If a Distant Object Emits Most of Their Electromagnetic Radiation at Smaller Wavelengths, What Can Astronomers Conclude?

Which of the following type of electromagnetic radiation has the most energy

• infrared

• ultraviolet

• microwaves

• radiowaves

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The Doppler effect applies to light waves as well as sound waves. Astronomers use this to measure the motion of stars and galaxies. In 1929, Edwin Hubble discovered that light from distant galaxies was shifted away from the blue end of the spectrum and towards the red end of the spectrum. Red light has a longer wavelength (and a lower frequency) than blue light. What could Hubble conclude about these galaxies?

• The distant galaxies are growing smaller.

• The distant galaxies are moving towards the Earth.

• The distant galaxies are moving away from earth

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Which type of light is just beyond red and is also considered "thermal" energy?

• Ultraviolet

• Infrared

• Microwave

• X-rays

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If an object like a star is moving away from Earth, the spectral lines are observed to be

• smaller or thinner & red-shifted.

• smaller or thinner & blue-shifted.

• wider or broader & blue-shifted.

• wider or broader & red-shifted.

Based on the picture, choose the best description of how wavelength and frequency are related

• As wavelength increases, frequency increases

• As frequency increases, wavelength decreases

• As frequency increases, wavelength remains the same

• Frequency and wavelength mean the same thing

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The energy that is radiated to Earth by the Sun includes visible light, infrared radiation, ultraviolet radiation, and other types. These different forms of radiation are distinguished based on what property?

• Amplitude

• Speed

• Intensity

• Wavelength

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The portion of the electromagnetic spectrum with a wavelength shorter than visible light and can cause sunburn is known as which of the following?

• Ultraviolet radiation

• Gamma radiation

• Infrared radiation

• Microwave radiation

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If a distant object emits most of its electromagnetic radiation at smaller wavelengths, what can astronomers conclude about its temperature?

• The object is cooler than objects emitting at longer wavelengths.

• The object is hotter than objects emitting at longer wavelengths.

• The object is moving away from the observer.

• The object is moving towards the observer.

What is the relationship between wavelength and frequency in electromagnetic radiation?

• They are directly proportional.

• They are inversely proportional.

• They are unrelated.

• They are equal.

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NGSS.HS-PS4-1

Which part of the electromagnetic spectrum has the shortest wavelength?

• Radio waves

• Infrared

• Ultraviolet

• Gamma rays

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