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physics week

name: ______________________________
Across
The effect created as a light source moves toward an observer and its light waves bunch up (decrease in wavelength) and appear more blue.
An observable event.
The physical phase (or state) in which a substance has no fixed shape or volume, and its particles are ionized (electrically charged).
The SI base unit of time.
In a vacuum, the speed of light is 300,000 km/s.
The form taken by electromagnetic energy as it travels through space. Electromagnetic waves consist of both electric and magnetic field components, which oscillate perpendicular to each other.
Refract irregularly in many directions. Different frequencies of light scatter at different angles.
The transfer of energy through the propagation of electromagnetic waves.
The range of frequencies possible for electromagnetic waves. Which includes radio and TV waves, light waves, gamma and X-rays, microwaves, and infrared waves.
Electromagnetic radiation with very high frequency and energy.
Symbols that represent unknown numbers or changeable quantities.
The effect created as a light source moves away from an observer and its light waves spread out (increase in wavelength) and appear more red.
Information about the physical world collected via the senses or a scientific instrument.
Down
A process in which lighter nuclei, such as those of hydrogen or lithium, merge to form heavier nuclei and release energy.
The ability to do work.
The reddening of distant light sources, such as galaxies, due to the overall expansion of the universe. The degree of reddening is proportional to the distance from Earth.
The magnitude of the distance an object travels per unit of time.
Waves that oscillate perpendicular to the direction of propagation.
The effect resulting when a source of waves is moving toward or away from an observer, resulting in a "bunching" (increase in frequency) of waves as it approaches, and a "spreading out" (decrease in frequency) of waves as it recedes
Empty space devoid of all matter.
The distance between the points at which a wave repeats itself.