آواز

Sound cannot travel through:

• 1 A vacuum
• 2 Steel
• 3 Water
• 4 Air

The speed of sound in air at room temperature is about:

• 1 340 m/s
• 2 34 m/s
• 3 300000 km/s
• 4 3400 m/s

The pitch of a sound depends on its:

• 1 Amplitude
• 2 Speed
• 3 Frequency
• 4 Medium only

The loudness of a sound depends mainly on its:

• 1 Amplitude
• 2 Speed
• 3 Wavelength
• 4 Frequency

An echo is heard when sound is:

• 1 Reflected
• 2 Refracted
• 3 Diffracted
• 4 Absorbed

The audible range of human hearing is about:

• 1 20 kHz to 200 kHz
• 2 20 Hz to 20000 Hz
• 3 2 Hz to 200 Hz
• 4 200 Hz to 2 MHz

Sound travels fastest in:

• 1 Gases
• 2 Liquids
• 3 Solids
• 4 A vacuum

A sound with a frequency above 20000 Hz is called:

• 1 Infrasound
• 2 Noise
• 3 Ultrasound
• 4 An echo

The quality of a sound that lets us tell a guitar from a flute is its:

• 1 Loudness
• 2 Pitch
• 3 Timbre
• 4 Speed

Sonar uses the reflection of:

• 1 Radio waves
• 2 Ultrasound
• 3 Infrared
• 4 Light