Английский язык. Ч.3 (Tests 10,11,12). Ильичева Н.А - 8 стр.

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8. Our knowledge of the universe …
ɚ) grows; b) grew; ɫ) is growing.
9. Since Berzelius’ time most elements … by the first one or two letters of the
English name (C for carbon, O for oxygen, H for hydrogen).
ɚ) have symbolized; b) were symbolized; ɫ) have been symbolized.
10. In the very earliest of civilization nine elements …: gold, silver, lead,
copper, tin, iron, carbon, sulfur and mercury.
ɚ) had been isolated; b) were isolated; c) are isolated.
H. Translate the following text
Waves Versus Particles; Huygen’s Principle and diffraction
That light carries energy is obvious to anyone who has focused the Sun’s rays
with a magnifying glass on a piece of paper and burnt a hole in it. But how does
light travel, and in what form is this energy carried?
Historically, this question turned out to be a difficult one. For one thing, light
does not reveal itself in any obvious was as being made up of tiny particles no
do we see tiny light waves passing by as we do water waves. The evidence
seemed to favor first one side and then the other until about 1830, when most
physicists had accepted the wave theory. By the end of the nineteenth century,
light was considered to be an electromagnetic wave. In the early twentieth
century, light was shown to have a particle nature as well. Nonetheless, the wave
theory of light retains valid and has proved very successful.
The Dutch scientist Christian Huygens (1629–1695), a contemporary of
Newton, proposed a wave theory of light that had much merit. Still useful today
is a technique he developed for predicting the future position of a wave front
when an earlier position is known. This is known as Huygen’s principle and can
be stated as follows: every point on a wave front can be considered as a source
of tiny wavelets that spread out in the forward direction at the speed of the wave
8
8. Our knowledge of the universe …
  �) grows; b) grew; �) is growing.
9. Since Berzelius’ time most elements … by the first one or two letters of the
  English name (C for carbon, O for oxygen, H for hydrogen).
  �) have symbolized; b) were symbolized; �) have been symbolized.
10. In the very earliest of civilization nine elements …: gold, silver, lead,
   copper, tin, iron, carbon, sulfur and mercury.
  �) had been isolated; b) were isolated; c) are isolated.


H. Translate the following text
         Waves Versus Particles; Huygen’s Principle and diffraction
   That light carries energy is obvious to anyone who has focused the Sun’s rays
with a magnifying glass on a piece of paper and burnt a hole in it. But how does
light travel, and in what form is this energy carried?
   Historically, this question turned out to be a difficult one. For one thing, light
does not reveal itself in any obvious was as being made up of tiny particles no
do we see tiny light waves passing by as we do water waves. The evidence
seemed to favor first one side and then the other until about 1830, when most
physicists had accepted the wave theory. By the end of the nineteenth century,
light was considered to be an electromagnetic wave. In the early twentieth
century, light was shown to have a particle nature as well. Nonetheless, the wave
theory of light retains valid and has proved very successful.
   The Dutch scientist Christian Huygens (1629–1695), a contemporary of
Newton, proposed a wave theory of light that had much merit. Still useful today
is a technique he developed for predicting the future position of a wave front
when an earlier position is known. This is known as Huygen’s principle and can
be stated as follows: every point on a wave front can be considered as a source
of tiny wavelets that spread out in the forward direction at the speed of the wave


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