping frequency constant ?

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