Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 11 - Modern Physics - I>Exercise#1>Q 24

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Light of wavelength $5000 \overset{°}{A}$ falls on a sensitive plate with the photoelectric work function of $1.9 eV$ . The kinetic energy of the emitted photoelectron will be-

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Important Questions on Modern Physics - I

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 11 - Modern Physics - I>Exercise#1>Q 25

Work function for aluminium metal is

4.125 eV .

For Photo electric effect from aluminium metal, the cut off wavelength will be-

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 11 - Modern Physics - I>Exercise#1>Q 26

A particle of mass

11 \times 10^{- 12} kg

is moving with a velocity

6 \times 10^{- 7} m s^{- 1}

. Its de-Broglie wavelength is nearly

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 11 - Modern Physics - I>Exercise#1>Q 27

The photoelectric work function of a metal is

3.3 eV

. The threshold frequency for this metal is approximately

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 11 - Modern Physics - I>Exercise#1>Q 28

If the binding energy of the electron in a hydrogen atom is

13.6 eV

the energy required to remove the electron from the first excited state of

{Li}^{2 +}

is

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 11 - Modern Physics - I>Exercise#1>Q 29

If the frequency of

K_{α}

, X -

ray of the element of atomic number

31

is

f,

then the frequency of

K_{α}

, X -

ray for atomic number

51

is

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 11 - Modern Physics - I>Exercise#1>Q 30

An electron makes a transition from orbit

n = 4

to the orbit

n = 2

of a hydrogen atom. The wave number of the emitted radiation

(R =

Rydberg's constant

)

will be

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 11 - Modern Physics - I>Exercise#1>Q 31

The maximum wavelength of radiation that can produce photoelectric effect in a certain metal is

200 nm .

The maximum kinetic energy acquired by electron due to radiation of wavelength

100 nm

will be

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 11 - Modern Physics - I>Exercise#1>Q 32

The work function of a substance is

4.0 eV

. The longest wavelength of light that can cause photoelectron emission from this substance is approximately