SOUND

SOUND

VERY SHORT ANSWER TYPE QUESTIONS (VSAQ)

1. What is a medium? Ans :- A medium is the substance (solid, liquid, or gas) through which sound travels. 2. How d...

11. What is intensity of sound? Ans :- The amount of sound energy passing through unit area each second is called th...

21. Name the two types of mechanical waves. Ans :- The two types of mechanical waves are: (i) Transverse wave and (i...

31. How does sound travel through water? Ans :- Sound can create ripples in water when a vibrating object, like a tu...

41. What happens when you touch a vibrating tuning fork? Ans :- When you touch a vibrating tuning fork, you can feel...

SHORT ANSWER TYPE QUESTIONS (SAQ)

1. Why does sound become faint with distance? Ans :- Sound is a type of energy. As it travels away from where it com...

2. Can sound be produced in different ways, and what are some examples? Ans :- Yes, sound can be made in many ways....

3. How is sound produced and transmitted through a medium? Ans :- Sound is produced by vibrating objects, which cause...

4. What are compressions and rarefactions in sound waves? Ans :- Compressions are areas where air particles are pushe...

5. Sound requires a medium to travel? Justify experimentally. Ans :- Sound needs a medium to travel, and this can be...

6. Why is air considered the most common medium for sound? Ans :- Air is the most common medium for sound because it...

7. What are the main characteristics of sound waves? Ans :- The main characteristics of sound waves are frequency, a...

8. How does amplitude affect sound? Ans :- Amplitude affects the loudness of a sound. A sound with a larger amplitud...

9. What is the difference between loudness and intensity? Ans :- Loudness and intensity are related but different co...

10. Explain how sound is produced by your school bell. Ans :- The sound of the bell depends upon the vibration of th...

11. Why are sound waves called mechanical waves? Ans :- Mechanical waves are waves that move through a medium, which...

12. How are the wavelength and frequency of a sound wave related to its speed? Ans :- A longer wavelength means a lo...

12. What happens when sound travels in the air? Ans :- Air is made up of many tiny particles. When these particles m...

13. An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sou...

14. Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen. Why? An...

15. Discuss briefly the structure and working of the human ear? Ans :- The ear picks up sound waves and directs them...

16. If the speed of ultrasound through seawater is 1531 m/s. What is the distance of the seabed from the ship?- Ans :-...

17. How moths of certain families are able to escape capture? Ans :- Some types of moths can hear the high-pitched...

19. Give two applications of echo/reflection of sound. Ans :- (i) Ships use a method called SONAR, which uses sound...

20. What is an echo? Name two areas of its application Ans :- An echo is when a sound is repeated because the sound...

21. Why are the ceilings of concert halls curved? Ans :- Curved designs in buildings help sound travel to all areas....

22. How do we produce sound using a tuning fork, and what can we observe during this activity? Ans :- To make a soun...

23. What is the relationship between vibrations and sound production? Ans :- Vibrations are essential for making sou...

24. What is the range of frequencies associated with (a) Infrasound? Ans :- Infrasound refers to sounds that are bel...

25. Define amplitude time period and frequency of sound wave. Ans :- i. Amplitude: The amplitude of a wave is the a...

26. Give 3 uses of ultrasound. Ans :- Use of ultrasound: i. Ultrasound helps find cracks and problems in metal piece...

27. What is the function of middle ear? Ans :- The middle ear has three tiny bones called the hammer, anvil, and sti...

28. Suppose you and your friend are on the moon. Will you be able to hear any sound produced by your friend? Ans :-...

29. Which wave property determines (a) Loudness, Ans :- Loudness of sound is measured in decibels (dB). It refers to...

30. Distinguish between tone, note and noise. Ans :- ❑ Tone: A sound of single frequency is called a tone. ❑...

31. Establish the relationship between speed, wavelength and frequency of sound. Ans :- Speed of sound —» The distan...

32. Which wave property determines (a) loudness? (b) pitch? Name the characteristic of the sound which help you to dist...

33. What is SONAR? Ans :- SONAR, which stands for Sound Navigation and Ranging, is a method used to measure how deep...

34. Define wave-motion. Ans :- A wave is a movement that travels through a medium when the particles in that medium...

35. What is ‘ultrasonic’ and ‘infrasonic’ sound wave? Ans :- Sound waves with frequencies lower than what we can hea...

36. Calculate the wavelength of a sound wave whose frequency is 220 Hz and speed is 440 m/s in a given medium. Ans :-...

37. A person is listening to a tone of 500 Hz sitting at a distance of 450 m from the source of the sound. What is the t...

38. A submarine emits a sonar pulse, which returns from an underwater cliff in 1.02 s. If the speed of sound in saltwate...

39. What is sound and how is it produced? Ans :- Sound is a type of energy created by vibrations in any medium, like...

40. Why is a sound wave called a longitudinal wave? Ans :- The movement of particles is called vibration. A medium c...

41. Why are sound waves called mechanical waves? Ans :- Sound requires a medium to travel because it cannot happen i...

42. Define (a) Time Period (b) Amplitude of a wave Ans :- (a) Time period is defined as the time taken by a complet...

43. What do you understand by the loud and soft sound? Ans :- Sound is a kind of pressure that vibrates and travels...

44. What do you understand by low-pitched and high-pitched sound? Ans :- i. Low-pitched sound: This refers to a dee...

45. Why do we see light first and hear the sound later during a thunderstorm? Ans :- We often notice that we hear th...

46. Why are the ceilings of concert halls curved? Ans :- The curved design of a building helps sound reach all areas...

47. How does the sound produced by a vibrating object in a medium reach your ear? Ans :- Sound waves go into the out...

48. What are the wavelength, frequency, time period, and amplitude of a sound wave? Ans :- The wavelength of a sound...

49. Cite an experiment to show that sound needs a material medium for its propagation. Ans :- The Bell-jar experimen...

50. A tuning fork produces 1024 waves in 4 seconds. Calculate the frequency to the tuning fork. Ans :- As the tunin...

LONG ANSWER TYPE QUESTIONS (LAQ)

1. Explain how sound propagates through a medium and describe the role of compressions and rarefactions in this process...

2. Give application of ultrasound (ultrasonic waves). Ans :- Ultrasonic waves have number of uses : i. Ultrasonic...

3. What are the characteristics of sound waves, and how do they influence our perception of sound? Ans :- Sound w...

4. Write conditions for the production of an echo. Ans :- Conditions for the production of an echo are : (i) Time...

5. Give uses of multiple reflection of sound. Ans :- There are several uses of multiple reflection of sound : (i) A...

NCERT SOLUTION

Page No. 129 1. How does the sound produced by a vibrating object in a medium reach your ea...

Page No. 132 1. Which wave property determines (a) loudness, (b) pitch? Ans :-...

Page No. 133 1. Distinguish between loudness and intensity of sound. Ans :-...

Page No. 134 1. An echo is returned in 3s. What is the distance of the reflecting surface fr...

Page No. 135 1. Why are the ceilings of concert halls curved? Ans :- The ceiling...

Page No. 136 1. What is the audible range of the average human ear? Ans :- The au...

Page No. 138 1. What is sound and how is it produced? Ans :- Sound is a form of...

6. A person has a hearing range from 20 Hz to 20 kHz. what are the typical wavelengths of sound waves in air corresp...

7. Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the rati...

8. The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute Ans :-...

9. Does sound follow the same laws of reflection as light does? Explain. Ans :- Yes, sound follows the s...

10. When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting su...

11. Give two practical applications of reflection of sound waves. Ans :- Here are the uses of sound wave...

12. A stone is dropped from the top of a tower 500 m high into a pond of water at the base of the tower. When is the...

14. What is reverberation? How can it be reduced? Ans :- Reverberation is the prolonged persistence of so...

SUMMARY

Introduction 1. Every day, we hear sounds from various sources like humans talking, birds chirping, bells ringing, mac...

Production of Sound Sound is a form of energy produced by vibrating objects. When an object vibrates, it creates sound...

Propagation of Sound 1. Sound Production and Medium: i. Sound is created when objects vibrate. ii. The substance thro...

Sound Waves Are Longitudinal Waves 1. Understanding Sound Waves: Sound waves are vibrations that travel through a mediu...

Characteristics of a Sound Wave Sound waves are essential for communication and are defined by several key characterist...

Speed of Sound in Different Media 1. Definition of Sound Speed: Sound travels through different materials (called media...

Reflection of Sound 1. What is Sound Reflection? Just like how a rubber ball bounces off a wall, sound also "bounces...

Echo 1. What is an Echo? An echo happens when sound reflects back to us after bouncing off a distant surface, like a...

Reverberation 1. What is Reverberation? Reverberation happens when a sound in a large space, like a hall, keeps bounci...

Uses of Multiple Reflection of Sound 1. Megaphones, Horns, and Musical Instruments: Devices like megaphones, loudhai...

Range of Hearing 1. Human Hearing Range: Humans can hear sounds with frequencies between 20 Hz and 20,000 Hz. As we a...

Applications of Ultrasound 1. Cleaning: Ultrasound is used to clean items that are difficult to reach, like spiral tub...