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HOMEWORK #2
1. Which of the following statements is (are) correct?
(a) Hot lava emits a continuous spectrum.
(b) Achromatic doublets are used to correct spherical aberration.
2
3
(c) Newton's second law states that P = A
The correct answer(s) is(are) ___________.
2.
Which of the following is (are) correct?
(a) A radio photon has less energy than a visible light photon.
(b) Dispersion is the bending of light as it encounters an
obstacle.
(c) White is defined as as an equal amount of all wavelengths.
The correct answer(s) is(are) ____________.
3.
Which of the following is (are) correct?
(a) When light rays go into an optically less dense medium, they
bend away from the normal line.
(b) X-rays have shorter wavelengths than light waves.
(c) A prism can be used as a mirror.
The correct answer(s) is(are) ____________.
4.
Which of the following is (are) correct?
(a) For every electric wave there is a corresponding magnetic
wave at right angles to it.
(b) Blue light has a longer wavelength than yellow light.
(c) Light waves are longitudinal waves.
The correct answer(s) is(are) ____________.
5.
Which of the following is (are) correct?
(a) The Lyman series spectrum for hydrogen falls in the
infra red portion of the spectrum.
(b) The H-Beta absorption line is the result of an electron
jumping from the n=2 level to the n=4 level.
(c) Blue light is refracted more by a prism than red light?
The correct answer(s) is(are) ____________.
6.
Which of the following is (are) correct?
(a) If a light source approaches, the observer sees a redshift in
the light it emits.
(b) A spectral line is broadened as the pressure increases.
(c) Hot hydrogen ions emit the same spectra as those of hot
hydrogen atoms.
The correct answer(s) is(are) ____________.
7.
Which of the following is (are) correct for Jovian planets?
(a) They rotate more slowly than terrestrial planets.
(b) They are larger than terrestrial planets.
(c) They are denser than terrestrial planets.
The correct answer(s) is(are) ____________.
8.
Which of the following is (are) correct?
(a) The Earth's magnetosphere is encased by a shock layer called
the ionosphere.
(b) Weather on the Earth occurs in Troposphere.
(c) Aurorae on the Earth are caused by radio waves from Jupiter.
The correct answer(s) is(are) ____________.
9. Which of the following parameters is (are) important in determining
whether or not a particular element will remain in a planet's
atmosphere?
(a) temperature
(b) molecular (or atomic) weight
(c) escape velocity
The correct answer(s) is(are) ____________.
10.
Which of the following is (are) correct?
(a) Low energy photons have longer wavelengths than those with
high energy.
(b) High resolution radio telescopes are ordinarily
interferometers.
(c) Black bodies are poor emitters.
The correct answer(s) is(are) ____________.
11.
Which of the following is (are) correct?
(a) Reflecting telescopes are normally slower than refractors.
(b) Spherical aberration is a problem of refracting
telescopes.
(c) Arecibo is famous for its large radio telescope.
The correct answer(s) is(are) ____________.
12.
Which of the following is (are) common to all planets?
(a) Their orbital planes are near the ecliptic plane.
(b) They revolve eastward (counterclockwise) around the Sun.
(c) Their axes of rotation lie very near the ecliptic plane.
The correct answer(s) is(are) ____________.
13. A 5500 Angstrom source approaches me. I observe a wavelength of
of 5000 Angstroms. How fast is the source moving?
(HINT: c is the speed of light)
The correct answer(s) is(are) ____________.
14.
Which of the following is (are) correct for spectra?
(a) Emission lines occur when atomic electrons go to higher
states.
(b) In the diffraction pattern of an aperture the Airy disk
gets smaller when the aperture gets larger.
(c) Lyman series photons are more energetic than those in the
Balmer series.
The correct answer(s) is(are) ____________.
15.
Which of the following is (are) correct?
(a) If the temperature of a black body is tripled, the total
radiated power per unit area (the flux) will increase
by a factor of nine.
(b) Aurorae on the Earth occur only at the North Pole.
(c) Near the Earth's geographic north pole is found the Earth's
magnetic south pole.
The correct answer(s) is(are) ____________.
16.
Which of the following is (are) correct?
(a) Light enters a telescope as parallel light rays.
(b) Mars is a Terrestrial planet.
(c) Currents in the Earth's oceans are thought to be the cause of
the Earth's magnetic field.
The correct answer(s) is(are) ____________.
17.
Which of the following is (are) correct?
(a) The Earth's crust is less dense than its mantle.
(b) The Rayleigh criterion is used in calculating the
magnifying power of a telescope.
(c) Dish-type radio telescopes ordinarily have higher resolution
than optical telescopes.
The correct answer(s) is(are) ____________.
18.
Which of the following is (are) correct?
(a) A famous optical telescope is located on Mt. Palomar.
(b) The Hubble Space Telescope uses a cassagrain focusing
configuration.
(c) Radio telescopes use grazing incidence mirrors.
The correct answer(s) is(are) ____________.
19.
Which of the following is (are) correct for the eye?
(a) When relaxed it focuses on distant objects.
(b) Adaptation is accomplished primarily by dilation of
the pupil.
(c) Images on the retina are inverted.
The correct answer(s) is(are) ____________.
20.
Which of the following is (are) correct?
(a) Neptune was discovered by Herschel.
(b) Pluto is a Jovian planet.
(c) Neptune's moon Triton revolves in the retrograde
sense.
The correct answer(s) is(are) ____________.
21.
Which of the following is (are) correct for Jupiter?
(a) Its equatorial clouds rotate with about the same
period as those near the poles.
(b) Its moon Io has many volcanos.
(c) The Great Red Spot is the top of a really large
mountain.
The correct answer(s) is(are) ____________.
22.
Which of the following is (are) correct?
(a) Jupiter's moon Europa causes a large torus (doughnut
shaped) cloud of material to surround the planet.
(b) Uranus rotates in the retrograde sense.
(c) Saturn's moon Titan is a shepherding moon.
The correct answer(s) is(are) ____________.
23.
Which of the following is (are) correct?
(a) Uranus is thought to have a solid core.
(b) The Kuiper belt lies between Mars and Jupiter.
(c) Mars' polar caps contain carbon dioxide (dry) ice.
The correct answer(s) is(are) ____________.
24.
Which of the following is (are) correct?
(a) Pluto keeps the same face toward its moon Charon.
(b) Juno is the largest asteroid.
(c) Titan has hydrocarbon oceans.
The correct answer(s) is(are) ____________.
25.
Which of the following is (are) correct?
(a) Saturn's moon Mimas is responsible for the Cassini
division.
(b) Phobos is a moon of Mars.
(c) The basic reaction in the Sun's core is chemical
combustion.
The correct answer(s) is(are) ____________.
26.
Which of the following is (are) correct?
(a) The dust tails of comets are generally curved.
(b) The nucleus of a comet is a few miles across.
(c) Comets are rocky in composition.
The correct answer(s) is(are) ____________.
27.
Which of the following is (are) correct?
(a) Meteor showers occur when the Earth passes through the
asteroid belt.
(b) Iron meteorites are the most common.
(c) The point from which shower meteors appear to
originate is called the "radiant".
The correct answer(s) is(are) ____________.
28.
Which of the following is (are) correct?
(a) Meteoroids are really small comets.
(b) A "meteorite" is the remnant of a meteor after it hits
the ground.
(c) A typical shower meteor weighs about one ton.
The correct answer(s) is(are) ____________.
29.
Which of the following is (are) correct?
(a) Neptune's moon triton is its largest moon.
(b) Saturn's rings are composed of large chunks of ice.
(c) A scarp on Mercury is really a crater.
The correct answer(s) is(are) ____________.
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