Red light.
Blue light.
Green light.
Invisible.
Compressions and rarefactions of electromagnetic pulses.
Oscillating electric and magnetic fields.
Particles of light energy.
High-frequency gravitational waves.
Electromagnetic wave propagation.
Electromagnetic field induction.
Maxwell's laws.
Energy conservation.
None of these
Changes in atomic energy levels.
Vibrating atoms.
Accelerating electric charges.
Crystalline fluctuations.
None of these
Speed.
Wavelength.
Frequency.
All of these
Two of these
Radio waves
Infrared waves
X-rays
Ultraviolet waves
Light waves
Shorter.
Longer.
The same.
Less.
More.
The same.
Sound is emitted.
Light is emitted.
Electron excitation occurs.
A magnetic field is created
Its mass decreases.
Period of 1000 s.
Speed of 1000 m/s.
Wavelength of 1000 m.
Frequency of 1000 Hz.
Wavelength of 1000 km.
Sound waves
X-rays
Gamma rays
Light waves
Radio waves
Infrared part of the spectrum.
Visible part of the spectrum.
Ultraviolet part of the spectrum.
Are forced into vibration.
Resonate.
Pass the light energy along practically undiminished.
Freely absorb and re-emit most of the ultraviolet light.
Are forced into vibration.
Resonate.
Convert the light energy into internal energy.
Considerably less.
Slightly less.
The same.
Slightly more.
Considerably more.
More than its speed in a vacuum.
The same as its speed in a vacuum.
Less than its speed in a vacuum.
More.
Less.
The same.
Emanate from relatively hot sources.
Consist of frequencies lower than those of visible light.
Induce resonance in molecules and increase internal energy in a substance.
Are absorbed rather than reflected by the skin.
Are the predominant waves emitted by the sun.
Absorbed by them.
Reflected by them.
Transmitted by them.
All of these
None of these
Ultraviolet light.
Visible light.
Infrared light.
All of these
None of these
Infrared part of the spectrum.
Visible part of the spectrum.
Ultraviolet part of the spectrum.
Entire electromagnetic spectrum.
Sun passes into Earth's shadow.
Moon passes into Earth's shadow.
Earth passes into the sun's shadow.
Earth passes into the moon's shadow.
Sun passes into Earth's shadow.
Moon passes into the Earth's shadow.
The moon's shadow touches Earth.
Umbra.
Penumbra.
None of these
Earth disappear from the sky.
Earth dim and turn reddish.
Nothing unusual.
A tiny dark spot move across the face of Earth.
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