EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 32 - Dual Nature of Matter and Radiation>KEAM 2020>Q 2

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Among the following photosensitive substances, the one which emits electrons when it is illuminated by visible light is

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Important Questions on Dual Nature of Matter and Radiation

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 32 - Dual Nature of Matter and Radiation>KEAM 2019>Q 3

The work function of three photosensitive materials used to build photoelectric devices are given as : Sodium $(2.75 eV),$ copper $(4.65 eV)$ and gold $(5.1 eV) .$ Which of the following statements is correct. (The frequency of visible light lies in the range $4 \times 10^{14} Hz$ to $8 \times 10^{14} Hz) ?$

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 32 - Dual Nature of Matter and Radiation>KEAM 2018>Q 4

Einstein was awarded the Nobel Prize for his work on

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 32 - Dual Nature of Matter and Radiation>KEAM 2018>Q 5

The electric field of certain radiation is given by the equation

E = 200 \{\sin (4 π \times 10^{10}) t + \sin (4 π \times 10^{15}) t\}

falls in a metal surface having work function

2 .0 eV .

The maximum kinetic energy

(in eV)

of the photoelectrons is [Planck's constant

(h) = 6.63 \times 10^{- 34} J s

and electron charge

e = 1.6 \times 10^{- 19} C

]

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 32 - Dual Nature of Matter and Radiation>KEAM 2019>Q 6

The radiation produced by a

100 W

bulb has the following property

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 32 - Dual Nature of Matter and Radiation>KEAM 2018>Q 7

An electromagnetic wave of intensity

I

is incident on a non-reflecting surface. If

C

is the speed of light in free space, then the ratio

\frac{I}{C}

is same as

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 32 - Dual Nature of Matter and Radiation>KEAM 2020>Q 8

The de Broglie wavelength of the matter wave associated with an object dropped from a height

x

, when it reaches the ground-is proportional to

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 32 - Dual Nature of Matter and Radiation>KEAM 2018>Q 9

Two particles

A

and

B

of same mass have their de-Broglie wavelengths in the ratio

X_{A} : X_{B} = K : 1 .

Their potential energies

U_{A} : U_{B} = 1 : K^{2} .

The ratio of their total energies

E_{A} : E_{B}

is

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 32 - Dual Nature of Matter and Radiation>KEAM 2018>Q 10

The de-Broglie wavelength

λ_{n}

of the electron in the

n^{t h}

orbit of hydrogen atom is