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JEE Main

IMPORTANT

Earn 100

What $(a)$ frequency, $(b)$ photon energy and $(c)$ photon momentum magnitude $(in keV c^{- 1})$ are associated with x-rays having a wavelength $35.0 pm ?$

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 46

A stream of protons, each with a speed of

0.9900 c,

are directed into a two-slit experiment where the slit separation is

5 .00 \times 10^{- 9} m .

A two-slit interference pattern is built up on the viewing screen. What is the angle between the center of the pattern and the second minimum (to either side of the center?)

HARD

JEE Main

IMPORTANT

Principles Of Physics International Student Version>Chapter 36 - Photons and Matter Waves>Problems>Q 47

Light of wavelength

2.40 pm

is directed onto a target containing free electrons.

(a)

Find the wavelength of light scattered at

30.0 °

from the incident direction.

(b)

Do the same for a scattering angle of

120 ° .

HARD

JEE Main

IMPORTANT

Principles Of Physics International Student Version>Chapter 36 - Photons and Matter Waves>Problems>Q 48

The beam emerging from a

1.5 W

argon laser

(λ = 515 nm)

has a diameter

d

3.5 mm .

The beam is focused by a lens system with an effective focal length

f_{L}

2.5 mm .

The focused beam strikes a totally absorbing screen, where it forms a circular diffraction pattern whose central disk has a radius

R

given by

1.22 f_{L} \frac{λ}{d}

. It can be shown that

84 %

of the incident energy ends up within this central disk. At what rate are photons absorbed by the screen in the central disk of the diffraction pattern?

HARD

JEE Main

IMPORTANT

Principles Of Physics International Student Version>Chapter 36 - Photons and Matter Waves>Problems>Q 49

Calculate the Compton wavelength for

(a)

an electron and

(b)

a proton. What is the photon energy for an electromagnetic wave with a wavelength equal to the Compton wavelength of

(c)

the electron and

(d)

the proton?

HARD

JEE Main

IMPORTANT

Principles Of Physics International Student Version>Chapter 36 - Photons and Matter Waves>Problems>Q 50

An electron moves through a region of the uniform electric potential of

- 200 V

with a (total) energy of

500 eV .

What are its

(a)

kinetic energy (in electron-volts),

(b)

momentum,

(c)

speed,

(d)

de Broglie wavelength and

(e)

angular wave number?

HARD

JEE Main

IMPORTANT

Principles Of Physics International Student Version>Chapter 36 - Photons and Matter Waves>Problems>Q 51

(a)

If the work function for a certain metal is

1.8 eV,

what is the stopping potential for electrons ejected from the metal when the light of wavelength

400 nm

shines on the metal?

(b)

What is the maximum speed of the ejected electrons?

MEDIUM

JEE Main

IMPORTANT

Principles Of Physics International Student Version>Chapter 36 - Photons and Matter Waves>Problems>Q 52

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

588 nm ?

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 ?

What (a) frequency, (b) photon energy and (c) photon momentum magnitude (in keV c-1) are associated with x-rays having a wavelength 35.0 pm?

Important Questions on Photons and Matter Waves

Learn and Prepare for any exam you want !

What $(a)$ frequency, $(b)$ photon energy and $(c)$ photon momentum magnitude $(in keV c^{- 1})$ are associated with x-rays having a wavelength $35.0 pm ?$