# Physical Science

Pages: 7 (2217 words) Published: May 20, 2012
Physical Science Review
Waves, Sound and Light
Waves-
What are Waves?
1. 1 .The substance that a move through is called a medium. 2. True or False: Particles are squeezed together during rarefactions. 3. True or False: Waves that require a medium through which to travel are called electromagnetic waves. 4. True or False: The matter in the medium moves perpendicular to a transverse wave. 5. What medium is often used to transfer computer information? Optic Fibers 6. 6 .A sound wave is made of a series of compression and rarefactions 7. Analogue signals transmit information for such things as AM/FM radio 8. A disturbance that transfers energy from place to place is called a wave 9. In a compression wave, particles in the medium move in the same direction as the wave. 10. True or False: Mechanical waves use matter to transfer energy. Characteristics of Waves

1. The frequency of a sound wave determines the pitch of the sound. 2. In a compression wave, particles in the medium move in the same direction as the wave. 3. A train of waves is moving at a speed of 30 m/s. The frequenct of the waves is 10 Hz. What is the wavelength? 3 m 4. A wave x meters long has a speed of y meters per second. The frequency of the wave is y/x hertz. 5. Tsunami waves are almost the same as ripples caused by throwing a rock into a pond. What is the major difference between the two? The energy source of tsunami waves is much greater. 6. A wave with a frequency of 0.5 Hz and a speed of 10 m/s has a wavelength of 20 m. 7. True or False: Sound waves travel faster through air than through solids. 8. The substance that a wave moves through is called a medium. 9. True or False: Particles are squeezed together during rarefactions. 10. True or False: According to the Doppler effect, light from a star moving away from Earth will have a higher frequency than light from a star moving toward Earth. Interactions of Waves

1. True or False: Constructive interference occurs when the amplitudes of two waves combine to produce a wave with a smaller amplitude. 2. What kind of process can create “rogue” waves? Constructive Interference 3. Waves combine to produce smaller or zero-amplitude wave in a process called: destructive interference. 4. True or False: The speed of sound at high altitudes, where the air is less dense, is greater than the speed of sound at low altitudes, where the air is more dense. 5. When a wave moves through an opening in a barrier, it bends and spreads out. 6. When do water waves spread out the most after passing through a gap in a barrier? Then the gap is narrow. 7. True or False: Refraction is a bending that occurs when a wave moves from one medium to another at an angle and changes speed. 8. A disturbance that transfers energy from place to place is called a wave. 9. The bending of waves around the edge of a barrier is known as diffraction. Seismic Waves

1. True or False: Tsunamis are huge ocean secondary waves caused by underwater earthquakes. 2. Waves combine to make a wave with larger amplitude in a process called: constructive interference. 3. True or False: A seismograph records the air movements caused by seismic waves. 4. Longitudinal seismic waves are known as: primary waves. 5. True or False: Sound waves travel faster through air than through solids. 6. Scientists on the side of Earth opposite the epicenter of an earthquake detect mainly P Waves. 7. Refraction occurs when a wave: enters a new medium at an angle. 8. Waves produced by earthquakes are called: Seismic Waves. 9. Secondary waves CANNOT travel through: liquids.

10. Seismic waves are generated by movement along: Faults. Topic Test Review
1. True or False: The two types of wave interference are constructive and destructive. 2. The frequency is the number of vibrations that occur in a 1-second time interval. 3. A wave x meters long had a speed of...