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Astronomy

Test 1 (part 3)

QuestionAnswer
A wave's velocity is the product of the frequency times the wavelength of the wave
The number of waves passing the observer per second is The frequency in hertz
Which of these is constant for ALL types of electromagnetic radiation in a vacuum? Velocity
Electromagnetic radiation Can behave both as a wave and as a particle
The temperature scale that places zero at the point where all atomic and molecular motion ceases is Kelvin
Which form of electromagnetic radiation is absorbed by carbon dioxide and water vapor in our atmosphere? Infrared
Which form of electromagnetic radiation would be blocked in the stratosphere by ozone? Ultraviolet
Of all the forms of electromagnetic radiation the one with the lowest frequency is Radio waves
The Earth's ionosphere partially blocks which form of electromagnetic radiation? Radio
The two forms of electromagnetic radiation that penetrate the atmosphere best are: Visible and radio waves
X-ray telescopes are located in orbit around the Earth because: X-rays don't reach the surface of the Earth
Electromagnetic radiation with a wavelength of 700nm would be: Red light
The visible color of electromagnetic radiation that has the shortest wavelength is: Violet
Colors appear different to us because of their photons' different frequencies.
There are no X-ray telescopes on Earth because X-rays don't penetrate Earth's atmosphere
There are no radio telescopes in space because Radio waves penetrate earths atmosphere so there's no need to put one in space
The radiation our eyes are most sensitive to lies in the color: Yellow-green at about 550nm
What is true of a blackbody? Its energy peaks at he wavelength determined by its temperature
According to Wein's Law, if the surface temperature is increased by a factor of 2, its peak wavelength will decrease by a factor of 2
Star A has a temperature 1/2 that of star B, but star A is 5 times bigger than star B, which implies star A is redder and brighter than star B
Star A and Star B have same temperatures, but Star A is more luminous than Star B. Based on this information, which of the following must be the case? Star A must be bigger.
At which of these Kelvin temperatures would a blackbody radiate mostly at visible wavelengths? 6000 K
The wavelength at which a blackbody radiates most depends on its temperature.
Stars like our Sun emit most of their light in which part of the electromagnetic spectrum? Visible
To see the Sun's hot corona (a temperature of 1,000,000 K), which part of the electromagnetic spectrum should one observe? the x-ray
Increasing the temperature of a blackbody by a factor of 3 will increase its energy by a factor of 81
Radio waves, visible light, and X-rays are all a type of electromagnetic radiation. True
You would perceive a change in a visible light wave's amplitude as a change in its color. False
Gamma Rays are a type of electromagnetic radiation. True
If a new wave arrives on shore every two seconds, then its frequency is 2 Hz. False
Changing the electric field will have no effect on the magnetic fields of a body. False
As they move through space, the vibrating electrical and magnetic fields of a light wave must move perpendicular to each other. True
X-rays travel at a greater speed than radio waves. False
Wave energy can only be transmitted through a material medium. False
Observations in the X-ray portion of the spectrum are routinely done from the surface of the earth. False
A blue star has a higher surface temperature than a red star. True
Doubling the temperature of a black body will double the total energy it radiates False
As a star's temperature increases, the frequency of peak emission also increases. True
Created by: graync
 

 



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