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# Ch. 25 Waves PowerPoint PPT Presentation

Ch. 25 Waves. HW 1-16. Ch. 25.1-25.2. 1. A vibration causes a wave and a wave spreads out through space. 2.The period would be 1 second. 3.The pendulum would take 1.5 seconds. 4. A longer period is produced by a longer pendulum

Ch. 25 Waves

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HW 1-16

### Ch. 25.1-25.2

• 1. A vibration causes a wave and a wave spreads out through space.

• 2.The period would be 1 second.

• 3.The pendulum would take 1.5 seconds.

• 4. A longer period is produced by a longer pendulum

• 5.A sine curve represents the periodic motion of a wave and demonstrates simple harmonic motion of the particles that transmit the wave energy.

### Ch. 25

• 6.Parts of a wave

• Amplitude equals the maximum displacement from the point of equilibrium

• Crest is the high point on a wave

• Trough is the low point on a wave

• Wavelength is the distance from one point to the next identical point on a wave

7.Period is the time it takes for one complete cycle of a wave (seconds); the frequency is the number of waves that pass a single point per unit time or the number of vibrations per second (Hertz)

### Ch. 25

• 8.No. The medium does not move along with the wave. The wave energy passes through the medium and is carried by the disturbance that travels through.

• 9.The speed of a wave is calculated by multiplying frequency by wavelength.

• 10. As the frequency of a sound increases, the wavelength decreases (inverse relationship)

### Ch. 25

• 11. Difference between transverse and longitudinal waves

• A transverse wave is produced by a vibration that is perpendicular to wave travel.

• A longitudinal wave is produced by a vibration that occurs parallel to or is in the same direction as wave travel.

### Ch. 25

• 12. Wave interference occurs when two or more waves share the same space and the amplitude of the wave either increases or decreases.

• Constructive interference: when the interference of two or more waves produce a wave with a larger amplitude

• Destructive interference: when the interference of two or more waves produce a wave with a smaller amplitude (sometimes the waves will completely cancel each other out)

• 13. Interference is a property shared by all types of waves.

### Ch. 25

• 14. A standing wave is a wave that appears to stay in one place. A standing wave forms when two waves identical in frequency, wavelength and amplitude moving in opposite directions interfere (incident and reflected waves)

• Antinodes form by constructive interference (waves build in phase) and nodes form by destructive interference (waves cancel out completely and are out-of-phase)

### Ch. 25

• 15. The Doppler Effect is an apparent shift in frequency caused by the motion of a source of a wave relative to an observer or vice-versa. As the source of a wave approaches a receiver, the receiver will encounter only an increase in wave frequency.

• 16. The Doppler Effect occurs for all waves, but is most recognizable for sound waves and light waves.

The Parts of a Wave

25.2Wave Description

A weight attached to a spring undergoes simple harmonic motion.

A marking pen attached to the bob traces a sine curve on a sheet of paper that is moving horizontally at constant speed.

A sine curve is a pictorial representation of a wave.