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JEE Main

IMPORTANT

Earn 100

How fast must an electron move to have kinetic energy equal to the photon energy of the sodium light at wavelength $588 nm ?$

Important Questions on Photons and Matter Waves

HARD

JEE Main

IMPORTANT

Principles Of Physics International Student Version>Chapter 36 - Photons and Matter Waves>Problems>Q 53

A special kind of light bulb emits monochromatic light of wavelength

630 nm .

Electrical energy is supplied to it at the rate of

60 W

and the bulb is

93 %

efficient at converting that energy to light energy. How many photons are emitted by the bulb during its lifetime of

730 h ?

HARD

JEE Main

IMPORTANT

Principles Of Physics International Student Version>Chapter 36 - Photons and Matter Waves>Problems>Q 55

The stopping potential for electrons emitted from a surface illuminated by the light of wavelength

491 nm

0.710 V

. When the incident wavelength is changed to a new value, the stopping potential is

1.43 V

(a)

What is this new wavelength?

(b)

What is the work function for the surface?

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JEE Main

IMPORTANT

Principles Of Physics International Student Version>Chapter 36 - Photons and Matter Waves>Problems>Q 56

What is the photon energy for yellow light from a highway sodium lamp at a wavelength of

589 nm ?

HARD

JEE Main

IMPORTANT

Principles Of Physics International Student Version>Chapter 36 - Photons and Matter Waves>Problems>Q 58

You wish to pick an element for a photocell that will operate via the photoelectric effect with visible light. Which of the following are suitable, (work functions are in parentheses) tantalum

(4.2 eV),

tungsten

(4.5 eV),

aluminium

(4.2 eV),

barium

(2.5 eV),

lithium

(2.3 eV) ?

HARD

JEE Main

IMPORTANT

Principles Of Physics International Student Version>Chapter 36 - Photons and Matter Waves>Problems>Q 60

What is the maximum kinetic energy of electrons knocked out of a thin copper foil by Compton scattering of an incident beam of

18.3 keV

x

rays? Assume the work function is negligible.

HARD

JEE Main

IMPORTANT

Principles Of Physics International Student Version>Chapter 36 - Photons and Matter Waves>Problems>Q 61

Light strikes a sodium surface, causing photoelectric emission. The stopping potential for the ejected electrons is

5.0 V

and the work function of sodium is

2.2 eV .

What is the wavelength of the incident light?

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JEE Main

IMPORTANT

Principles Of Physics International Student Version>Chapter 36 - Photons and Matter Waves>Problems>Q 62

(a)

MeV c^{- 1},

what is the magnitude of the momentum associated with a photon having an energy equal to the electron rest energy? What are the

(b)

wavelength and

(c)

frequency of the corresponding radiation?

HARD

JEE Main

IMPORTANT

Principles Of Physics International Student Version>Chapter 36 - Photons and Matter Waves>Problems>Q 64

In a photoelectric experiment using a sodium surface, you find a stopping potential of

1.85 V

for a wavelength of

300 nm

and a stopping potential of

0.820 V

for a wavelength of

400 nm .

From these data find

(a)

a value for the Planck constant,

(b)

the work function

Φ

for sodium and

(c)

the cut-off wavelength

λ_{0}

for sodium.

How fast must an electron move to have kinetic energy equal to the photon energy of the sodium light at wavelength 588 nm?

Important Questions on Photons and Matter Waves

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How fast must an electron move to have kinetic energy equal to the photon energy of the sodium light at wavelength $588 nm ?$