COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 23, Problem 9QAP
To determine
The change in color of moon, during total lunar eclipse.
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Physics
Many nocturnal animals demonstrate the phenomenon of eyeshine, in which their eyes glow various colors at night when illuminated by a flashlight or the headlights of a car (see the photo). Their eyes react this way because of a thin layer of reflective tissue called the tapetum lucidum that is located directly behind the retina. This tissue reflects the light back through the retina, which increases the available light that can activate photoreceptors, and thus improve the animal’s vision in low-light conditions. If we assume the tapetum lucidum acts like a concave spherical mirror with a radius of curvature of 0.750 cm, how far in front of the tapetum lucidum would an image form of an object located 30.0 cm away? Neglect the effects of the other structures of the eye, such as the cornea and lens.
Does the refractive index of a certain material depend on the color of light incident on it? Explain.
Chapter 25: Problem 5: In the year 1178, five monks at Canterbury Cathedral in England observed what appeared to be an asteroid colliding with the moon, causing a red glow in and around it. It is hypothesized that this event created the crater Giordano Bruno, which is right on the edge of the area we can usually see from Earth.
a) How long after the asteroid hit the Moon, which is 3.84 ×10⁵ km away, would the light first arrive on Earth in seconds?
Chapter 23 Solutions
COLLEGE PHYSICS
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- The Tunguska event. On June 30, 1908, a meteor burned up and exploded in the atmosphere above the Tunguska River valley in Siberia. It knocked down trees over thousands of square kilometers and started a forest fire, but produced no crater and apparently caused no human casualties. A witness sitting on his doorstep outside the zone of falling trees recalled events in the following sequence. He saw a moving light in the sky, brighter than the Sun and descending at a low angle to the horizon. He felt his face become warm. He felt the ground shake. An invisible agent picked him up and immediately dropped him about a meter from where he had been seated. He heard a very loud protracted rumbling. Suggest an explanation for these observations and for the order in which they happened.arrow_forwardCan a sound wave in air be polarized? Explain.arrow_forwardThere was a major collision of an asteroid with the Moon in medieval times. It was described by monks at Canterbury Cathedral in England as a red glow on and around the Moon. How long after the asteroid hit the Moon, which is 3.84105km away, would the light first arrive on Earth?arrow_forward
- As a result of his observations, Ole Roemer concluded that eclipses of Io by Jupiter were delayed by 22 min during a six-month period as the Earth moved from the point in its orbit where it is closest to Jupiter to the diametrically opposite point where it is farthest from Jupiter. Using the value 1.50 × 108 km as the average radius of the Earth’s orbit around the Sun, calculate the speed of light from these data.arrow_forward2. If light passes through a piece of tinted glass, 35% is absorbed. Then, it passes through second piece of tinted glass, another 35% is absorbed. So what is the final percentage that passes through both, compared to original 100%? a. 30%, b. 65%, c. 42.3%, d. 22.8%arrow_forwardLunar astronauts placed a reflector on the Moon’s surface, off which a laser beam is periodically reflected. The distance to the Moon is calculated from the round-trip time. (a) To what accuracy in meters can the distance to the Moon be determined, if this time can be measured to 0.100 ns? (b) What percent accuracy is this, given the average distance to the Moon is 3.84×108 m ?arrow_forward
- When unpolarised light is passed through a polariser, and then through an analyser with its polarising axis at a right angle to the axis of the polariser, the intensity of the remaining light is approximately zero. When a second polarising sheet is placed between the polariser and the analyser, the final intensity is much brighter and clearly non-zero. Explain how this can happen.arrow_forwardRed light has an magnetic field component amplitude Bm = 8 μT, and wavelength λ= 440 nm - calculate the angular wave numberarrow_forwardIf light of different frequencies has different speeds in a material, does it also refract at different angle as it enters the same material? Explainarrow_forward
- The explanation given in your textbook for the color of the setting Sun should apply equally well to the rising Sun, since sunlight travels the same distance through the atmosphere to reach your eyes at either sunrise or sunset. Typically, however, sunsets are redder than sunrises. Why? (Hint: Particles of all kinds in the atmosphere contribute to scattering.)arrow_forwardLunar astronauts placed a reflector on the Moon’s surface, from which a laser beam is periodically reflected. The distance to the Moon is calculated from the round-trip time. To what precision, in meters, can the distance to the Moon be determined, if this time can be measured to 0.105 ns?arrow_forwardA traffic light shows green (540 nm wavelength) when cars may go through it, andred (420 nm wavelength) when cars must stop. If a car were to be moving fast enoughfor the Doppler effect to make a red light appear green, would the car have to bemoving towards or away from the light? Justify your answer.arrow_forward
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