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2009 - WAEC Physics Past Questions and Answers - page 5

41

An inductor of inductance 1.0H is connected in series with a capacitor of capacitance 2.0(\mu F) in an a.c. circuit. to resonate

A
112.5Hz
B
225.0Hz
C
323.5Hz
D
707.1Hz
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42

An ammeter connected to an a.c circuit records 5.5. The peak current in the circuit is

A
7.8A
B
7.1A
C
3.8A
D
3.5A
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43

Two isotopes of uranium are designed as (^{238}U) and (^{235}U). The numbers 238 and 235 represent their

A
atomic numbers
B
nucleon numbers
C
proton numbers
D
neutron numbers
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44

The main difference between between x-rays and (\gamma-rays) lies in their

A
ionizing ability
B
absorption rate
C
mode of production
D
mode of propagation
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45

An electron of mass 9.1 x 10-31 kg moves with a speed of 107ms-1. Calculate the wavelength of the associates wave[h = 6.6 x 10-34Js]

A
9.0 x 10-24m
B
4.55 x 10-17m
C
7.25 x 10-11m
D
6.20 x 10-8m
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