Ch 11 Physics Class 10

• Definition of sound waves with examples
• Production of sound with examples
• Definition of propagation or transmission of sound.
• Definition of detection of sound with examples
• Show that the sound cannot pass through a vacuum
• Characteristics of sound
• Definition of pitch of sound with examples
• Show that pitch of sound increases with the increase of frequency.
• Definition of loudness of sound with examples.
• Definition of area of vibrating body with examples.
• Definition of amplitude of vibrating body with examples.
• Definition of distance from the vibrating body with examples.
• Definition of Quality of Sound with Examples
• Definition of sound intensity with its representation, mathematical form, and unit.
• State the Weber Fechner Law also write its Mathematical equation.
• Definition of intensity level.
• Differentiate between loudness and intensity of sound.
• Definition of musical sound with examples
• Definition of noise with examples
• Definition of speed of sound waves also write its Symbol, Mathematical form, and  unit.
• Definition of reflection of sound 
• Requirement for the reflection of sound
• Practical applications of the reflection of sound
• Derive and define Echo
• Calculate the minimum distance for Echo to be hard.
• Differentiate between echo and reverberation
• Definition of Acoustics with example also write the factors of acoustics
• Definition of Acoustics Protection with examples
• Definition of noise pollution with its unit
• Definition of Audiable frequency range
• Definition of Non-Audiable frequency range
• Types of Non-Audiable frequency range
• Definition of Infra  sound with examples
• Definition of ultrasound with examples
• Practical applications of ultrasound
• Why the waves produced by a simple pendulum are not heard?
• If a ringing bicycle Bell is held tightly by hand, It stops producing sound. why?
• Why is the intensity of an echo less than that of the original sound?
• In which medium air or water and echo is heard Sooner? and why?
• Why a sound cannot be heard on moon?
• If a person a place is air on Rails of a railroad for determination of the coming train. Why is this done and how it work?
• When you watch a thunderstorm you see the lightning first and and you hear the thunder afterward. Why is the thunder and delayed?
• If the speed of sound is dependent on frequency, would music from marching band be enjoyed?
• Why does your voice sound fuller in the shower?
• Why is it so quit after a snowfall?
• Solved Numerical of Sound Ch 11 Physics Class 10 in KPK Boards
• The sound intensity 3 m from a jackhammer is 8.20 × 10^2 Wm². What is the sound intensity level in decibels? (Use the usual reference level of Io = 1.00 × 10^-12 Wm²).
• A ship is anchored where the depth of water is 120 m. An ultrasonic signal sent to the bottom of the lake returns in 0.16 s. What is the speed of sound in water?
• A gunshot from a 0.22 rim fire rifle has an intensity of about 1 = (2.5x10^13) Io. Do we need to wear ear protection? (Considering that prolonged exposure to sounds above 85 decibels can cause hearing damage or loss).
• What sound intensity level in dB is produced by earphones that create an intensity of 4.00 × 10^2 Wm²? (Use the usual reference level Io = 1.00 × 10^-12 Wm²).
• Army man wearing binoculars see the flash from enemy tank fire 5 s before the fire is heard, he records 26°C temperature on his personal thermometer. What is the distance of the tank from him?
• Calculate the wavelengths of sounds at the extremes of the audible range, 20 Hz and 20,000 Hz, at normal room temperature of 20°C?
• Ashfaq stands between two high rise buildings A and B, such that he is at 33 m distance from building A. When he blows the whistle, he hears the first echo after 0.2 s and second echo after 0.8 s. Calculate (a) the speed of sound and (b) distance of building B from him.