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