brodidit for students
آواز
دسویں جماعت · طبیعیات · 10 سوالات
نام: ____________________ تاریخ: ____________
Sound cannot travel through:
- A A vacuum
- B Steel
- C Water
- D Air
The speed of sound in air at room temperature is about:
- A 340 m/s
- B 34 m/s
- C 300000 km/s
- D 3400 m/s
The pitch of a sound depends on its:
- A Amplitude
- B Speed
- C Frequency
- D Medium only
The loudness of a sound depends mainly on its:
- A Amplitude
- B Speed
- C Wavelength
- D Frequency
An echo is heard when sound is:
- A Reflected
- B Refracted
- C Diffracted
- D Absorbed
The audible range of human hearing is about:
- A 20 kHz to 200 kHz
- B 20 Hz to 20000 Hz
- C 2 Hz to 200 Hz
- D 200 Hz to 2 MHz
Sound travels fastest in:
- A Gases
- B Liquids
- C Solids
- D A vacuum
A sound with a frequency above 20000 Hz is called:
- A Infrasound
- B Noise
- C Ultrasound
- D An echo
The quality of a sound that lets us tell a guitar from a flute is its:
- A Loudness
- B Pitch
- C Timbre
- D Speed
Sonar uses the reflection of:
- A Radio waves
- B Ultrasound
- C Infrared
- D Light
جوابی کلید
1. A, 2. A, 3. C, 4. A, 5. A, 6. B, 7. C, 8. C, 9. C, 10. B
Sound needs a material medium to travel.
It is about 340 m/s.
Higher frequency gives a higher pitch.
A larger amplitude gives a louder sound.
An echo is reflected sound heard after the original.
Humans hear roughly from 20 Hz to 20 kHz.
Sound travels faster in denser, stiffer media.
Ultrasound is above the audible range.
Timbre depends on the waveform.
Sonar measures depth using ultrasound echoes.