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Ch. 8 – 11 HW

Ch. 8.1 – 8.3

· Which part of an atom is positively charged, and which part is negatively charged?

· How does the charge of one electron compare with that of another electron?

· How do the masses of electrons compare with the masses of protons?

· What kind of charge does an object acquire when electrons are stripped from it?

· How is Coulomb’s law similar to Newton’s law of gravitation?

· How is Coulomb’s law different to Newton’s law of gravitation?

· How does the magnitude of electrical force between a pair of charged particles change when the particles are moved twice as far apart? Three times as far apart?

· What kind of force field surrounds an electric charge?

· What happens if an electric charge is placed in an electric field?

Ch. 9.1 – 9.6

· In what way is the rule for the interaction between magnetic poles similar to the rule for the interaction between electric charges?

· In what way are magnetic poles very different from electric charges?

· What is the origin of all magnetic fields?

· What is a magnetic domain?

· Why is iron magnetic and wood not magnetic?

· In what ways can magnets lose their strength over time?

· Name two objects that create a magnetic field.

· What effect does the Earth’s magnetic field have on the intensity of cosmic rays striking the Earth’s surface?

· What are the three ways in which voltage can be induced in a loop of wire?

· How can a car moving along a paved road activate a traffic signal?

Ch. 10.1 – 10.4

· What is the source of all waves?

· Distinguish between the period, amplitude, wavelength, and frequency of a wave.

· Does the medium in which a wave travels move with the wave? Why or why not?

· What is the relationship between frequency, wavelength, and wave speed?

· In what direction are the vibrations in a transverse wave, relative to the direction of wave travel?

· In what direction are the vibrations in a longitudinal wave, relative to the direction of wave travel?

· How does the speed of sound in water compare with the speed of sound in air?

· How does the speed of sound in steel compare with the speed of sound in air?

· Why doesn’t sound travel in a vacuum?

Ch. 11.1 – 11.5

· How are electromagnetic waves produced?

· List the frequencies of the electromagnetic spectrum in order from low to high frequencies.

· List the frequencies of the electromagnetic spectrum in order from short to long wavelengths.

· What is the principal difference between a radio wave and visible light?

· What is the fate of the energy in ultraviolet light incident on glass? Infrared light incident on glass? Visible light?

· What is the law of reflection?

· What is refraction?

· What is the angle between a light ray and its wave front?

· Which has the higher frequency: red light or blue light?

· Why is the sky blue?

· Why are sunsets red?

· Why are clouds white?