Exam 3: Light and Telescopes

An electron is in the n = 3 energy level in a hydrogen atom.To ionize this atom,it is necessary for the electron to gain a minimum of how much energy? (See Figure 3-51,Comins,Discovering the Essential Universe,6th ed.)

The MAIN use of the Schmidt-type telescope,which uses a spherical primary mirror and a refracting "corrector plate," is for:

Where and by what technique was the element helium first discovered?

How does the resolution of a typical radio telescope compare with the resolution of a typical optical telescope?

The average temperature of Mars is less than that of Earth.What would be the relative wavelengths of the peak emissions of the spectra from these planets?

The mass of the proton,the nucleus of the hydrogen atom,exceeds the mass of the electron by approximately what factor?

When white light passes through a prism,a spectrum is formed.This is because the prism:

Who first showed that light does NOT travel at infinite speed?

The force that holds the atomic nucleus together is:

The Balmer series of hydrogen has a series limit (at 364.6 nm)(see Figure 3.51,Comins,Discovering the Essential Universe,6th ed.)because hydrogen in the n = 2 state:

Newton's prism experiment showed that,when a beam of white light passes through a prism,the prism:

In the 1860s,Maxwell derived a set of mathematical equations that described electromagnetic waves that could have different wavelengths.These waves,which include visible light,have since been shown to:

We plot the intensity of the radiation emitted from an object at a certain temperature versus its wavelength.As we increase the temperature,the wavelength at which the spectrum peaks becomes shorter and shorter.This is an example of:

A beam of light of which of the following pure colors is made up of photons of the lowest energy?

The amount of radiation emitted by a blackbody depends on all of the following properties of the blackbody EXCEPT ONE.Which is the exception?

In 1801,Thomas Young performed a crucial experiment on the nature of light when he:

When a rod of metal is heated intensely,its predominant color will:

The detector that in many instances has replaced the photographic plate for astronomical photography is the:

What overall effect on the visible spectrum of the light from a star results from the light's passage through Earth's atmosphere?

The first astronomical radio source was detected and identified in the year: