Bài tập và Đáp Án môn vâtj lý 2 exercises quantum light

8/ The beam with a wavelength of 50 pm undergo Compton scattering with scattered angle is 60◦C.. 9/ In Compton effect, the maximum kinetic energy of the emitted electron is 3 keV.. 10/

8/

The beam with a wavelength of 50 pm

undergo Compton scattering with scattered

angle is 60◦C Calculate the kinetic energy of

electron?

9/

In Compton effect, the maximum kinetic

energy of the emitted electron is 3 keV Find

the wavelength of the incident radiation?

10/

In Compton effect, the wavelength of the incident light is equal the Compton wavelength, find the energy that the photon has transmitted to the electron?

Quiz

1 Assuming your cellular phone operates at

850 MHz, how many photons per second correspond to 600 mW for a typical cell phone

output strength? (FYI: The FCC mandates

less than 1.6 W per kilogram of tissue

(A) 76 s −1

(B) 8.5 × 108 s −1

(C) 1.06 × 1024 s −1

2 Consider the photoelectric effect for platinum which is a metal with work function

5.50 eV What is the maximum wavelength of light λ max that can be used to eject electrons

from the metal?

(A) 176 nm

(B) 225 nm

(C) 487 nm

(D) 589 nm

(E) 680 nm

3 A material illuminated with 400 nm light is

observed to yield a photoelectric current for

stopping voltages less than 1.7 V Now a new

monochromatic light source is used, and current is observed for stopping voltages less

than 1.0 V What is the wavelength of the

new light source?

(A) 0.792 nm (B) 326 nm (C) 517 nm (D) 886 nm (E) 3100 nm

4 In Compton effect, the wavelength of the

incident light is 413 nm What is the maximum

kinetic energy of the emitted electrons

(A) 8.8 × 10−6 eV

(B) 1 eV

(C) 2 eV

(D) 3.5 × 10−5 eV

5 Electromagnetic radiation with a

wavelength of 3.5 × 10−12 m is scattered

from stationary electrons and photons that

have been scattered through 50◦ are detected.

After a scattering event, the magnitude of the electron’s momentum is:

(A) 0

(B) 1.5 × 10−22 (kg · m/s) (C) 2.0 × 10−22 (kg · m/s) (D) 2.2 × 10−22 (kg · m/s) (E) 8.7 × 10−23 (kg · m/s)

ĐÁP ÁN CÂU 8

In the Compton effect, the maximum

kinetic energy of the emitted electron is 3 keV Find the wavelength of the incident radiation.

The maximum kinetic energy of the

electron corresponds to the maximum

energy transfer from the photon, which occurs when the photon is scattered at 180°.

The energy of the incident photon is:

Problem 10

In the Compton effect, the wavelength of the incident light is equal to the Compton wavelength Find the energy that the

photon has transmitted to the electron.

The Compton wavelength (λCλC) is: