Question

Make 25 one word questions from chapter sound.​

Answer 1

Answer:

Sound is a mechanical energy which produces sensation of hearing. Sound is produced due to vibration of different objects.

• Sound wave propagates as compressions & rarefactions in the medium. Sound waves are longitudinal waves.

Characteristics of a Sound Wave

Sound waves are produced due to variations in pressure & density of the medium.

• Compression is the portion of the medium where a temporary increase in volume & a decrease in density takes place when a sound wave passes through the medium.

• Rarefaction is the portion of the medium where a temporary increase in volume & consequently a decease in density takes place when sound wave passes through the medium.

• Crest is the portion of the medium where the density (or pressure) has a value larger than its average value.

• Trough is the portion of the medium where the density (or pressure) has a value smaller than the average value.

• Amplitude is the magnitude of the maximum disturbance in the medium on either side of the mean position.

• Oscillation is the change in density (or pressure) from maximum value to the minimum value and again to the maximum value.

• Frequency enables us to know as to how many times a particular event occur in a given time.

• Time Period is the time taken for one complete oscillation in density (or pressure) of the medium.

• Wavelength is the distance between two consecutive compressions or two consecutive rarefactions.

Characteristics of Sound

• Loudness or intensity.

• Pitch or frequency.

• Quality or timbre.

Reflection of Sound

• An Echo is the phenomenon of repetition of sound of a source by reflection from an obstacle.

• Multiple echoes are heard when sound is repeatedly reflected from a number of obstacles at suitable distance.

• Megaphone, stethoscope ear trumpet, hearing aid etc are based on phenomenon of multiple reflection of sound.

• Reverberation is the phenomenon of persistence of audible sound after the source has stopped emitting sound.

Reverberation is reduced by carpeting the floor, upholstering furniture & covering the walls with some absorbing material like curtains etc.

Range of Frequencies

• Audible range of hearing of average human being is in the frequency range of 20Hz to 20KHz.

• Infrasound has a frequency below 20Hz. Ultrasound has a frequency above 20 kHz.

• Ultrasound finds application in industry, medical service & communications.

Human Ear

• Outer ear collects sound waves.

• Middle ear amplifies the sound waves.

• Inner ear converts the amplified sound energy into electrical energy & conveys to the brain as nerve impulse for interpretation.

Answer 2

Answer:

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Explanation:

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