Exam 5: Light

In the energy level diagram shown in the figure below, the electron is excited to the E₄ energy level.If the electron transitions to an energy level giving off a photon, which level would produce a photon with the largest energy?

Sketch two blackbody curves, one for a hot blue object and the second for a cooler red object.Be sure to label your axes.

You record the spectrum of a star and find that a calcium absorption line has an observed wavelength of 394.0 nm.This calcium absorption line has a rest wavelength of 393.3 nm.What is the approximate radial velocity of this star?

Star C and star D have the same luminosity.Star C is twice as far away from Earth as star D.How do the brightness levels of stars C and D compare?

If the quantity of something entering a system is equal to the quantity of that same thing leaving that system, we say the system is

In the figure below, which blackbody spectrum corresponds to the object that would appear white to the human eye?

If you observe the spectrum of an isolated hot cloud of gas, you will see

Star A and star B appear equally bright in the sky.Star A is twice as far away from Earth as star B.How do the luminosities of stars A and B compare?

Name four physical properties of an object that we can determine by analyzing the radiation that it emits, and briefly describe how these properties are determined.Cite the names of any laws that apply.

A spaceship is traveling toward Earth while giving off a constant radio signal with a wavelength of 1 meter (m).What will the signal look like to people on Earth?

You are driving on the freeway when a police officer records a shift of -7 nm when he or she measures your speed with a radar gun that operates at a wavelength of 0.1 m.How fast were you going?

What is the difference between visible light and X-rays?

When talking about a wave, what does the term medium refer to?

How can the average temperature of Earth stay approximately constant even though Earth is always getting energy from the Sun?

You observe a red star and a blue star and are able to determine that they are the same size.Which star has a higher surface temperature, and which star is more luminous?

What two factors control the surface temperature of a planet in our Solar system, if it has no atmosphere and no internal source of heat?

If the Sun's luminosity were twice its actual value, Earth's temperature would

The figure below illustrates a stellar spectrum.The dip in the data near 650 nm corresponds most closely with which of the following?

The Doppler shift can be used to determine the ________ of an object.

How is the energy of a photon related to its frequency, wavelength, and speed?