ability to perceive high frequencies diminishes
4. There are two types of waves in physics: longitudinal and transverse.
5. Solar energy is an alternative source of energy.
2.5. Найдите перевод словосочетаний на английский язык в тексте:
1. кожа барабана ________________________________________________
2. струны скрипки ______________________________________________
3. продольная волна ____________________________________________
4. человеческое ухо _____________________________________________
5. постоянная температура ______________________________________
6. эластичность и плотность ____________________________________
7. частотный диапазон __________________________________________
8. частота звуковой волны ______________________________________
9. скорость звука ________________________________________________
10. плотность среды _____________________________________________
11. частота звука ________________________________________________
2.6. Вставьте в пропуски предлоги: through/in/from, где необходимо.
1. Sound waves cannot pass _______ a vacuum.
2. All sounds originate _______ vibrating objects.
3. The vibrating objects are then passed on _______ a medium.
4. Frequency can be measured _______ physically.
5. The human ear is sensitive to sound _______ the frequency range ______ about 20 Hz.
6. The intensity of sound is measured _______ terms of the amount of power.
__________________________________________________________________
Through — сквозь/через; in — в; from — от;
__________________________________________________________________
2.7. Дайте ответы на вопросы по тексту:
1. What originates from vibrating objects?
2. How can all living beings hear sounds?
3. What are the types of waves in physics?
4. What is intensity of sound?
5. How does sound depend on medium and temperature?
2.8. Переведите предложения на русский язык письменно:
1. A sound wave consists of a series of alternate compressions and rarefactions of medium.
2. Alternate compression and rarefaction transmit kinetic energy through a medium which they pass.
3. Sound can’t pass through a vacuum.
4. Vocal cords in human throat, the skin of a drum or the strings of a violin are good examples of vibrating objects.
5. Each complete wave cycle is made up of one compression and one rarefaction.
Тема 3. Энергия излучения
3.1. Найдите перевод терминов
| 1. nature and properties | a) волновое движение |
| 2. electromagnetic radiation | b) среда |
| 3. wave motion | c) плотность среды |
| 4. medium | d) двоичная природа |
| 5. density of the medium | e) природа и свойства |
| 6. dual nature | f) общие характеристики |
| 7. common characteristics | g) электромагнитная радиация/излучение |
| 8. “particles,” or quanta | h) вакуум космоса |
| 9. vacuum of space | i) волны разной длины |
| 10. gamma rays | j) «частицы» или кванты |
| 11. different wavelengths | k) гамма лучи |
| 12. visible and infrared light | l) видимый и инфракрасный свет |
| 13. transparent | |
| 14. constant velocity |
3.2. Найдите прилагательное в каждой группе слов. Переведите
a) frequency, velocity, activity, visible, density;
b) to travel, to vary, nature, natural, naturally;
c) wavelength, field, fundamental, vacuum, ray;
d) medium,
