Science Flashcards
What is the speed of light in a vacuum?
Approximately 299,792 kilometers per second (km/s).
True or False: Sound can travel through a vacuum.
False.
Fill in the blank: The phenomenon of light bending when it passes from one medium to another is called __________.
refraction.
What is the unit of measurement for frequency?
Hertz (Hz).
Which type of wave is sound?
Longitudinal wave.
What is the visible spectrum range of light in nanometers?
Approximately 400 to 700 nanometers.
True or False: Light behaves both as a wave and a particle.
True.
What is the term for the lowest frequency of a sound wave that can be heard by the human ear?
Infrasound.
Fill in the blank: The __________ of a sound wave determines its pitch.
frequency.
What is the phenomenon where light waves spread out after passing through a narrow opening?
Diffraction.
What is the primary medium through which sound travels fastest?
Solids.
True or False: Ultraviolet light is visible to the human eye.
False.
What is the term for the amount of energy a sound wave carries?
Intensity.
What is the name of the effect where the frequency of a wave changes due to the motion of the source or observer?
Doppler effect.
Fill in the blank: The color perceived by the human eye is determined by the __________ of light.
wavelength.
What type of wave is light?
Electromagnetic wave.
What is the range of frequencies that humans can typically hear?
20 Hz to 20,000 Hz (20 kHz).
True or False: Sound waves require a medium to propagate.
True.
What is the term for the bouncing back of light when it hits a surface?
Reflection.
Fill in the blank: The __________ of light is responsible for the different colors observed in a prism.
dispersion.
What is the phenomenon called when sound waves reinforce each other?
Constructive interference.
What is the relationship between wavelength and frequency in waves?
They are inversely related; as wavelength increases, frequency decreases.
True or False: Infrared radiation has a longer wavelength than visible light.
True.
What is the term for the highest frequency of a sound wave that can be heard by the human ear?
Ultrasound.
Fill in the blank: The __________ determines how loud a sound is perceived.
amplitude.
What is the principle that states that light travels in straight lines unless acted upon by an external force?
The rectilinear propagation of light.
What is the term for the bending of light due to gravity?
Gravitational lensing.
True or False: The speed of sound is faster than the speed of light.
False.
What is the name of the unit that measures sound intensity?
Decibel (dB).
Fill in the blank: The __________ of a wave is the distance between consecutive crests or troughs.
wavelength.
What type of electromagnetic radiation has the shortest wavelength?
Gamma rays.
What is the term used to describe the range of electromagnetic waves, including light?
Electromagnetic spectrum.
True or False: Sound travels faster in air than in water.
False.
What is the term for the change in sound frequency perceived by an observer moving relative to the source of sound?
Doppler shift.
Fill in the blank: The __________ of a sound determines its timbre.
harmonics.
What phenomenon occurs when light passes through a prism?
Dispersion.
What is the primary factor that affects the speed of sound in a medium?
Temperature.
True or False: Visible light is a small part of the electromagnetic spectrum.
True.
What is the term for the measure of how much light is absorbed by a material?
Absorbance.
Fill in the blank: The __________ effect describes the change in frequency of a wave in relation to an observer moving relative to the wave source.
Doppler.
