Question 1

The focal ratio of a lens or mirror is the ratio of its

Accepted Answer

A) Focal length to diameter 
B) Diameter to thickness 
C) Magnification to diameter 
D) Focal length to thickness 
A) Focal length to diameter 
B) Diameter to thickness 
C) Magnification to diameter 
D) Focal length to thickness

Question 2

Why do X-ray telescopes have to be placed in space satellites?

Accepted Answer

A) They are too sensitive to terrestrial radiation 
B) They are too dangerous for astronomers to operate on the ground 
C) The Earth's atmosphere absorbs cosmic X-rays 
D) There is too much scattered sunlight in the Earth's atmosphere 
E) The mirrors for X-ray telescopes are too large to operate on the ground 
A) They are too sensitive to terrestrial radiation 
B) They are too dangerous for astronomers to operate on the ground 
C) The Earth's atmosphere absorbs cosmic X-rays 
D) There is too much scattered sunlight in the Earth's atmosphere 
E) The mirrors for X-ray telescopes are too large to operate on the ground

Question 3

In the laboratory,an atom emits a spectral line at a wavelength of 400 nanometers.In the spectrum of a star,the same spectral line is found to have a wavelength of 410 nanometers.What can be said about the star?

Accepted Answer

A) It is hotter than the Sun 
B) It is moving toward the Earth 
C) It is moving away from the Earth 
D) It contains elements that are not found on Earth 
A) It is hotter than the Sun 
B) It is moving toward the Earth 
C) It is moving away from the Earth 
D) It contains elements that are not found on Earth

Question 4

The same telescope is used to obtain an image using light of the following wavelengths.Which of the images will have the poorest angular resolution?

Accepted Answer

A) Blue 
B) Yellow 
C) Red 
D) Infrared 
A) Blue 
B) Yellow 
C) Red 
D) Infrared

Question 5

Which of the following is not likely to be an attribute of a good observing site?

Accepted Answer

A) Dark sky 
B) Atmospheric stability 
C) Low elevation 
D) Low humidity 
A) Dark sky 
B) Atmospheric stability 
C) Low elevation 
D) Low humidity

Question 6

The wavelength of a wave is 2 meters.The frequency of the wave is 2 Hz.What is the speed of the wave?

Accepted Answer

A) 16 m/s 
B) 4 m/s 
C) 64 m/s 
D) 0.25 m/s 
A) 16 m/s 
B) 4 m/s 
C) 64 m/s 
D) 0.25 m/s

Question 7

The magnification in a refracting telescope is calculated in what way?

Accepted Answer

A) Compute the ratio of the focal length of the eyepiece lens to the focal length of the objective lens 
B) Compute the ratio of the focal length of the objective lens to the focal length of the eyepiece lens 
C) Multiply 1.22 by the diameter of the appeture lens 
D) Compute the square of the length of the telescope 
A) Compute the ratio of the focal length of the eyepiece lens to the focal length of the objective lens 
B) Compute the ratio of the focal length of the objective lens to the focal length of the eyepiece lens 
C) Multiply 1.22 by the diameter of the appeture lens 
D) Compute the square of the length of the telescope

Question 8

The product of the wavelength and frequency of a wave is equal to

Accepted Answer

A) The speed of the wave 
B) The energy of the wave 
C) The distance between crests of the wave 
D) The temperature of the wave 
A) The speed of the wave 
B) The energy of the wave 
C) The distance between crests of the wave 
D) The temperature of the wave

The focal ratio of a lens or mirror is the ratio of its

Why do X-ray telescopes have to be placed in space satellites?

In the laboratory,an atom emits a spectral line at a wavelength of 400 nanometers.In the spectrum of a star,the same spectral line is found to have a wavelength of 410 nanometers.What can be said about the star?

The same telescope is used to obtain an image using light of the following wavelengths.Which of the images will have the poorest angular resolution?

Which of the following is not likely to be an attribute of a good observing site?

The wavelength of a wave is 2 meters.The frequency of the wave is 2 Hz.What is the speed of the wave?

The magnification in a refracting telescope is calculated in what way?

The product of the wavelength and frequency of a wave is equal to

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Overview of the Solar System

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Satellites

Small Solar System Bodies

Basic Properties of Stars

The Sun

The Formation of Stars and Planets

The Evolution of Stars

White Dwarfs, neutron Stars, and Black Holes

Binary Star Systems

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Exam 6: Light and Telescopes

The focal ratio of a lens or mirror is the ratio of its

Why do X-ray telescopes have to be placed in space satellites?

In the laboratory,an atom emits a spectral line at a wavelength of 400 nanometers.In the spectrum of a star,the same spectral line is found to have a wavelength of 410 nanometers.What can be said about the star?

The same telescope is used to obtain an image using light of the following wavelengths.Which of the images will have the poorest angular resolution?

Which of the following is not likely to be an attribute of a good observing site?

The wavelength of a wave is 2 meters.The frequency of the wave is 2 Hz.What is the speed of the wave?

The magnification in a refracting telescope is calculated in what way?

The product of the wavelength and frequency of a wave is equal to

Journeys Start

Patterns in the Sky

Ancient Astronomy

Renaissance Astronomy

Gravity and Motion

Overview of the Solar System

The Earth

The Moon

Mercury and Venus

Mars

Jupiter and Saturn

The Outer Solar System

Satellites

Small Solar System Bodies

Basic Properties of Stars

The Sun

The Formation of Stars and Planets

The Evolution of Stars

White Dwarfs, neutron Stars, and Black Holes

Binary Star Systems

The Milky Way

Galaxies

Quasars and Other Active Galaxies

Galaxy Clusters and the Structure of the Universe

Cosmology

Life in the Universe

Filters