What is the de Broglie wavelength of a ball of mass 0 . 060 Kg moving at a speed of 1 . 0 m / s ?

The mass of ball is, m = 0.060 kg The speed of ball is, v = 1 . 0 m / s The Plank’s constant is, h = 6 . 6 × 1 0 - 34 Js . The de Broglie wavelength of the ball is, λ = h p . So, λ = h m v = 6 . 6 × 10 − 34 ( 0 . 060 ) ( 1 ) = 1 . 1 × 10 − 32 m . Therefore, the de Broglie's wavelength of this ball is 1 . 1 × 10 − 32 m . Here, the symbols have their usual meaning.

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Important Questions on Dual Nature of Radiation and Matter

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Dual Nature of Radiation and Matter>Exercise>Q 5

If the energy of a non-relativistic free electron is doubled, the frequency of the matter wave associated with it will be changed by which factor?

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Dual Nature of Radiation and Matter>Exercise>Q 7

A Photon of energy

40 eV

is incident on a metal surface. Due to this an electron having kinetic energy

37.5 eV

is emitted. The work function of metal surface is

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Dual Nature of Radiation and Matter>Exercise>Q 8

The photoelectric cut-off voltage in a certain experiment is $1.5 V$ . What is the maximum kinetic energy of photoelectrons emitted? Take, $e = 1.6 \times 10^{- 19} C$

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Dual Nature of Radiation and Matter>Exercise>Q 9

An electron and a photon each have a wavelength of

1.00 nm

. Find the energy of the photon. Take,

h = 6.626 \times 10^{- 34} Js

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

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Dual Nature of Radiation and Matter>Exercise>Q 10

The wavelength of a spectral line is

4000 Å

. Calculate its frequency and energy. Take,

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

h = 6 .6 \times 10^{- 34}

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Dual Nature of Radiation and Matter>Exercise>Q 11

An X-ray tube produces a continuous spectrum of radiation with its short wavelength of

0.66 Å

. What is the maximum energy of the photon in the radiation? Take: (

h = 6 .63 \times 10^{- 34} Js, c = 3 \times 10^{8} m / s

)

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Dual Nature of Radiation and Matter>Exercise>Q 24

In an experiment on photoelectric effect, the slope of the cut-off voltage versus frequency of incident light is found to be $4.12 \times 10^{- 15} V s$ . Calculate the value of Planck’s constant.

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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 7 - Solved Physics Paper-2>Exercise>Q 14

The emission of electrons from a metal begins when green light is incident on it. The emission of electrons will be possible for which of the following group of colours?

Light is a form of energy which travels as

Important Questions on Dual Nature of Radiation and Matter

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