What does the amplitude of a sound wave determine?
loudness
What is the human audible range of hearing?
20 Hz - 20,000 Hz
Which part of the ear vibrates first when a sound wave enters?
Eardrum
What is the minimum frequency for a sound to be considered ultrasound?
20,000 Hz
What type of wave is a sound wave?
Longitudina
Which of the following is a use of ultrasound?
Measuring ocean depth
What happens to the speed of a wave if the frequency increases while the wavelength remains the same?
Increases
What happens when light travels from air into water?
It slows down and bends
What type of sound is below the human hearing range (below 20 Hz)?
Infrasound
What is the correct order of visible light colors in a rainbow?
Red, Orange, Yellow, Green, Blue, Indigo, Violet
In which medium can sound not travel?
vacuum
If the speed of sound in steel is 5000 m/s, how long will it take for a sound wave to travel 2 km through steel?
0.4 seconds
What is the unit of frequency?
Hertz
A wave has a frequency of 250 Hz and a wavelength of 4 m. Calculate its speed?
1000 m/s
A tuning fork produces a sound with a frequency of 500 Hz and a wavelength of 0.68 m. Calculate the speed of the sound wave.
340 m/s
What is an echo?
A sound that is reflected back
If a wave has a wavelength of 2 m and a frequency of 5 Hz, what is its speed?
10 m/s
A sonar system sends out a sound pulse and detects the reflected signal after 2 seconds. If the speed of sound in water is 1500 m/s, how deep is the water?
3000 m
A sound wave with a high frequency has _______ pitch
high
Sounds louder than __ dB can cause hearing damag
120
Why does sound travel faster in solids than in gases?
Because molecules in solids are closer together
Explain why a pencil appears bent when placed in a cup of water.
refraction
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