Harmonics

The pictured tube is 1.2 meters long. What is the wavelength of the wave inside?

• .6 m

• 1.2 m

• 1.6 m

Tags

NGSS.HS-PS4-1

Which of the following pairs of instruments have resonant frequencies at each whole number multiple of the lowest frequency?

• a clamped string and a closed pipe

• a clamped string and an open pipe

• an open pipe and a closed pipe

• an open pipe and a reed instrument

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-5

The second harmonic of a guitar string has a frequency of 60 Hz. If the speed of waves on the string is 120 m/s, what is the string’s length?

• 1.0 m

• 2.0 m

• 3.0 m

• 4.0 m

Tags

NGSS.HS-PS4-1

Calculate the second harmonic of a clarinet (closed pipe) with length 60 cm, if the speed of sound is 343 ms^-1.

• 142 Hz

• 248

• 429 Hz

• The clarinet does not support a 2nd harmonic

Tags

NGSS.HS-PS4-1

The 4th harmonic of a guitar string has the frequency 440 Hz, what is the fundamental frequency?

• 110 Hz

• 220 Hz

• 880 Hz

• 1760 Hz

Tags

NGSS.HS-PS4-1

If you blew across an open pipe 40 cm long, causing a resonant sound, what would be the fundamental frequency of that sound? Assume the speed of sound in air is 346 ms^-1.

• 216 Hz

• 433 Hz

• 1730 Hz

• 3460 Hz

Tags

NGSS.HS-PS4-1

This wave is found in/on a

• String

• Rod

• Open Tube

• Closed pipe

Tags

NGSS.HS-PS4-1

Inductor and Capacitor in Buck converter are used to ___________

• Increase the cost

• Decrease the cost

• Filter out the harmonics

• Increase the harmonics

Tags

NGSS.HS-PS3-5

Harmonics occur when a frequency is specific to a ‘natural frequency’ of an oscillator, producing patterns. Based on the picture, which harmonic in the picture illustrates the greatest frequency?

• Fundamental

• 2nd Harmonic

• 5th Harmonic

• All have the same frequency

Tags

NGSS.HS-PS4-1

The 4th Harmonic has a wavelength of 2 meters. The fundamental harmonic has a frequency of 2 Hz. What is the speed of waves on this string?

• 4 m/s

• 8 m/s

• 16 m/s

• 20 m/s

• 32 m/s

Tags

NGSS.HS-PS4-1