15.2 The Physics of Music ม5

What is vibration?

• how loud a sound is
• the back and forth movement of matter
• how high or low a sound is
• the loudness or softness of a sound

when one object, vibrating at the same natural frequency of a second object, forces that second object into vibration motion, it is called

• harmonics
• frequency
• amplitude
• resonance

For a system in simple harmonic motion, which of the following is the number of cycles or vibrations in one second?

• amplitude
• period
• frequency
• revolution

Tags

NGSS.HS-PS4-1

What produces a sound?

• Something still

• Something moving

• Something resonant

• Something concsonant

The high pressure waves reflect as high pressure at the end of a....

• Closed pipe resonator

• Open pipe resonator

• Closed pipe harmonic

• Open pipe harmonic

Tags

NGSS.HS-PS4-1

Sound produced by a trumpet is caused by the vibration of...

• The horn of the instrument

• Vocal cords

• The reed in the mouthpiece

• The performers lips

What part of a sound wave is witnessed at the open end of a tube

• Amplitude

• Pitch

• Node

• Antinode

With increasing frequency, at what intervals are resonance lengths found in a closed pipe?

• Quarter wavelengths

• Half wavelengths

• Every wavelength

• Double wavelengths

Tags

NGSS.HS-PS4-1

What effect does tightning the string of a guitar have on the sound?

• The frequency is decreased

• The frequency is increased

• The amplitude is decreased

• The amplitude is increased

Tags

NGSS.HS-PS4-1

The frequency of the note Middle D is 293Hz. What length of closed pipe (to the nearest cm / at room temperature) will play the fundamental?

• 3cm

• 13cm

• 23cm

• 43cm