3. Name the
of sound that is described in decibel unit.
high
How are the sounds of frequencies greater than 20 kHz called?
5. A sound produces vibrations that are irregular and nonperiodic. What kind of sound is it?
SHORT-ANSWER QUESTIONS : Answer in 10-15 words
1 What is an oscillation ? What is the time taken by an oscillating body to complete one oscillation called?
2 Name the characteristics of sound. Which of these is related to the amplitude of vibration ?
3. What is the audible range ? Can we hear sound waves having frequency of about 100,000 Hz ?
4. Draw the waveform of a musical sound.
3. What is meant by the pitch of a sound ? How does the voice of a woman differ from that of a man?
Leng-ANSWER TYPE QUESTIONS : Answer in 20-25 words
1. With the help of a diagram discuss the terms:
Amplitude, Time-period and Frequency of a sound wave.
2. Sketch larynx and explain its function.
3. Draw a labelled diagram of human ear, explaining how the energy of the sound wave is transmitted to th
nerves in the cochlea.
4. What is the noise and noise pollution ? How does noise pollution affect us? How can noise pollution
reduced ?
5. How does the waveform of noise differ from that of a musical sound?
Ark (V) THE ODD-ONE OUT GIVING REASON
1. Eardrum, Oval window, Multiple refraction, Auditory nerves
2. Sound
Answers
Answer:
3. High frequency noise is 2000 Hz and above. Mid-frequency noise falls between 250 and 2000 Hz. The amplitude of sound is expressed in decibels (dB).
5. that is called noise
1. Time taken by an object to complete one oscillation is called time period. (b) Loudness is determined by the amplitude of vibration. (c) The unit of frequency is Hertz
2. Loudness of sound depends on the amplitude of vibration. Higher the amplitude of vibration, louder is the sound produced
3. Human beings can normally hear sounds with a frequency between about 20 Hz and 20,000 Hz. Sounds with frequencies below 20 hertz are called infrasound. Infrasound is too low-pitched for humans to hear. ... Bats, like the one pictured in the Figure below, can hear sounds with frequencies higher than 100,000 Hz!
2. Larynx is a part of the throat. It is responsible for production of sound. A sketch of a human larynx is shown in the following figure. ... Since vibrating objects produce sound, sound is produced due to the vibration of vocal cords.(SORRY I COULDN'T DRAW LARYNX)