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971
The force experienced by a current-carrying conductor move in a magnetic field is employed in the working of the i. moving coil ammeter ii. electric bell iii. electric motor. Which of the statements above are correct?
  • A. i and ii only
  • B. ii and iii only
  • C. i and iii only
  • D. i, ii and iii
View Answer & Discuss (1) WAEC 2006
972
The breaking up of an atomic nucleus into the fragment of nearly equal size is known as
  • A. nuclear fusion
  • B. nuclear fission
  • C. thermonuclear reaction
  • D. natural radioactivity
View Answer & Discuss WAEC 2006
973

A 500kV is applied across an X-ray tube. Calculate the maximum velocity of the electrons produced [Me = 9.1 x 10\(^{-31}\)kg, e = 1.6 x 10\(^{-19}\)C]

  • A. 4.2 x 108ms-1
  • B. 1.9 x 108ms-1
  • C. 4.2 x 105ms-1
  • D. 1.8 x 105ms-1
View Answer & Discuss (9) WAEC 2006
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974
A radioactive substance of mass 768g has a half life of 3 years. After how many years does this substance leave only 6g undecayed?
  • A. 21
  • B. 18
  • C. 15
  • D. 12
View Answer & Discuss (1) WAEC 2006
975
Fusion is not usually used for generating electric power because
  • A. no energy is released when fusion takes place
  • B. very high temperatures are required to initiate fusion reaction
  • C. the raw materials needed is not easily available
  • D. heavy nuclei are involved
View Answer & Discuss (1) WAEC 2006
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