EASY

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The photoelectric effect represent that ...........

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Important Questions on Dual Nature of Matter and Radiation

EASY

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photon Theory of Light

When the wavelength of radiation falling on a metal is changed from

500 nm to 200 nm

, the maximum kinetic energy of the photoelectrons becomes three times larger. The work function of the metal is close to:

EASY

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photon Theory of Light

The photoelectric threshold wavelength of silver is

3250 \times 10^{- 10} m

. The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength

2536 \times 10^{- 10} m

is:-

(G i v e n h = 4.14 \times 10^{- 15} eV s a n d c = 3 \times 10^{8} m s^{- 1})

EASY

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photon Theory of Light

Light of certain frequency and intensity incident on a photosensitive material causes photoelectric effect. If both the frequency and intensity are doubled, the photoelectric saturation current becomes

EASY

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photon Theory of Light

The photoelectric threshold for a certain metal surface is $360 Å$ . If the metal surface is irradiated by a wavelength of $1100 Å$ , the kinetic energy of the emitted photoelectrons is

EASY

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photon Theory of Light

Define threshold frequency.

MEDIUM

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photon Theory of Light

The frequency and the intensity of incident beam of light falling on the surface of a photoelectric material is increased by a factor of two. This will

EASY

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photon Theory of Light

In a photoelectric effect experiment, the threshold wavelength of light is

380 n m

. If the wavelength of incident light is

260 n m

, the maximum kinetic energy of emitted electrons will be
Given

E

(in

e V

)

= \frac{1237}{λ (i n n m)}

EASY

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photon Theory of Light

The maximum velocity of the photoelectron emitted by the metal surface is

v

. Charge and mass of the photoelectron is denoted by

e

and

m

respectively. The stopping potential in volt is

EASY

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photon Theory of Light

When a certain photosensitive surface is illuminated with a monochromatic light of frequency

ν,

the stopping potential of the photo current is

- \frac{V_{0}}{2} .

When the surface is illuminated by monochromatic light of frequency

\frac{ν}{2},

the stopping potential is

- V_{0} .

The threshold frequency for photoelectric emission is

EASY

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photon Theory of Light

A photoelectric surface is illuminated successively by monochromatic light of wavelength

λ

and

\frac{λ}{2}

. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface of the material is:
(

h

= Planck's constant,

c

= speed of light)

EASY

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photon Theory of Light

A beam of photons with an energy of

10.5 eV

strike a metal plate. The photoelectrons are emitted with maximum velocity of

1.6 \times 10^{6} m s^{- 1}

. The work function of the metal is
(Assume mass of electron

= 9 \times 10^{- 31} kg

and Charge of electron

= 1.6 \times 10^{- 19} C

)

MEDIUM

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photon Theory of Light

If the photoelectric effect is not seen with the ultraviolet radiations in a given metal, photo electrons may be emitted with the _____.

EASY

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photon Theory of Light

The following graph represents the variation of photo current with anode potential for a metal surface. Here $I_{1}, I_{2}$ and $I_{3}$ represents intensities and $γ_{1}, γ_{2}, γ_{3}$ represents frequency for curves $1, 2$ and $3$ respectively, then

Question Image

EASY

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photon Theory of Light

The surface of a metal is illuminated with a light of wavelength

400 nm

. The kinetic energy of the ejected photoelectrons was found to be

1.68 eV

. The work function of the metal is

(h c = 1240 eV nm)

EASY

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photon Theory of Light

In the experimental study of photoelectric effect, if

V_{0}

is the stopping potential and

v

is the frequency of the incident light on the metal the slope of graph plotted for

V_{0}

Versus

v

is (where

h, e

and

ϕ_{0}

are Planck's constant, charge of electron and work function of the metal respectively.

EASY

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photon Theory of Light

Threshold frequency for a metal is

15 \times 10^{14} Hz

. The light of wavelength

6000 Å

falls on the metal surface. Which one of the following statements is correct? [velocity of light,

c = 3 \times 10^{8} m s^{- 1}

]

EASY

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photon Theory of Light

If intensity of incident radiation in a photocell is increased, the stopping potential

EASY

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photon Theory of Light

Maximum kinetic energy of a photoelectric varies with the frequency

(f)

of the incident radiation as

MEDIUM

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photon Theory of Light

The typical electric field required for electrons to be emitted from surfaces of metals by the "field emission" process is about

MEDIUM

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photon Theory of Light

When photon of energy

4.0 eV

strikes the surface of a metal

A

, the elected photoelectrons have maximum kinetic energy

T_{A} eV

and de-Broglie wavelength

λ_{A}

. The maximum kinetic energy of photoelectron liberated from another metal

B

by photon of energy

4.50 eV

T_{B} = (T_{A} - 1.50) eV

. If the de-Broglie wavelength of these photoelectrons

λ_{B} = 2 λ_{A}

, then choose the correct statement(s).

The photoelectric effect represent that ...........

Important Questions on Dual Nature of Matter and Radiation

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