Advertisements
Advertisements
प्रश्न
Distinguish between loudness and intensity of sound.
Advertisements
उत्तर
| Loudness | Intensity of sound | |
| 1. | Loudness measures the ear's sensitivity to sound and can distinguish between loud and soft sounds. | The sound energy passing through a unit area in one second is called sound intensity. |
| 2. | The loudness may vary for different observers. That is, it depends on the sensitivity of the ears. | It does not depend on the sensitivity of the ears. |
| 3. | Its unit is decibel (dB). | Their unit is watt/meter or W/m2. |
| 4. | It has a subjective existence. | It has an objective existence. |
APPEARS IN
संबंधित प्रश्न
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 time interval between successive compressions from the source?
What is loudness of sound? What factors does it depend on?
What is loudness of sound? What factors does it depend on?
A stone is dropped on the surface of water in a pond. Name the type of waves produced.
Fig. shows three ways in which a string of length l in an instrument can vibrate.
 |
 |
 |
| (i) | (ii) | (iii) |
- Which of the diagram shows the principle note?
- Which vibration has the frequency four times that of the first?
- Which vibration is of the longest wavelength?
- What is the ratio of the frequency of the vibration in (i) and (ii)?
200 waves pass through a point in one second. Calculate the time period of wave.
The amplitude of the sound wave decides its
Give an example to show that light travels faster than sound?
Match the following.
| 1. | Tuning fork | The point where density of air is maximum |
| 2. | Sound | Maximum displacement from the equilibrium position. |
| 3. | Compressions | The sound whose frequency is greater than 20,000 Hz. |
| 4. | Amplitude | Longitudinal wave. |
| 5. | Ultasonics | Production of sound. |
Lightning can be seen the moment it occurs. Paheli observes lightning in her area. She hears the sound 5 s after she observed lightning. How far is she from the place where lightning occurs? (speed of sound = 330 m/s).
