1. Which of the following statement  is the least accurate? a. Ultrasonic scalers convert sound waves into mechanical vibration. b. Rotary scalers convert air pressure into mechanical vibration.  c.Sonic scalers convert air pressure into mechanical vibration. 2.All of the following statements  are accurate except: a. a disadvantage is a transient loss of sensation to, and function of, the area being blocked. b. a disadvantage is the possibility of postoperative self-inflicted injury to soft tissues as a sequel to anesthesia c. an advantage is the ability to block entire quadrants. d. no special equipment is required. 3. Which of the following terms describes widespread inflammation of the oral mucosa? a. Pharyngitis b.Gingivitis c. Stomatitis d.Glossitis

Select the correct statement in the following choices referring to standing waves on a string.Select one:a. The amplitude of the oscillation remains the same when changing the oscillation frequency.b. The frequency of resonance modes is proportional to the square root of the string's tension.c. The frequency of the standing wave is the same for all resonance modes.d. The frequency of resonance modes is proportional to the string's length.

Give an equation for the acceleration of an object executing simple harmonic motion with frequency w and displacement x. Describe how a standing wave may be generated from two running waves. Select one or more: U a. a = @x O b. A standing wave can be generated by the superposition of two waves travelling in the same direction. O c. A standing wave can be generated by the superposition of two waves travelling in opposite direction. O d. a = -Wx е. а 3 — о-х

If a 70 cm long guitar string produces a fundamental frequency of 250 Hz. What is the frequency of fourth harmonics? а. 250 Hz b. 350 Hz C. 1000 Hz d. 750 Hz

Write P if only statement A is correct, H if only statement B is correct, Y if both statements are correct and S if both statements are incorrect. 1. A. Waves are created by vibrations. B. As wave moves through a medium, the individual particles of the medium move from the source of the wave to another location some distance away 2. A. Doubling the frequency of a wave source (without altering the medium) doubles the speed of the wave. B. Amplitude and frequency affects the energy of a wave. 3. A. High frequency waves are far apart and low frequency waves are close together. B. X-ray waves are low energy waves. 4. A. You cannot reflect all waves. B. All waves are visible. 5. A. During refraction, a wave bends because it hits the edge of a barrier. B. As a wave changes media, its speed changes.

If you are playing a non-harmonic or percussion instrument and you change the number of overtones of a note, you will: A. Make the pitch sound higher. B. It is hard to say because most percussion instruments don’t have a strong sense of pitch in the first place. C. Change the pitch of the note. D. Lose all sense of pitch.

3. In general, the higher the frequency of the interfering waves, A.   the higher the wavelength B. the higher the speed of the waves C. the greater the number of nodes and antinodes D. the higher the amplitude of the waves 4. Which of the following materials should be use to make an ear protector against loud sound? A.   a material that produces sound   B.    a material that transmits sound C. a material that absorbs sound D. a material that amplifies sound

A transverse wave is traveling left to right. Which of the following is correct about the motion of particles in the wave?  a. The particles move up and down when the wave travels in a vacuum.  b. The particles move left and right when the wave travels in a medium.  c. The particles move up and down when the wave travels in a medium.  d. The particles move right and left when the wave travels in a vacuum.

Which of the following four options is the correct one Which one or more? a. A spectrogram is a graph of frequency against amplitude and time with time on the x-axis, frequency on the y-axis and amplitude indicated by brightness or colour. b. A spectrogram is a graph of amplitude on the y axis against time on the x-axis. c.   A spectrogram is a graph of frequency against amplitude and time with time on the x-axis, frequency on the y-axis and amplitude indicated by crosses. d.   A spectrogram is a graph of amplitude against frequency and time with frequency on the x-axis, time on the y-axis and amplitude indicated by brightness or colour.

The denizens of a distant planet live under an atmosphere made predominately of CO2, which is a dispersive medium. While attending a concert, which of the following would be true for a spectator seated in the back of a large amphitheatre? I. They would hear the low notes and high notes at the same time. II. They would hear the low notes and high notes at different times. III. They would hear nothing because sound can't propagate in CO2.