Physics Crash Course NEET>Chapter 19 - Dual Nature of Matter and Radiation>Level 1>Q 48

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The photoelectric threshold for a certain metal surface is $360 Å$ . If the metal surface is irradiated by a wavelength of $1100 Å$ , the kinetic energy of the emitted photoelectrons is

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Important Questions on Dual Nature of Matter and Radiation

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IMPORTANT

Physics Crash Course NEET>Chapter 19 - Dual Nature of Matter and Radiation>Level 1>Q 49

A beam of photons with an energy of

10.5 eV

strike a metal plate. The photoelectrons are emitted with maximum velocity of

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

. The work function of the metal is
(Assume mass of electron

= 9 \times 10^{- 31} kg

and Charge of electron

= 1.6 \times 10^{- 19} C

)

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Physics Crash Course NEET>Chapter 19 - Dual Nature of Matter and Radiation>Level 1>Q 50

At an incident radiation frequency of

v_{1}

, which is greater than the threshold frequency, the stopping potential for a certain metal is

V_{1}

. At frequency

2 v_{1}

the stopping potential is

3 V_{1}

. If the stopping potential at frequency

4 v_{1}

is

n V_{1}

, then

n

is

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Physics Crash Course NEET>Chapter 19 - Dual Nature of Matter and Radiation>Level 1>Q 51

Which is having minimum wavelength?

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Physics Crash Course NEET>Chapter 19 - Dual Nature of Matter and Radiation>Level 1>Q 52

When the energy of the incident radiation is increased by

20 %

, the kinetic energy of the photoelectrons emitted from a metal surface increased from

0.5 eV

to

0.8 eV

. The work function of the metal is

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Physics Crash Course NEET>Chapter 19 - Dual Nature of Matter and Radiation>Level 2>Q 1

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

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Physics Crash Course NEET>Chapter 19 - Dual Nature of Matter and Radiation>Level 2>Q 2

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 NEET>Chapter 19 - Dual Nature of Matter and Radiation>Level 2>Q 3

Electrons with de-Broglie wavelength

λ

fall on the target in an X-ray tube. The cut-off wavelength of the emitted X-ray is:

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Physics Crash Course NEET>Chapter 19 - Dual Nature of Matter and Radiation>Level 2>Q 4

For which of the following particles will it be most difficult to experimentally verify the de-Broglie relationship?