# Astronomy

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Electromagnetic Spectrum, Chpt 3 (J)

Of all the forms of electromagnetic radiation, the one with the lowest frequency is

### True

Radio waves, visible light, and x-rays are all a type of electromagnetic radiation

### visible

Which type of radiation can be observed well from Earth's surface?

### velocity

Which of these is constant for ALL types of electromagnetic radiation in a vacuum?

### frequency times the wavelength of the wave

A wave's velocity is the product of the

### x-rays don't reach the surface of Earth

X-ray telescopes are located in orbit around the Earth because

### ultraviolet

Which form of electromagnetic radiation would be blocked in the stratosphere by ozone?

### True

An observer will measure the wavelength of waves eminating from a source that is moving away as longer than it really is.

Can behave both as a wave and as a particle.

The Doppler Effect is a phenomenon that allows one to measure an object's

### bluer than it is

If a light source is approaching you at a speed very close to the speed of light, it will appear

### no shift

The light from an object moving tangentially (to your left or right) will exhibit

### Its energy peaks at the wavelength determined by its temperature

What is true of a blackbody?

### Stefan's Law

If the Sun's temperature were doubled, it would give off 16x's more energy.

### Star B must be bigger

Star A and Star B have the same temperature, but star B is more luminous than star A. What can you infer about these two stars?

### True

As they move thru space, the vibrating electrical and magnetic fields of a light wave must move perpendicular to each other.

### the frequency in Hertz

The number of waves passing the observer per second is

### the wave nature of light

What does the phenomenon of interference demonstrate?

### violet

The visible color of electromagnetic radiation that has the shortest wavelength is

### transfer energy

Both sound waves and electromagnetic radiation

### False

Observations in the x-ray portion of the spectrum are routinely done from the surface of the earth.

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