Презентация урока-обобщение 9 класс «Световые кванты. Фотоэффект»

Review Light quanta. Photoelectric effect.

Sultanova U.R.

Physics teacher

Цели урока: Learning Objectives

• Обобщение и закрепление имеющихся знаний к разделу световые кванты
• Применение законов квантовой физики при решении задач
• ALL learners will be able to definition of quantum, photoeffect
• MOST learners will be able to know Planck’s, Einstein’s formula
• SOME learners will be able to solve problems

MAKE UP WORDS:

• hotpno
• iglht
• ptohefofetc
• aqnutmu
• orwk ufcniton
• cetlernos
• yra-x
• engery
• feruqenyc

«Запутанная таблица»

Частота

Частота

J . s

Квант энергии

Квант энергии

J . s

J

J

Работа выхода

Работа выхода

Постоянная Планка

quantum energy

m

Постоянная Планка

m

quantum energy

J

Длина волны

Planck’s constant

J

Planck’s constant

Длина волны

frequency

Hz

Кинетическая энергия

Кинетическая энергия

Hz

frequency

J

E=

kinetic energy

kinetic energy

J

work function

work function

Wavelength

Wavelength

«Let's check »

Частота

Частота

Hz

Постоянная Планка

Hz

Постоянная Планка

J . s

Работа выхода

J . s

Работа выхода

frequency

J

frequency

J

Кинетическая энергия

Кинетическая энергия

Planck’s constant

Квант энергии

J

Квант энергии

Planck’s constant

J

work function

J

Длина волны

J

work function

Длина волны

m

kinetic energy

kinetic energy

E=

m

quantum energy

quantum energy

Wavelength

Wavelength

You watch the video and complete the sentences

PHOTOELECTRIC EFFECT

Complete the sentences

• Einstein proposed that light is a kind …………… ………………….. . Light composed of elementary particles called……….. . Smallest possible energy is called……………… . The emission of……………….. from a metal surface due to electromagnetic radiation is called……………………………… . ……………… of photon is E=. …………………….. was honoured with the Nobel Prize in physics in 1921 for successfully explaining the ……………………………..

Let's check

• Einstein proposed that light is a kind electromagnetic waves . Light composed of elementary particles is called photons .. Smallest possible energy is called quantum . The emission of electrons from a metal surface due to electromagnetic radiation is called photoeffect . Energy of photon is E=. A. Einstein was honoured with the Nobel Prize in physics in 1921 for successfully explaining the photoelectric effect .

Physics in life

Solve problems

• 1.Green light radiation with a frequency 1.2 Hz. Find the energy of quantum? (2b)
• 2.What is the kinetic energy of electrons emitted from silver of work function 6.8when light of frequency Hz? (2b)
• 3. Kinetic energy of electrons emitted from the surface of a metal 2 The work function of the metal is 1.8 eV. Calculate the frequency of the metal. (4b)

Answer

• 1. E= 7.9
• 2. =3.13
• 3.

True/ false

№

№

Sentences

Sentences

1.

1.

2.

2.

True/ false

True/ false

Max Planck proposed that energy is continuous.

Max Planck proposed that energy is continuous.

Light composed of elementary particles called photon

Light composed of elementary particles called photon

3.

3.

4.

X-ray were discovered in 1895 by Genre Herz, a German physicist.

4.

X-ray were discovered in 1895 by Genre Herz, a German physicist.

The emission of protons from a metal surface due to electromagnetic radiation is called photoeffect .

The emission of protons from a metal surface due to electromagnetic radiation is called photoeffect .

5.

5.

6.

X- rays are a kind of electromagnetic radiation or waves that have wavelength shorter than 10 -8 m.

6.

X- rays are a kind of electromagnetic radiation or waves that have wavelength shorter than 10 -8 m.

Work function is the minimum frequency needed to move photoelectrons

Work function is the minimum frequency needed to move photoelectrons

7.

7.

8.

Energy of photon is E=

8.

Use of X rays in medicine and airport security.

Use of X rays in medicine and airport security.

Let's check

№

№

Sentences

Sentences

1.

1.

Max Planck proposed that energy is continuous.

2.

True/ false

True/ false

Max Planck proposed that energy is continuous.

2.

Light composed of elementary particles called photon

Light composed of elementary particles called photon

3.

3.

F

F

T

X-ray were discovered in 1895 by Genre Herz, a German physicist.

X-ray were discovered in 1895 by Genre Herz, a German physicist.

4.

T

4.

The emission of protons from a metal surface due to electromagnetic radiation is called photoeffect .

The emission of protons from a metal surface due to electromagnetic radiation is called photoeffect .

F

5.

F

5.

F

X- rays are a kind of electromagnetic radiation or waves that have wavelength shorter than 10 -8 m.

6.

6.

X- rays are a kind of electromagnetic radiation or waves that have wavelength shorter than 10 -8 m.

F

Work function is the minimum frequency needed to move photoelectrons

Work function is the minimum frequency needed to move photoelectrons

T

7.

T

7.

T

8.

8.

Energy of photon is E=

T

Use of X rays in medicine and airport security.

Use of X rays in medicine and airport security.

F

F

T

T

Критерии оценивания

• “ five”- 14-12b
• “ four” -11-9b
• “ three” -8-6b

Рефлексия