Physics Principles and Problems 2009

Chapter 26: Electromagnetism

Standardized Test Practice

1
A cell phone is receiving electromagnetic waves with a frequency of 790 MHz. What antenna length would result in maximum signal strength?
A)4 cm
B)9 cm
C)13 cm
D)19 cm
2
A charged particle passes without deflection through a magnetic field of 0.48 T. It is balanced by an electric field of 3.8 × 103 N/C. What is the speed of the particle?
A)2.8 × 103 m/s
B)7.9 × 103 m/s
C)1.3 × 104 m/s
D)2.4 × 104 m/s
3
A beam of light has a frequency of 5.15 × 1014 Hz. What is the color of the light?

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A)blue
B)green
C)yellow
D)orange
4
Why did Thompson observe two glowing dots when he put neon gas into a cathode-ray tube?
A)The neon contained impurities.
B)The neon was made up of two different isotopes whose atoms had different chemical properties.
C)The neon was made up of two different isotopes whose atoms had different masses.
D)The neon was made up of two different isotopes whose atoms had different charges.
5
The speed of light traveling through an unknown material is 2.15 × 108 m/s. What is the dielectric constant of the unknown material?
A)0.514
B)1.12
C)1.40
D)1.95
6
A doubly ionized (2+) cesium atom passes with a velocity of 4.1 × 105 m/s through an electric field of 5.3 × 105 N/C. What magnetic field is required to prevent deflection of the atom?
A)0.41 T
B)1.3 T
C)2.1 T
D)4.2 T
7
A light wave with a wavelength of 585 nm is traveling from the Sun to Earth. What is the frequency of the wave?
A)5.13 × 10–14 Hz
B)5.13 × 1014 Hz
C)1.95 × 10–12 Hz
D)1.95 × 1012 Hz
8
The illustration below shows an electron moving with a velocity of 3.1 × 106 m/s through a magnetic field of 4.2 × 10–4 T. The path of the particle is perpendicular to the field. What is the radius, r, of the circular path that is followed by the charged particle?

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A)100 mm
B)1.0 mm
C)4.2 mm
D)2.4 mm
9
A mass spectrometer shows that the mass-to-charge ratio for an isotope is 9.2 × 107 C/kg. If the spectrometer uses a voltage of 41 V and the magnetic field is 0.095 T, what is the radius of curvature for the isotope?
A)1.0 × 10–1 m
B)1.0 × 10–3 m
C)9.9 × 10–3 m
D)9.9 × 10–5 m
10
Which of the following types of electromagnetic radiation has the lowest frequency?
A)red light
B)microwaves
C)X-rays
D)ultraviolet light
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