Physics WAEC Past Questions

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576

An electron charge 1.6 x 10^-19C is accelerated in vacuum from rest at zero volt towards a plate at 40k V. Calculate the kinetic energy of the electron

A. 4.0 x 10^-26J
B. 4.0 x 10^-21J
C. 6.4 x 10^-20J
D. 3.2 x 10^-15J
E. 2.5 x 10^-20J

View Answer & Discuss (3) WAEC 1991

577

The half-life of a radioactive substance is 2 seconds. Calculate the decay constant

A. 0.035s^-1
B. 0.151s^-1
C. 0.347s^-1
D. 0.576s^-1
E. 1.386s^-1

View Answer & Discuss (1) WAEC 1991

578

The work function of a metal is 4.65ev and the metal is illuminated with a radiation of 6.86ev. What is the kinetic energy of the electrons ejected from the surface of the metal?