Applying the properties of longitudinal waves Calculate the frequency of a longitudinal sound wave of wavelength 0,5 m
that travels through steel at a speed of 5 060 m-s!
2 A cello string vibrates with a frequency of 64 Hz. If the wavelength of the
waves in the string is 180 cm, calculate the wave speed.
3 Explain why it is impossible for sound to travel through a vacuum.
4 Calculate the wavelength of the sound waves that are produced by a tuning
fork marked C-264 Hz. Take the speed of sound in air as 343 ms.
5 A boy stands between two tall buildings. When he claps his hands, he hears
the echo from one building after 2 s and the next echo from the other
building after 3 s. Calculate the distance between the buildings. Take the
speed of sound in air as 343 ms
6 The audible range is between 20 Hz and 20 kHz.
a) If the velocity of sound in air is 343 m s', calculate the wavelength of the
highest and lowest notes.
b) Determine how many of each wavelength that you calculated in a)
would fit into a room 4 m long.​

Ithink the dna sequences may vary but the amino acid sequences are identical. 

Environmental science studies the interactions between the physical, chemical, and biological components of the environment, including their effects on all types of organisms. earth science (also known as geoscience), is an inclusive term for all sciences related to earth (geology, meteorology, oceanogr maphy, etc).  although environmental and earth science cover essentially the same material, environmental science places greater emphasis on the biological realm, while earth science places greater emphasis on the physical realm.    environmental and earth science study the interactions of four major systems or “spheres” (figure 8.6).  the  geosphere  consists of the core, mantle and crust of the earth.the  atmosphere  contains all of the earth’s air and is divided into troposphere, stratosphere, mesosphere, thermosphere and ionosphere.the  hydrosphere  contains all of the solid, liquid and gaseous water on earth, extending from the depths of the sea to the upper reaches of the troposphere where water is found.  ninety-seven percent of the hydrosphere is found in salty oceans, and the remainder is found as vapor or droplets in the atmosphere and as liquid in ground water, lakes, rivers, glaciers and snowfields.  the  biosphere  is the collection of all earth’s life forms, distributed in major life zones known as biomes:   tundra, boreal forest, temperate deciduous forest, temperate grassland, desert, savannah, tropical rainforest, chaparral, freshwater, and marine.although the four systems have their unique identities, there is substantial interaction between them.  environmental scientists study the effects of events in one sphere on the other spheres. for example, a volcanic eruption in the geosphere may cause profound direct and indirect effects on the hydrosphere, atmosphere and biosphere as follows: example 1 (volcano)    on may 18, 1980, mount saint helens, in the state of washington, erupted.  this event altered the surrounding environment, and provided scientists with an opportunity to study the effects of volcanic eruptions on the geosphere, hydrosphere, atmosphere and biosphere.  such studies are vital because volcanic eruptions will continue to occur, and will have increasing impact on humans as people continue to settle lands closer to dormant volcanoes. the following are but a few of the myriad of interactions resulting from a volcanic