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Text 3 Electromagnetic Rest Mass

3.1. Before reading the text below answer the following question.

What are the following scientists famous for?

J. J. Thomson

Oliver Heaviside

George Frederick Charles Searle

Wilhelm Wien

Max Abraham

Hendrik Lorentz

3.2. For questions 1-7, read the text below and decide which answer (a, b, c or d) best fits each gap.

There were many (1)__________ in the 19th and the beginning of the 20th century - like those of J. J. Thomson (1881), Oliver Heaviside (1888), George Frederick Charles Searle (1896), - to understand how the mass of a(n) (2)__________ object varied with the velocity. Because the electromagnetic field carries part of the momentum of a moving charge, it was suspected that the mass of an electron would vary with velocity near the speed of light.

Following Searle (1896), Wilhelm Wien (1900), Max Abraham (1902), and Hendrik Lorentz (1904) concluded that the velocity dependant electromagnetic mass of a body (3)_______ is m = (4 / 3)E / c2. According to them, this relation applies to the complete mass of bodies, because any form of inertial mass was considered to be of electromagnetic (4)________. Wien went on by stating, that if it is assumed that gravitation is an electromagnetic effect too, than there has to be a(n) (6)________ proportionality between (electromagnetic) inertial mass and (electromagnetic) gravitational mass. To explain the stability of the matter-electron configuration, Poincarй in 1906 introduced some sort of pressure of non-electrical nature, which contributes the amount − (1 / 3)E / c2 to the mass of the bodies, and (7)_________ the 4/3-factor vanishes.

1 A attempts B thoughts C ideas D works

2 A charged B loaded C inspired D forced

3 A at rest B in peace C in calmness D at repose

4 A origin B spring C root D basis

5 A origin B spring C root D basis

6 A strict B severe C austere D stringent

7 A therefore B naturally C moreover D even

3.3. For questions 1-9, read the passage below. Use the word given in capitals at the end of the lines to form a word that fits in the same line. Albert Einstein

EINSTEIN, ALBERT (1897–1955)

Albert Einstein the twentieth century’s most renowned 1)……………, was born in Ulm, in the 2)………… of Warttemberg, now part of Germany, the son of Hermann Einstein, a small businessman, never very 3)……………, and Pauline Einstein (nee) Koch. In 1881 Maria, his only sibling, was born. In 1880 the family moved to Munich, where Einstein 4)…………… public school and high school, always doing well. (The story that he was a poor pupil is a myth, probably caused by his 5)…………. of formal education.) In those years he also received private violin lessons and, to comply with legal 6)……………., instruction in the elements of Judaism. As a result of this 7)……………., Einstein went through an intense religious phase at about age eleven, following 8)……………….. precepts in detail and (he later told a friend) composing songs in honor of God. A year later, this phase ended abruptly and forever as a result of his 9)……………. to popular books on science, to “the holy geometry book” (as he called it) on Euclidean geometry, to writings of Kant, and more.

1. SCIENCE

2. KING

3. SUCCESS

4. ATTENDANCE

5. LIKE

6. REQUIRE

7. INCULCATE

8. RELIGION

9. EXPOSE