What is loudness of sound? What factors does it depend on?
Solution and Explanation
Sounds with high energy are characterized as loud. The loudness of a sound is directly linked to the amplitude of vibrations, and it is proportional to the square of the amplitude of sound vibrations.
Top Questions on Propagation of Sound
- A sound wave travels at a speed of 339 ms–1. If its wavelength is 1.5 cm, what is the frequency of the wave? Will it be audible?
- CBSE Class IX
- Science
- Propagation of Sound
- 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 splash heard at the top?
Given, g = 10 ms–2 and speed of sound = 340 ms–1.- CBSE Class IX
- Science
- Propagation of Sound
- The frequency of a source of sound is 100 Hz. How many times does it vibrate in a minute?
- CBSE Class IX
- Science
- Propagation of Sound
- Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen, why?
- CBSE Class IX
- Science
- Propagation of Sound
- Why is sound wave called a longitudinal wave?
- CBSE Class IX
- Science
- Propagation of Sound
Questions Asked in CBSE Class IX exam
- Discuss what these phrases mean to you.
(i) a yellow wood
(ii) it was grassy and wanted wear
(iii) the passing there
(iv) leaves no step had trodden black
(v) how way leads on to way- CBSE Class IX
- The fun they had
- What do you think Dinamani is the name of? Give a reason for your answer.
- CBSE Class IX
- My childhood
- (i) His thoughts when he looks into the mirror
(ii) His thoughts when the snake is coiled around his arm- CBSE Class IX
- The snake and the mirror
(i) The kind of person the doctor is (money, possessions)
(ii) The kind of person he wants to be (appearance, ambition)- CBSE Class IX
- The snake and the mirror
A driver of a car travelling at \(52\) \(km \;h^{–1}\) applies the brakes Shade the area on the graph that represents the distance travelled by the car during the period.
Which part of the graph represents uniform motion of the car?- CBSE Class IX
- Graphical Representation of Motion
Concepts Used:
Sound
Sound is a vibration that propagates the mechanical wave of displacement and pressure, through a medium can be of any matter. In other words, the sound is the thin line between Music sound and Noise.
Types of Sounds:
Sound can be divided into two types depending on its frequency. The following are:-
Infrasonic Waves:
- Infrasonic waves have a frequency lower than 20 Hz. Since it is below the human hearing range, it is inaudible to humans.
- However, several other living organisms use these waves to communicate, whales, sharks, elephants, hippopotamus, etc. these waves are also used in the scientific field, it is used to study upcoming earthquakes, volcanic eruptions, human heart rates, rock formation stages, etc.
Ultrasonic waves:
- Ultrasonic waves have a frequency higher than 20 kHz. Since it is above the human hearing range, it is inaudible to humans.
- These waves are used in the scientific field, it is used to study human heart rates, to take sonograms, navigation of directions, imaging things, uniform sample mixing, communication, testing of samples, etc.