Download 10th class physics chapter 11 sound exercise solved numericals pdf notes, FBISE Federal Board National Book Foundation. Fazal academy physics notes pdf are very helpful for students.
Unit 11: Sound
Numerical Problems:
Solved Numedricals PDF available at the end.
- In a busy street, traffic noise has intensity of 10^-5 Wm^-2. Find the intensity level in decibel.
- Mosquito buzzing has intensity level of 40 dB, calculate the intensity of this buzzing sound.
3. What is intensity level of threshold of hearing and threshold of pain?
- Speed of sound waves in water at 25 °C is 1480 m/s. If their wavelength is 70 cm, find the frequency of these sound waves?
- What is speed of sound at 15°C in air if speed of sound is 332 m/s at 0°C?
- Find the range of wavelengths for audible sounds if the minimum frequency is 20 Hz and maximum frequency is 20kHz.
- During thunderstorm, thunder sound is heard after 3 seconds of lightning flash. Find the distance of clouds from ground. (Speed of sound = 340 m/s)
- SONAR (sound navigation and ranging system) sends ultrasound signal towards sea bed. It is received back after 5.3 s. If speed of sound in sea water is 1550 m/s. Find the depth of sea bed.