Question 556:

• JAMB 1989

The electrochemical equivalent of silver is 0.0012gC^-1. If 36.0g of silver is to be deposited by electrolysis on a surface by passing a steady current for 5.0mins, the current must be

A. 6000A
B. 100A
C. 10A
D. 1A

Question 557:

• JAMB 1989

When a radiation strikes a metal surface, electrons may be ejected from the metal. The maximum kinetic energy which may be acquired by an ejected electron depend on the

A. Intensity of the radiation
B. Source of the radiation
C. Wavelength of the radiation
D. Detection device of the electron

Question 558:

• JAMB 1989

Which of the following is TRUE of the particles emitted in radioactive disintegration?

A. The alpha particle is the helium nucleus H
B. The alpha particle is lighter than the beta particle
C. The alpha particle is deflected more than the beta particle in a magnetic field
D. The beta particle is deflected more than the alpha particle in a magnetic field

Question 559:

• JAMB 1989

Eight alpha decays and six beta decays are necessary before an atom of 2 \(^{238}_{92}U\) achieves stability. The final product in the chain has an atomic number of

A. 70
B. 78
C. 82
D. 90

Question 560:

• JAMB 1989

An object is placed at 5.6 x 10^-4m in front of a converging lens of focal length 1.0 x 10^-nm. The image formed is

A. Real, Erect and magnified
B. Virtual, erect and magnified
C. Real, inverted and magnified
D. Virtual, erect and diminished