Chapter 5 Flashcards
Which formula denotes how the speed of light is related to its wavelength and frequency?
c = λf
Which of the following photons carries the smallest amount of energy?
a microwave photon, whose wavelength is 10–2 m
If the frequency of a beam of light were to increase, its period would ________, and its wavelength would ________.
decrease; decrease
Which of these objects would emit an absorption spectrum?
a thin, cool gas cloud that lies in front of a hotter blackbody
If you observe the spectrum of a single star located in otherwise empty space, you will see
a continuous spectrum with absorption lines.
the electron is excited to the E4 energy level. If the electron transitions to a new energy level giving off a photon, which level would produce a photon with the largest frequency?
E1
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 wavelength?
E3
A spaceship is traveling toward Earth while giving off a constant radio signal with a wavelength of 1 m. What will the signal look like to people on Earth?
a signal with a wavelength of less than 1 m
Which of these stars would have the largest positive redshift?
a star moving at high speed away from you
You observe the spectrum of two stars. Star A has an emission line from a known element at 600 nm. Star B has emission lines from the same atom, but the emission line occurs at 650 nm. One possible explanation for this observation is that star B is
moving away from us faster than star A.
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?
Star A is four times as luminous as star B.
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 in Earth’s sky?
Star D appears four times as bright as star C.
Which of these planets would be expected to have the highest average temperature?
a dark-colored planet close to its star
Wavelengths from longest to shortest
radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
