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sukhopar [10]
2 years ago
13

Dolphins communicate using compression waves (longitudinal waves). Some of the sounds dolphins make are outside the range of hum

an hearing. Upon spotting a hungry shark, dolphin A sends a message to dolphin B. To send this message as effectively as possible, dolphin A would
A.make a softer sound because the shark will not hear the softer signal.
B.send the message above the water when it jumps because air is more dense than water, and the sound would be louder above the water.
C.send the message underwater because a more dense medium produces a louder sound.
D. make a higher pitched signal because a higher pitch is a louder sound. Question 2 Unsaved Compare wave A with wave B correctly in relation to amplitude.
A. Wave A will have a higher pitch than wave B
B.Wave B will have a higher pitch than wave A
C.Wave A will have a louder sound than wave B
D. Wave B will have a softer sound than wave A. Save Question 3 (2 points) Question 3 In old times, before there were train signals, people who worked on the railroad would often put their ear down to the train track to listen for an oncoming train. Why would this result in hearing the train further off than just listening for the train through the air?
A. Sound waves travel faster in more dense material, and the more dense the material the louder the sound is.
B. People did not do this because sound travels faster through less dense material, like air, rather than more dense materiel, like train tracks.
C.Sound travels slower, but louder through solid material because it is more dense, so the train could be heard better this way.
D. Sound travels slower in air because there are often trees and other items blocking the sound.
Question 4 Unsaved Sound waves are mechanical waves in which the particles in the medium vibrate in a direction parallel to the direction of energy transport. What is another name for the type of wave that transfers energy in this way?
A. longitudinal waves
B. surface waves
C. pressure waves
D. transverse waves
Question 5 Which shows the loudest sound?
A because this shows the most dense material.
B because the particles are bigger than A.
C because the particles are shown are the most dense material because they are bigger and closer together
D because these are the biggest particles, and are therefore, the most dense. Question 6 What happened to the amplitude from wave A to wave B?
A. The amplitude doubled
B.The amplitude tripled
C. The amplitude decreased
D. The amplitude didn't change
Question 7 Identify the amplitude on the diagram and give the correct description.
C because the wavelength shows amplitude.
C because amplitude is the distance from wave crest to wave crest.
D because amplitude is the distance between a crest (or trough) and rest.
D because wavelength show simplitude.
Chemistry
1 answer:
Alchen [17]2 years ago
8 0
Question 4 is <span>A. longitudinal waves </span>
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5. A sample of benzene (C6H6), weighing 7.05 g underwent combustion in a bomb calorimeter by the following reaction:
Cloud [144]

Answer:

A sample of benzene (C6H6), weighing 7.05 g underwent combustion in a bomb calorimeter by the following reaction:

2 C6H6 (l) + 15 O2 (g) → 12 CO2 (g) + 6 H2O (l)

The heat given off was absorbed by 500 g of water and caused the temperature of the water and the calorimeter to rise from 25.00 to 53.13 oC. The heat capacity of water = 4.18 J/g/oC and the heat capacity of the calorimeter = 10.5 kJ/oC. (1) what is the ΔH of the reaction?

Explanation:

The heat energy released by the reaction = heat absorbed by calorimeter + heat absorbed by water

Heat absorbed by water = mass of water x specific heat capacity of water x change in temperature

Heat absorbed by water =  500 g x 4.18 J/g. oC x (53.13-25.00)oC

                                         = 58791.7 J

Heat absorbed by calorimeter = heat capacity of calorimeter x change in temperature

Heat absorbed by calorimeter = 10.5 x 10^3 J /oC  x (53.13-25.00)oC

                                                  =295365 J

Total heat energy absorbed = 58791.7 J + 295365 J  = 354156.7 J

Number of moles of benzene given is:

number of moles = goven mass of benzene /its molar mass

=7.05 g / 78.0 g/mol

=0.0903mol

Hence, the heat released by the reaction is:

= 354156.7 J / 0.0903 mol

=  3922.00 kJ/mol

Answer:

The heat released during the combustion of 7.05g of benzene is 3922.00kJ/mol.                                              

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Please describe what’s happening in this reaction!! for brainlest answer
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Answer:

The correct answer is - nuclear fission.

Explanation:

In the given diagram, the reaction is a graphical representation of the nuclear fission of one nucleus of Uranium 235 into two nuclei of Kr with three neutrons that leads to a chain reaction and releases a huge amount of energy and grow out of control.

With every fission, there are two neutrons emitted which results in splitting more nucleus into two nuclei and keep on growing and never die out. The amount of energy also keeps on growing with an increase in the reactions and fission. This reaction is used to generate electricity and nuclear weapons.

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