EM Waves & Photons

Electromagnetic waves vary in

• the speed they travel in a vacuum.

• wavelength and frequency.

• the way they reflect.

• the orientation of their electric and magnetic fields.

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Light acts like

• a wave.

• a particle.

• Both a wave and a particle

• neither a wave nor a particle.

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Newton’s prism experiments showed that white sunlight is made up of

• the full electromagnetic spectrum.

• only blue light.

• all the colors of the visible spectrum.

• only the longest wavelengths.

When the absorption lines of a galaxy shift toward the blue end of the spectrum, it means that the galaxy is

• moving away from Earth

• small and young

• moving closer to Earth

• large and old

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The photoelectric effect is when:

• Electrons collide inside a metal to release photons.
• One incident metal electron releases one photon.
• One incident photon releases one electron from a metal.
• Photons are absorbed in to metal ions releasing electrons.

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How does light travel? 

• in all directions
• in transverse waves
• in a zig zag line
• back and forth

An argon ion laser emits light at 488 nm. What is the frequency of this radiation?

• 4.07 x 10^-19 Hz
• 6.14 x 10^14 Hz
• 1.46 x 10^2 Hz
• 2.05 x 10^ 6 Hz

The ________ of a photon of light is ________ proportional to it frequency and ________ proportional to its wavelength.

• amplitude, directly, inversely
• energy, inversely, directly
• energy, directly, inversely
• velocity, inversely, directly

Tags

NGSS.HS-PS4-1

A common infrared laser operates at 1.06 x 10³ nm. What if the energy of a photon with this wavelength?

• 7.02 x 10^-40 J
• 6.25 x 10^-28 J
• 3.54 x 10^-15 J
• 1.87 x 10^-19 J

As an electron moves from n=1 to n=4, is energy absorbed or released?

• Absorbed
• Released