Astronomy Test 3

if a material is highly opaque then it

absorbs most light

when light reflects off an object, what is the relation between the angle of reflection

angle of incidence = angle of reflection

if a material is transparent, then it

transmits light well

grass looks green because it

reflect green light and absorbs other colors

the frequency of a wave is

all of the above

the wavelength of a wave is

the distance between 2 adjacent peaks of the wave

How are wavelength, frequency, and energy related for photons of light

longer wavelength means lower frequency and lower energy

light is considered as

radio, infrared, visible light, ultraviolet, X-rays, gamma rays

we can see each other in the classroom right now because we

reflect visible light

visible light from a distant star can be spread into a spectrum by using a glass prism or

a diffraction grating

suppose you know the frequency of a photon and the speed of light; what else can you determine about the photon

its wavelength and energy

when considering light as made up of individual “pieces”, the pieces are called

photons

which correctly orders the different categories of electromagnetic radiation from SHORTEST to longest

gamma rays, x-rays, ultraviolet, visible light, infrared, radio

which forms of light are lower in energy and frequency than the light that our eyes can see

infrared and radio

consider an atom of carbon in which the nucleus contains 6 protons and 7 neutrons. what is its atomic # and atomic mass #

atomic # = 6

atomic mass # = 13

an atom which has 4 protons and 6 neutrons will be electrically neutral if it contains

4 electrons

sublimation in the process in which

molecules go directly from the solid phase to the gas phase

thermal radiation is defined as

radiation with a spectrum whose shape depends only on the temperature of the emitting object

according to the laws of thermal radiation, hotter objects emit photons with

a shorter average wavelength

which planet has visible water ice on it

Mars

which planet has a ring system

all of the above

Suppose you view the solar system from high above Earth’s North Pole. Which of the following statements about planetary orbits will be true?

all the planets orbit counterclockwise around the sun

The terrestrial planets in our solar system are

Mercury, Venus, Earth, and Mars

the Jovian planets in our solar system are

Jupiter, Saturn, Uranus, and Neptune

The planet in our solar system with the highest average surface temperature is

Venus

Which Jovian planet does not have rings

they all have rings

which planet has been visited by the largest # of robotic spacecraft

Mars

Which planet has a horizontal spin axis

Uranus

A radio station at 93.3 FM broadcasts radio waves at a frequency of 93.3 MH2, what is their wavelength

3\.2m

what is the energy of the visible-light photon with a wavelength of 550nm

E = 3.6 x 10-19J

find the emitted power per square meter of the peak wavelength of the light intensity for a 15000 K object that emits thermal radiation

P = 2.9 x 109 Watts/m2