Abeka 9th Science Quiz 13

The principle stating that the angle of incidence equals the angle of reflection is the ________.

• theory of absorption
• principle of diffraction
• law of refraction
• law of reflection

The SI unit of frequency is the __________.

• hertz
• decibel
• joule
• watt

The substance through which a wave transfers its energy is the __________.

• amplitude

• vibration
• medium

• frequency

The number of waves that pass a given point per unit time is ____________.

• amplitude
• wavelength
• speed
• frequency

_________ is the spreading out of a wave after it passes through a narrow opening.

• Reflection
• Diffraction
• Absorption
• Refraction

The reinforcement or cancellation that occurs when two or more waves meet is called __________.

• interference
• reflection
• refraction
• diffraction

The bending of the path of a wave as a result of a change in wave speed is _________.

• reflection
• diffraction
• refraction
• absorption

The maximum distance that particles are displaced by a wave is ___________.

• wavelength
• frequency
• period
• amplitude

What is the speed of a wave with a wavelength of 3.0m and a frequency of 4.0 Hz?

• 10.0 m/s
• 15.0 m/s
• 8.0 m/s
• 12.0 m/s

Which formula is used to find the period of a wave?

• T = t/N

• f = Nt

• T = 2πf
• v = sd