Match the List - I (Phenomenon associated with electromagnetic radiation) with List - II (Part of electromagnetic spectrum) and select the correct code from the choices given below the lists : List - I List-II I Doublet of sodium A Visible radiation II Wavelength corresponding to temperature associated with the isotropic radiation filling all space B Microwave III Wavelength emitted by atomic hydrogen in interstellar space C Short radiowave IV Wavelength of radiation arising from two close energy levels in hydrogen D X-rays

(I)-(A), (II)-(B), (III)-(C), (IV)-(C)

(I)-(D), (II)-(C), (III)-(A), (IV)-(B)

(I)-(A), (II)-(B), (III)-(B), (IV)-(C)

(I)-(B), (II)-(A), (III)-(D), (IV)-(A)

EASY

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Photo emissive cell is a type of photoelectric cell.

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Important Questions on Dual Nature of Matter and Radiation

HARD

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photoelectric Cell and Its Applications

Derive Einstein's photoelectric equation.

EASY

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photoelectric Cell and Its Applications

State Heisenberg's Uncertainty principle.

MEDIUM

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photoelectric Cell and Its Applications

The stopping potential of a metal surface is independent of:

HARD

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photoelectric Cell and Its Applications

Explain the working of photo emissive cell. Write any two applications of photoelectric cells.

EASY

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photoelectric Cell and Its Applications

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>Photoelectric Cell and Its Applications

Consider the following statements regarding the photoelectric effect experiment:

(I) Photoelectrons are emitted as soon as the metal is exposed to light.

(II) There is a minimum frequency below which no photo-current is observed.

(III) The stopping potential is proportional to the frequency of light.

(IV) The photo-current varies linearly with the intensity of the light.

Which of the above statements indicate that light consists of quanta (photons) with energy proportional to frequency?

EASY

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photoelectric Cell and Its Applications

A point source of light is used in an experiment of photoelectric effects. If the distance between the source and the photoelectric surface is doubled, which of the following may result?

MEDIUM

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photoelectric Cell and Its Applications

What is photoelectric effect?

MEDIUM

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photoelectric Cell and Its Applications

Light of frequency

1.5

times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled?

EASY

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photoelectric Cell and Its Applications

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>Photoelectric Cell and Its Applications

2 m W

laser operates at a wavelength of

500 n m

. The number of photons that will be emitted per second is:
[Given Planck's constant

h = 6.6 \times 10^{- 34} J s,

speed of light

c = 3.0 \times 10^{8} m / s

]

EASY

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photoelectric Cell and Its Applications

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>Photoelectric Cell and Its Applications

Light is incident normally on a completely absorbing surface with an energy flux of

25 W c m^{- 2}

. If the surface has an area of

25 c m^{2}

, the momentum transferred to the surface in

40 min

time duration will be:

HARD

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photoelectric Cell and Its Applications

In a photoelectric experiment under conditions of saturation current, we consider two different cross-section

A

and

B

as shown. Here,

v_{A}

and

v_{B}

represent the average speed of electrons at the two cross-sections.
Question Image

EASY

Physics>Modern Physics>Dual Nature of Matter and Radiation>Photoelectric Cell and Its Applications

Match the List - I (Phenomenon associated with electromagnetic radiation) with List - II (Part of electromagnetic spectrum) and select the correct code from the choices given below the lists :

	List - I		List-II
I	Doublet of sodium	A	Visible radiation
II	Wavelength corresponding to temperature associated with the isotropic radiation filling all space	B	Microwave
III	Wavelength emitted by atomic hydrogen in interstellar space	C	Short radiowave
IV	Wavelength of radiation arising from two close energy levels in hydrogen	D	X-rays