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A radioactive element has a half life of 4 days. The fraction that has decayed in 16 days is?

A. \(\frac{15}{16}\)
B. \(\frac{1}{16}\)
C. \(\frac{3}{4}\)
D. \(\frac{1}{4}\)

View Answer & Discuss (17) JAMB 2006

caesium has a work function of 3 x 10-19J. the maximum energy of liberated electrons when it is illuminated by light of frequency 6.7 x 1014

HZ is?

[h = 6.6 x 1010-34Js]

A. 1.42 x 10^-19J
B. 3.00 x 10^-19J
C. 4.42 x 1010^-19J
D. 7.42 x 10^-19J

View Answer & Discuss (6) JAMB 2008

Cancerous cells can be destroyed by?

A. ultraviolet rays
B. alpha particules
C. x - rays
D. infrared rays

View Answer & Discuss (11) JAMB 2009

If the decay constant of a radioactive substance is 0.231s-\(^1\), the half-life is?

A. 3.00 s
B. 0.12 s
C. 0.33 s
D. 1.50 s

View Answer & Discuss (7) JAMB 2009

A piece of radioactive material contains 10\(^{20}\) atoms.
If the half life of the material is 20 seconds, the number of disintegration in the first second is?

A. 3.47 x 10¹⁸
B. 6.93 x 10 ²⁰
C. 3.47 x 10²⁰
D. 6.93 x 10¹⁸

View Answer & Discuss (4) JAMB 2009

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