An electron is moving with an initial velocity V → = V 0 i ^ and is in a uniform magnetic field B → = B 0 j ^ . Then its de Broglie wavelength

increase and decreases periodically

An electron is moving with an initial velocity V → = V 0 i ^ and is in a uniform magnetic field B → = B 0 j ^ . Then its de Broglie wavelength

increase and decreases periodically

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IMPORTANT

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The work functions of three metal $A, B$ and $C$ are $1.92 eV, 2 eV$ and $5 eV$ respectively. Which metals will emit photoelectrons for a radiation of wavelength $4100 Å ?$

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Important Questions on Dual Nature of Matter and Radiation

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IMPORTANT

Physics Crash Course JEE Main>Chapter 20 - Dual Nature of Matter and Radiation>Level 2>Q 1

The total momentum delivered (for complete absorption) of energy flux of

30 W / {cm}^{2}

falling on a non-reflecting surface of surface area

40 {cm}^{2}

at normal incidence, during

30 minutes

is found be

N \times 10^{- 4} SI

units. The value of

N

is ______.

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Physics Crash Course JEE Main>Chapter 20 - Dual Nature of Matter and Radiation>Level 2>Q 2

A sensor is exposed for time $t$ to a lamp of power $P$ placed at a distance $l$ . The sensor has an opening that is $4 d$ in diameter. Assuming all energy of the lamp is given off as light, the number of photons entering the sensor, if the wavelength of light $λ$ is (here $h$ is Planck's constant and $c$ is speed of light),

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Physics Crash Course JEE Main>Chapter 20 - Dual Nature of Matter and Radiation>Level 2>Q 3

A proton accelerated by a potential difference

V

, has de Broglie wavelength

λ

. If it is accelerated by a potential difference

4 V,

its de-Broglie wavelength will become

\frac{λ}{n}

, where

n =

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Physics Crash Course JEE Main>Chapter 20 - Dual Nature of Matter and Radiation>Level 2>Q 4

An electron is moving with an initial velocity

\vec{V} = V_{0} \hat{i}

and is in a uniform magnetic field

\vec{B} = B_{0} \hat{j}

. Then its de Broglie wavelength

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Physics Crash Course JEE Main>Chapter 20 - Dual Nature of Matter and Radiation>Level 2>Q 5

The ratio of wavelength of deuteron to that of proton accelerated by equal potential is:

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Physics Crash Course JEE Main>Chapter 20 - Dual Nature of Matter and Radiation>Level 2>Q 6

An electron microscope uses

40 keV

electrons. Find its resolving limit on the assumption that it is equal to the wavelength of the electron.

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Physics Crash Course JEE Main>Chapter 20 - Dual Nature of Matter and Radiation>Level 2>Q 7

A particle

A

of mass

m

and initial velocity

v

collides with a particle

B

of mass

\frac{m}{2}

which is at rest. The

\frac{m}{2}

collision is head on, and elastic. The ratio of the de-Broglie wavelengths

λ_{A} to λ_{B}

after the collision is :

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Physics Crash Course JEE Main>Chapter 20 - Dual Nature of Matter and Radiation>Level 2>Q 8

An electron accelerated through a potential of

10000 V

from rest has a de-Broglie wavelength

λ

. What should be the accelerating potential, so that the wavelength is doubled?

The work functions of three metal A, B and C are 1.92 eV, 2 eV and 5 eV respectively. Which metals will emit photoelectrons for a radiation of wavelength 4100 Å?

Important Questions on Dual Nature of Matter and Radiation

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The work functions of three metal $A, B$ and $C$ are $1.92 eV, 2 eV$ and $5 eV$ respectively. Which metals will emit photoelectrons for a radiation of wavelength $4100 Å ?$