Connect with LearnSmart for Krauskopf: The Physical Universe, 16e
16th Edition
ISBN: 9781259663895
Author: KRAUSKOPF, Konrad B.
Publisher: Mcgraw-hill Higher Education (us)
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Chapter 7, Problem 41MC
To determine
The speed of waves.
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Chapter 7 Solutions
Connect with LearnSmart for Krauskopf: The Physical Universe, 16e
Ch. 7 - Prob. 1MCCh. 7 - Prob. 2MCCh. 7 - Prob. 3MCCh. 7 - Prob. 4MCCh. 7 - Prob. 5MCCh. 7 - Prob. 6MCCh. 7 - Prob. 7MCCh. 7 - Prob. 8MCCh. 7 - Prob. 9MCCh. 7 - Six flutes playing together produce a 60-dB sound....
Ch. 7 - Prob. 11MCCh. 7 - Prob. 12MCCh. 7 - Maxwell based his theory of electromagnetic (em)...Ch. 7 - In a vacuum the speed of an em wave a. depends...Ch. 7 - Prob. 15MCCh. 7 - Prob. 16MCCh. 7 - Prob. 17MCCh. 7 - Light waves a. require air or another gas to...Ch. 7 - Prob. 19MCCh. 7 - The ionosphere is a region of ionized gas in the...Ch. 7 - Prob. 21MCCh. 7 - Prob. 22MCCh. 7 - Prob. 23MCCh. 7 - Prob. 24MCCh. 7 - Prob. 25MCCh. 7 - Prob. 26MCCh. 7 - Prob. 27MCCh. 7 - Prob. 28MCCh. 7 - Prob. 29MCCh. 7 - Prob. 30MCCh. 7 - Prob. 31MCCh. 7 - Prob. 32MCCh. 7 - Prob. 33MCCh. 7 - Thin films of oil and soapy water owe their...Ch. 7 - The sky is blue because a. air molecules are blue...Ch. 7 - Diffraction refers to a. the splitting of a beam...Ch. 7 - The useful magnification of a telescope is limited...Ch. 7 - Prob. 38MCCh. 7 - The speed of sound waves having a frequency of 256...Ch. 7 - The wavelength of sound waves having a frequency...Ch. 7 - Prob. 41MCCh. 7 - Prob. 42MCCh. 7 - Prob. 43MCCh. 7 - Prob. 44MCCh. 7 - Prob. 45MCCh. 7 - (a) Distinguish between longitudinal and...Ch. 7 - Prob. 2ECh. 7 - Water waves whose crests are 6 m apart reach the...Ch. 7 - Water waves are approaching a lighthouse at a rate...Ch. 7 - At one end of a ripple tank 90 cm across, a 6-Hz...Ch. 7 - A 1.2-MHz ultrasonic beam is used to scan body...Ch. 7 - Why does sound travel fastest in solids and...Ch. 7 - The speed of sound in a gas depends upon the...Ch. 7 - Even if astronauts on the moons surface did not...Ch. 7 - What eventually becomes of the energy of sound...Ch. 7 - A person is watching as spikes are being driven to...Ch. 7 - Prob. 12ECh. 7 - Find the frequency of sound waves in air whose...Ch. 7 - Prob. 14ECh. 7 - Prob. 15ECh. 7 - A violin string vibrates 1044 times per second....Ch. 7 - Prob. 17ECh. 7 - A double star consists of two nearby stars that...Ch. 7 - The characteristic wavelengths of light emitted by...Ch. 7 - Why are light waves able to travel through a...Ch. 7 - How could you show that light carries energy?Ch. 7 - Prob. 22ECh. 7 - Prob. 23ECh. 7 - Which of the following waves cannot be polarized:...Ch. 7 - Prob. 25ECh. 7 - Prob. 26ECh. 7 - Visible light of which color has the lowest...Ch. 7 - A radar signal took 2.7 s to go to the moon and...Ch. 7 - An opera performance is being broadcast by radio....Ch. 7 - Prob. 30ECh. 7 - A nanosecond is 109 s. (a) What is the frequency...Ch. 7 - A radar sends out 0.05-s pulses of microwaves...Ch. 7 - Prob. 33ECh. 7 - Prob. 34ECh. 7 - Prob. 35ECh. 7 - Prob. 36ECh. 7 - Can the index of refraction of a substance be less...Ch. 7 - Prob. 38ECh. 7 - When a fish looks up through the water surface at...Ch. 7 - A flashlight at the bottom of a swimming pool...Ch. 7 - Prob. 41ECh. 7 - The olive in a cocktail (n = 1.35) seems to be 30...Ch. 7 - Prob. 43ECh. 7 - Prob. 44ECh. 7 - What is the difference between a real image and a...Ch. 7 - A coin is placed at a focal point of a converging...Ch. 7 - Prob. 47ECh. 7 - Prob. 48ECh. 7 - Prob. 49ECh. 7 - Prob. 50ECh. 7 - Prob. 51ECh. 7 - Prob. 52ECh. 7 - Prob. 53ECh. 7 - The candle of Exercise 53 is 15 cm from the lens....Ch. 7 - Prob. 55ECh. 7 - Prob. 56ECh. 7 - Prob. 57ECh. 7 - Prob. 58ECh. 7 - (a) What is the name of the defect of vision in...Ch. 7 - Prob. 60ECh. 7 - When white light is dispersed by a glass prism,...Ch. 7 - Prob. 62ECh. 7 - Prob. 63ECh. 7 - If the earth had no atmosphere, what would the...Ch. 7 - Prob. 65ECh. 7 - Prob. 66ECh. 7 - Prob. 67ECh. 7 - Prob. 68ECh. 7 - Radio waves are able to diffract readily around...Ch. 7 - A radar operating at a wavelength of 3 cm is to...Ch. 7 - Prob. 71ECh. 7 - At night the pupils of a certain womans eyes are 8...
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- Earthquakes at fault lines in the Earths crust create seismic waves, which are longitudinal (P waves) or transverse (S waves). The P waves have a speed of about 7 km/s. Estimate the average bulk modulus of the Earths crust given that the density of rock is about 2 500 kg/m3.arrow_forwardAn undersea earthquake or a landslide can produce an ocean wave of short duration carrying great energy, called a tsunami. When its wavelength is large compared to the ocean depth d, the speed of a water wave is given approximately by v=gd. Assume an earthquake occurs all along a tectonic plate boundary running north to south and produces a straight tsunami wave crest moving everywhere to the west. (a) What physical quantity can you consider to be constant in the motion of any one wave crest? (b) Explain why the amplitude of the wave increases as the wave approaches shore. (c) If the wave has amplitude 1.80 m when its speed is 200 m/s, what will be its amplitude where the water is 9.00 m deep? (d) Explain why the amplitude at the shore should be expected to be still greater, but cannot be meaningfully predicted by your model.arrow_forwardA sound wave propagates in air at 27C with frequency 4.00 kHz. It passes through a region where the temperature gradually changes and then moves through air at 0C. Give numerical answers to the following questions to the extent possible and state your reasoning about what happens to the wave physically. (a) What happens to the speed of the wave? (b) What happens to its frequency? (c) What happens to its wavelength?arrow_forward
- What is the wavelength of the waves you create in a swimming pool if you splash your hand at a rate of 2.00 Hz and the waves propagate at 0.800m/s ?arrow_forwardThe speed of sound is measured to be 342 m/s on a certain day. What is this in km/h?arrow_forwardDuring a thunderstorm, a frightened child is soothed by learning to estimate the distance to a lightning strike by counting the time between seeing the lightning and hearing the thunder (Fig. P2.25). The speed vs of sound in air depends on the air temperature, but assume the value is 343 m/s. The speed of light c is 3.00 108 m/s. a. A child sees the lightning and then counts to eight slowly before hearing the thunder. Assume the light travel time is negligible. Estimate the distance to the lightning strike. b. Using your estimate in part (a), find the light travel time. Is it fair to neglect the light travel time? c. Think about how time was measured in this problem. Is it fair to neglect the difference between the speed of sound in cold air (vs at 0C = 331.4 m/s) and the speed of sound in very warm air (vs at 40C = 355.4 m/s)?arrow_forward
- Why are soldiers in general ordered to “route step" (walk out of step) across a bridge?arrow_forwardA stone is dropped from rest into a well. The sound of the splash is heard exactly 2.00 s later. Find the depth of the well if the air temperature is 10.0C.arrow_forwardA train whistle (f = 400 Hz) sounds higher or lower in frequency depending on whether it approaches or recedes. (a) Prove that the difference in frequency between the approaching and receding train whistle is f=2u/v1u2/v2f where u is the speed of the train and v is the speed of sound. (b) Calculate this difference for a train moving at a speed of 130 km/h. Take the speed of sound in air to be 340 m/s.arrow_forward
- You are looking at a small, leafy tree. You do not notice any breeze, and most of the leaves on the tree are motionless. One leaf however, is fluttering hack and forth wildly. After a while, that leaf stops moving and you notice a different leaf moving much more than all the others. Explain what could cause the large motion of one particular leaf.arrow_forwardThe ocean floor in underlain by a layer of basalt that constitutes the crust, or uppermost layer, of the Earth in that region. Below this crust is found denser periodotite rock that forms the Earths mantle. The boundary between these two layers is called the Mohorovicic discontinuity (Moho for short). If an explosive charge is set off at the surface of the basalt, it generates a seismic wave that is reflected back out at the Moho. If the speed of this wave in basalt is 6.50 km/s and the two-way travel time is 1.85 s, what is the thickness of this oceanic crust?arrow_forwardAt rest, a cars horn sounds the note A (440 Hz). The horn is sounded while the car is moving down the street. A bicyclist moving in the same direction with one-third the cars speed hears a frequency of 415 Hz. (a) Is the cyclist ahead of or behind the car? (b) What is the speed of the car?arrow_forward
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