COLLEGE PHYSICS
13th Edition
ISBN: 2810014673880
Author: OpenStax
Publisher: OpenStax
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Textbook Question
Chapter 27, Problem 62PE
The limit to the eye's acuity is actually related to diffraction by the pupil.
(a) What is the angle between two just-resolvable points of light for a 3.00-mm-diameter pupil, assuming an average wavelength of 550 nm?
(b) Take your result to be the practical limit for the eye. What is the greatest possible distance a car can be from you if you can resolve its two headlights, given they are 1.30 m apart?
(c) What is the distance between two just-resolvable points held at an arm's length (0.800 m) from your eye?
(d) How does your answer to (c) compare to details you normally observe in everyday circumstances?
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Question 04
in 20
Question B3
Consider the following FLRW spacetime:
t2
ds² = -dt² +
(dx²
+ dy²+ dz²),
t2
where t is a constant.
a)
State whether this universe is spatially open, closed or flat.
[2 marks]
b) Determine the Hubble factor H(t), and represent it in a (roughly drawn) plot as a function
of time t, starting at t = 0.
[3 marks]
c) Taking galaxy A to be located at (x, y, z) = (0,0,0), determine the proper distance to galaxy
B located at (x, y, z) = (L, 0, 0). Determine the recessional velocity of galaxy B with respect
to galaxy A.
d) The Friedmann equations are
2
k
8πG
а
4πG
+
a²
(p+3p).
3
a
3
[5 marks]
Use these equations to determine the energy density p(t) and the pressure p(t) for the
FLRW spacetime specified at the top of the page.
[5 marks]
e) Given the result of question B3.d, state whether the FLRW universe in question is (i)
radiation-dominated, (ii) matter-dominated, (iii) cosmological-constant-dominated, or (iv)
none of the previous. Justify your answer.
f)
[5 marks]
A conformally…
SECTION B
Answer ONLY TWO questions in Section B
[Expect to use one single-sided A4 page for each Section-B sub question.]
Question B1
Consider the line element
where w is a constant.
ds²=-dt²+e2wt dx²,
a) Determine the components of the metric and of the inverse metric.
[2 marks]
b) Determine the Christoffel symbols. [See the Appendix of this document.]
[10 marks]
c)
Write down the geodesic equations.
[5 marks]
d) Show that e2wt it is a constant of geodesic motion.
[4 marks]
e)
Solve the geodesic equations for null geodesics.
[4 marks]
Chapter 27 Solutions
COLLEGE PHYSICS
Ch. 27 - What type of experimental evidence indicates that...Ch. 27 - Give an example of a wave characteristic of light...Ch. 27 - How do wave effects depend on the size of the...Ch. 27 - Under what conditions can light be modeled like a...Ch. 27 - Go outside in the sunlight and observe your...Ch. 27 - Why does the wavelength of light decrease when it...Ch. 27 - Does Huygens's principle apply to all types of...Ch. 27 - Young's double slit experiment breaks a single...Ch. 27 - Suppose you use the same double slit to perform...Ch. 27 - Is it possible to create a situation in which...
Ch. 27 - Figure 27.55 shows the central part of the...Ch. 27 - What is the advantage of a diffraction grating...Ch. 27 - What are the advantages of a diffraction grating...Ch. 27 - Can the lines in a diffraction grating be too...Ch. 27 - If a beam of white light passes through a...Ch. 27 - Suppose pure-wavelength light falls on a...Ch. 27 - Suppose a feather appears green but has no green...Ch. 27 - It is possible that there is no minimum in the...Ch. 27 - As the width of the slit producing a single-slit...Ch. 27 - A beam of light always spreads out. Why can a beam...Ch. 27 - What effect does increasing the wedge angle have...Ch. 27 - How is the difference in paths taken by two...Ch. 27 - Is there a phase change in the light reflected...Ch. 27 - In placing a sample on a microscope slide, a glass...Ch. 27 - Answer the above question if the fluid between the...Ch. 27 - While contemplating the food value of a slice of...Ch. 27 - An inventor notices that a soap bubble is dark at...Ch. 27 - A non-reflective coating like the one described in...Ch. 27 - Why is it much more difficult to see interference...Ch. 27 - Under what circumstances is the phase of light...Ch. 27 - Can a sound wave in air be polarized? Explain.Ch. 27 - No light passes through two perfect polarizing...Ch. 27 - Explain what happens to the energy carried by...Ch. 27 - When particles scattering light are smaller than...Ch. 27 - Using the information given in the preceding...Ch. 27 - When light is reflected at Brewster's angle from a...Ch. 27 - Explain how microscopes can use wave optics to...Ch. 27 - A bright white light under water is collimated and...Ch. 27 - Show that when light passes from air to water, its...Ch. 27 - Find the range of visible wavelengths of light in...Ch. 27 - What is the index of refraction of a material for...Ch. 27 - Analysis of an interference effect in a clear...Ch. 27 - What is the ratio of thicknesses of crown glass...Ch. 27 - At what angle is the first-order maximum for...Ch. 27 - Calculate the angle for the third-order maximum of...Ch. 27 - What is the separation between two slits for which...Ch. 27 - Find the distance between two slits that produces...Ch. 27 - Calculate the wavelength of light that has its...Ch. 27 - What is the wavelength of light falling on double...Ch. 27 - At what angle is the fourth-order maximum for the...Ch. 27 - What is the highest-order maximum for 400-nm light...Ch. 27 - Find the largest wavelength of light falling on...Ch. 27 - What is the smallest separation between two slits...Ch. 27 - (a) What is the smallest separation between two...Ch. 27 - (a) If the first-order maximum for pure-wavelength...Ch. 27 - Figure 27.56 shows a double slit located a...Ch. 27 - Using the result of the problem above, calculate...Ch. 27 - Using the result of the problem two problems...Ch. 27 - A diffraction grating has 2000 lines per...Ch. 27 - Find the angle for the third-order maximum for...Ch. 27 - How many lines per centimeter are there on a...Ch. 27 - What is the distance between lines on a...Ch. 27 - Calculate the wavelength of light that has its...Ch. 27 - An electric current through hydrogen gas produces...Ch. 27 - (a) What do the four angles in the above problem...Ch. 27 - What is the maximum number of lines per centimeter...Ch. 27 - The yellow light from a sodium vapor lamp seems to...Ch. 27 - What is the spacing between structures in a...Ch. 27 - Structures on a bird feather act like a reflection...Ch. 27 - An opal such as that shown in Figure 27.17 acts...Ch. 27 - At what angle does a diffraction grating produces...Ch. 27 - Show that a diffraction grating cannot produce a...Ch. 27 - If a diffraction grating produces a first-order...Ch. 27 - (a) Find the maximum number of lines per...Ch. 27 - €37. (a) Show that a 30,000-line-per-centimeter...Ch. 27 - A He—Ne laser beam is reflected from the surface...Ch. 27 - The analysis shown in the figure below also...Ch. 27 - Unreasonable Results Red light of wavelength of...Ch. 27 - Unreasonable Results (a) What visible wavelength...Ch. 27 - Construct Your Own Problem Consider a spectrometer...Ch. 27 - (a) At what angle is the first minimum for 550-nm...Ch. 27 - (a) Calculate the angle at which a 2.00- m -wide...Ch. 27 - (a) How wide is a single slit that produces its...Ch. 27 - (a) What is the width of a single slit that...Ch. 27 - Find the wavelength of light that has its third...Ch. 27 - Calculate the wavelength of light that produces...Ch. 27 - (a) Sodium vapor light averaging 589 nm in...Ch. 27 - (a) Find the angle of the third diffraction...Ch. 27 - (a) Find the angle between the first minima for...Ch. 27 - (a) What is the minimum width of a single slit (in...Ch. 27 - (a) If a single slit produces a first minimum at...Ch. 27 - A double slit produces a diffraction pattern that...Ch. 27 - Integrated Concepts A water break at the entrance...Ch. 27 - Integrated Concepts An aircraft maintenance...Ch. 27 - The 300-m-diameter Arecibo radio telescope...Ch. 27 - Assuming the angular resolution found for the...Ch. 27 - Diffraction spreading for a flashlight is...Ch. 27 - (a) What is the minimum angular spread of a 633-nm...Ch. 27 - A telescope can be used to enlarge the diameter of...Ch. 27 - The limit to the eye's acuity is actually related...Ch. 27 - What is the minimum diameter mirror on a telescope...Ch. 27 - You are told not to shoot until you see the whites...Ch. 27 - (a) The planet Pluto and its Moon Charon are...Ch. 27 - The headlights of a car are 1.3 m apart. What is...Ch. 27 - When dots are placed on a page from a laser...Ch. 27 - Unreasonable Results An amateur astronomer wants...Ch. 27 - Construct Your Own Problem Consider diffraction...Ch. 27 - A soap bubble is 100 nm thick and illuminated by...Ch. 27 - An oil slick on water is 120 nm thick and...Ch. 27 - Calculate the minimum thickness of an oil slick on...Ch. 27 - Find the minimum thickness of a soap bubble that...Ch. 27 - A film of soapy water (n=1.33) on top of a plastic...Ch. 27 - What are the three smallest non-zero thicknesses...Ch. 27 - Suppose you have a lens system that is to be used...Ch. 27 - (a) As a soap bubble thins it becomes dark,...Ch. 27 - A film of oil on water will appear dark when it is...Ch. 27 - Figure 27.34 shows two glass slides illuminated by...Ch. 27 - Figure 27.34 shows two 7.50-cm-long glass slides...Ch. 27 - Repeat Exercise 27.70, but take the light to be...Ch. 27 - Repeat Exercise 27.71, but take the light to be...Ch. 27 - Unreasonable Results To save money on making...Ch. 27 - What angle is needed between the direction of...Ch. 27 - The angle between the axes of two polarizing...Ch. 27 - If you have completely polarized light of...Ch. 27 - What angle would the axis of a polarizing filter...Ch. 27 - At the end of Example 27.8, it was stated that the...Ch. 27 - Show that if you have three polarizing filters,...Ch. 27 - Prove that, if I is the intensity of light...Ch. 27 - At what angle will light reflected from diamond be...Ch. 27 - What is Brewster's angle for light traveling in...Ch. 27 - A scuba diver sees light reflected from the...Ch. 27 - At what angle is light inside crown glass...Ch. 27 - Light reflected at 55.6° from a window is...Ch. 27 - (a) Light reflected at 62.5° from a gemstone in a...Ch. 27 - If b is Brewster's angle for light reflected from...Ch. 27 - Integrated Concepts If a polarizing filter reduces...Ch. 27 - Integrated Concepts Suppose you put on two pairs...Ch. 27 - Integrated Concepts (a) On a day when the...
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