UNIT 1

"When the temperature of an object increases, the total power it radiates per square meter (it's energy flux) increases very rapidly (it grows exponentially)". This statement best describes...

According to Wein's law, the higher the surface temperature of a star, the shorter the wavelength of its peak emitted EM radiation will be.

Consider the following scenario: You are sitting on an anchored (stationary) fishing boat on a windy day. Watching the waves you notice they appear identical. You count 6 wave crests pass your anchor rope in exactly 24 seconds. What is the period of the waves?

Let's say that a particular emission line of helium is originally emitted with an original wavelength of 505.5 nm from a star traveling quickly across our galaxy. Using a research telescope with an attached spectrometer, we observe and measure the wavelength of this emission line coming from the star to be 506.1 nm. Based on these numbers, how fast is this star moving toward or away from us here on Earth? (see example of this type of question in lecture slides or in textbook)

Suppose you see two stars: a blue star and a red star. Which of the following can you conclude about the two stars? Assume that no Doppler shifts are involved. (Hint: Look in the lecture slides (Part 2): Radiation Laws for a good explanation.)

When astronomers take the visible light coming from the Sun and spread it out using a prism or spectral grating, the observed spectrum is

The larger the blue shift of a galaxy's overall spectrum, the faster the distant galaxy is rushing toward us.

The number of waves that pass a point each second measures

The spectral lines of each element are distinctive to that element, whether we are looking at emission or absorption lines.

Visible light is a type of electromagnetic wave that has been known to us since the beginning of human times. Who was the first person to discover another type of invisible energy wave what would later become known as another type of electromagnetic radiation?

Which of the following is NOT one of Kirchoff's laws?

Consider this diagram. Which statement is true?

Different photons of visible light can contain different quantities of energy, depending on their frequency (colour).

If a wave's wavelength is shortened by half and yet its speed is kept constant, the wave's frequency

In Bohr's model of the atom, electrons

In the vacuum of space, one of the following properties is the same for all types of electromagnetic waves. Which is it?

In trying to visualize the size of specific forms of electromagnetic waves, it can be said that infrared waves have wavelengths comparable in size to a(n)...

Of all the forms of electromagnetic waves that attempt to penetrate earth's atmosphere, the two forms that experience the least atmospheric opacity (pass through to the surface most effectively) are:

Regarding electromagnetic radiation, what was William Wollaston's most important contribution?

Rutherford's experiment with alpha particle scattering by gold foil established that...

Scientists point to observations of the phenomena of diffraction and interference to support the idea that...

The range of wavelengths of electromagnetic radiation that the human eye is able to detect is from about _________ to about _________.

What is the name of the temperature scale that places zero at the point where all atomic and molecular motion ceases?

Which of the following is true for any object that can be thought of as a "blackbody"?

Which of the following places the types of electromagnetic waves listed in the correct order from shortest wavelength -->to--> longest wavelength?