The Physics of Waves: Light Waves, Sound Waves and Ultrasound
What is the measure known as “sound level”?
A subjective measure of the perceived loudness of a sound (in dB)
A graph of the levels of sound of different frequencies that we perceive as equal in loudness (in phone)
The frequency of the sound that produces the loudest response in a healthy hearing mechanism (in Hz)
The objectively measured amount of sound energy carried by a sound wave (in W/m2)
A subjective measure of the perceived loudness of a sound (in dB)
Sound level is subjective, in that it is perceived by the hearer and depends on the frequency/ies of the sound. The unit is the decibel.
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The term “refraction” may be applied to which of the following?A. The effect on light rays as they enter the cornea of the eye
B. Light rays from an object meeting at a point to form a sharp image
C. A light ray travelling away from a surface at the same angle that the light ray approached the surface
D. A light ray travelling through a glass with a faster speed than it would have in air
The unit called the decibel (dB) is used in the measurement of:
A. Sound frequency (pitch)
B. Sound intensity (energy)
C. Sound pressure
D. Sound level (loudness)
In a wave, what is the distance between two adjacent troughs called?
A. The period
B. The displacement
C. The amplitude
D. The wavelength
What will a sound of frequency 250,000 Hz be?
A. Audible
B. Painful to listen to
C. Ultrasonic
D. Close to the threshold of hearing
Visible light waves are examples of:
A. Electromagnetic waves
B. Mechanical waves
C. Longitudinal waves
D. Compressional waves
Which is the BEST definition of a wave?
A. The method by which the energy carried by visible light is propagated.
B. Travelling oscillations in the magnitude and direction of electric and mag-netic fields that do not require a material medium.
C. A periodic disturbance in some property of the medium, the medium itself remains (relatively) at rest.
D. A mechanism for the transfer of energy without the transfer of matter.
Which of the following sound levels, if prolonged, will damage the hearing mechanism of the ear without being perceived as painful?
A. 50 dB
B. 70 dB
C. 90 dB
D. 120 dB
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