CRO Basics
What is the main instrument scientists use to display sound waves?
A) Microphone
B) Loudspeaker
C) Signal Generator
D) Cathode Ray Oscilloscope (CRO)
D) Cathode Ray Oscilloscope (CRO)
What is the name for the highest point of a wave?
A) Trough
B) Crest
C) Wavelength
D) Amplitude
B) Crest
The term that describes how high or low a sound is:
A) Loudness
B) Amplitude
C) Wavelength
D) Pitch
D) Pitch
The loudness of a sound is related to which property of its wave?
A) Wavelength
B) Frequency
C) Pitch
D) Amplitude
D) Amplitude
Noise-cancelling headphones work by producing their own sound waves to do this to incoming noise.
A) Amplify it
B) Record it
C) Cancel it out
D) Change its pitch
C) Cancel it out
What does a CRO convert sound energy into to display it on a screen?
A) Light Energy
B) Heat Energy
C) Electrical Signals
D) Chemical Energy
C) Electrical Signals
What is the name for the lowest point of a wave?
A) Trough
B) Crest
C) Wavelength
D) Amplitude What is a Transformer?
A) Trough
What property of a sound wave is measured in hertz (Hz)?
A) Amplitude
B) Wavelength
C) Frequency
D) Loudness
C) Frequency
A soft sound will produce a wave with a:
A) Large amplitude
B) Small amplitude
C) High frequency
D) Long wavelength
B) Small amplitude
In ultrasound imaging, high-frequency sound waves are used to create images of this.
A) The inside of the body
B) Musical notes
C) Electrical signals
D) Ocean depths
A) The inside of the body
What is the first thing you should connect to a CRO to study sound?
A) A Loudspeaker
B) A Signal Generator
C) A Microphone
D) A Power Source
C) A Microphone
What do we call the distance from the rest position to the crest of a wave?
A) Wavelength
B) Frequency
C) Amplitude
D) Pitch
C) Amplitude
A high-pitched sound, like a whistle, would produce a wave with a:
A) Long wavelength and low frequency
B) Short wavelength and high frequency
C) Large amplitude and long wavelength
D) Small amplitude and short wavelength How is the screen broken up?
B) Short wavelength and high frequency
If the same musical note is played first softly and then loudly, what changes on the CRO trace?
A) The frequency
B) The wavelength
C) The amplitude
D) The pitch
C) The amplitude
A guitarist presses a string down to make the vibrating part shorter. The sound produced will have a:
A) Lower pitch and longer wavelength
B) Higher pitch and shorter wavelength
C) Louder sound and larger amplitude
D) Softer sound and smaller amplitude
B) Higher pitch and shorter wavelength
What is the primary function of a signal generator in these sound experiments?
A) To display the waves
B) To measure the waves
C) To create and control the sound
D) To cancel out noise What is the formula for Period?
C) To create and control the sound
What is the distance between two successive crests called?
A) Amplitude
B) Frequency
C) Wavelength
D) Loudness
C) Wavelength
On a xylophone, a shorter bar will produce a sound with a:
A) Lower Pitch
B) Higher Pitch
C) Softer Sound
D) Louder Sound
B) Higher Pitch
What would you observe on a CRO screen if someone shouted instead of whispered?
A) The waves would become fewer.
B) The waves would become taller.
C) The waves would become shorter.
D) The waves would become more stretched out.
B) The waves would become taller.
If an oscilloscope trace shows a wave that is both very tall and has a very short wavelength, the sound is best described as:
A) Soft and low-pitched
B) Loud and low-pitched
C) Soft and high-pitched
D) Loud and high-pitched
D) Loud and high-pitched
What is the main limitation of the human ear that makes the CRO necessary for scientific study?
A) It cannot hear loud sounds.
B) It is not sensitive or accurate enough.
C) It cannot hear high-pitched sounds.
D) It changes the pitch of sounds. What is the formula for Frequency?
B) It is not sensitive or accurate enough.
A complete wave is defined as having one of these and one of these.
A) A crest and a wavelength
B) An amplitude and a frequency
C) A crest and a trough
D) A high pitch and a low pitch
C) A crest and a trough
If two waves are shown on a CRO screen and Wave A has more complete waves in the same time than Wave B, which has the higher pitch?
A) Wave A
B) Wave B
C) They have the same pitch
D) It cannot be determined
A) Wave A
A drummer hits a drum with a lot of force. The resulting sound wave, compared to a gentle tap, would have a:
A) Shorter wavelength and higher frequency
B) Longer wavelength and lower frequency
C) Larger amplitude and the same wavelength
D) Smaller amplitude and the same frequency
C) Larger amplitude and the same wavelength
A sound engineer sees two waves on a screen. Wave 1 has a large amplitude and low frequency. Wave 2 has a small amplitude and high frequency. Which statement is correct?
A) Wave 1 is a quiet whisper; Wave 2 is a loud shout.
B) Wave 1 is a loud drum; Wave 2 is a quiet bird chirp.
C) Wave 1 is a quiet rumble; Wave 2 is a loud siren.
D) Wave 1 is a loud tuba; Wave 2 is a quiet flute.
B) Wave 1 is a loud drum (large amplitude); Wave 2 is a quiet bird chirp (small amplitude, high frequency/pitch).