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Sound

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  • Define Amplitude ?
    The maximum displacement of wave on the either side of its mean position is called amplitude .
  • Define One Hertz ?
    One Hertz is defined as one vibration per second
  • Wavelegnth is represented by ______________
    Lambda
  • What is sound ?
    Sound is a form of energy that produces the sensation of hearing in our ears is called sound
  • Birds have a ring of cartilage called ______________
    Syrinx
  • Does the velocity depend of a wave motion depend on the nature of the motion of the source ?
    No
  • Define Vocal cords ?
    Vocal Cords are a pair of thin stretchable ligaments that help us produce sound
  • What is the audible range of an average human ear ?
    An average human ear has 20Hz to 20,0000 Hz
  • Name any two uses of ultrasonic sounds ?
    It is used for relieving pain in joints and muscles , Ultrasonic sounds are used remove tartar and cavities from teeth
  • Name the sounds produced by different musical instruments through part vibration ?
    Stringed Instruments , Percussion or membrane instruments , Wind instruments and Reed Instruments
  • What do you understand from the term infrasonic sounds ?
    The sound frequency lower than 20Hz are called infrasonic sounds
  • Define Yodelling ?
    The practice of singing with an abrupt change of register from the falsetto
  • A voice of a male is more shriller than a voice of a female ?
    True
  • Name the two types of mechanical wave ?
    Tranverse wave and Longitudinal wave
  • What is the S.I unit of frequency ?
    Hertz (Hz)
  • What is echo ?
    An echo can be defined as the sound that is heard by an observer after it is reflected from a rigid surface
  • Guess which sound has a higher pitch a guitar or a car horn ? Give reason for your answer
    a car horn has a higher pitch than a guitar because sound produced by the former is more shriller than the latter
  • We can hear sounds from which frequency___________________________
    500 Hz
  • How does the sound produced by a vibrating object in a medium reach your ear ?
    When an object vibrates the surrounding particles also vibrate . These particles are adjacent to the vibrating particle forced to vibrate
  • Define Reflection of sound ?
    The process of bouncing back on the sound on a striking surface is called reflection of sound
  • Why do we cup our hands when we call our friend's name ?
    We cup our hands while calling our friend's name as the sound waves do not spread in all directions and travel in one direction
  • Do waves transport matter ?
    No
  • Sound can travel in a vacuum true or false ?
    False
  • Why do headphones have cushions on them ?
    Headphone cushions are placed so that it prevents noise isolation and the cushions prevent sound waves reflect back to the earth
  • We can distinguish a shrill sound from a flat surface by its __________________
    Pitch
  • Sound is produced when a body ________________________
    Vibrates
  • What is the unit of Amplitude ?
    metre
  • Define Pitch ?
    Pitch is the charecteristic of sound which determines the shrillness of a sound
  • What is frequency ?
    The number of times a body vibrates is called frequency
  • Which organ helps to produce sound ?
    Larynx or Voice box
  • Bees do not have voice boxes to produce sound . Still they produce sound ?
    This happens by the vibrations produced by the quick movement of their wings . Bess Buzz while flying and depositing pollen grains
  • Why are walls of the conference curved ?
    The walls of the conference halls are curved so that the sound after reflection reaches all corners uniformly
  • Sound travels faster in ________________
    Solids
  • Define Frequency
    The number of oscillations made by a wave in unit time is called frequency
  • What is the other name for long flexible spring ?
    Slinky
  • Suppose if you and your friend are on the moon . Will you able to hear the sound produced by your friend ?
    No , you will not be able to as the moon has no atmosphere , Therefore sound waves cannot travel so we cannot hear the sound
  • Do waves transport energy ?
    Yes
  • State any three charecteristics of sound ?
    Loundness , Amplitude ,Sensitivity of the ear to the sound
  • Sound is a form of energy true or false ?
    True
  • What do you understand by the term ultrasonic sounds ?
    Sounds higher than 20,000 Hz are called ultrasonic sounds
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