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Employee safety
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Question 1
Wavelength
The wavelength can be defined as the acute measure of the length between two peaks that are identical to each other or through the low points found in a wave. It is related to frequency and it is usually measured in millimeters, kilometers, meters, and decimeters.
Frequency
Frequency is the number of waves that usually passes a fixed place in unit time. Sometimes it is also termed as the temporal frequency that emphasizes any contrast to angular and spatial frequency. Frequency is mostly used in physical sciences.
Sound Pressure
Sound pressure is the amount of pressure that is measured in a wave that is relative to all the surrounding pressure. Just like any other pressure, sound pressure is usually measured in units called Pascal’s. Sound wave pressure mostly corresponds to how loud a people hear the sound. When the sound pressure increases, there will be an increase of pressure in the eardrum and this makes the sound become louder to the person.
Decibel
A decibel is a common unit that is used for expressing the ratio in between two common physical quantities mostly the amount of electric power or acoustic. It can also be used to measure the loudness of a sound. Decibel is usually represented by the symbol (dB)
Octave Band
An octave band is defined as the amount of frequency band where the amount of highest frequency is double the lowest frequency.
Question 2
A sound level meter is an instrument that is used to measure the intensity of music, noise and other forms of sounds.

A common meter should consist of a good microphone that is used for picking up the sound and later converting it to an electrical form of signal then followed by a circuitry used for operating on all the signals in order to achieve the desired characteristics. In the sound meter, the electronic circuitry is adjustable making it easy to read the level of frequencies. A noise dosimeter is mostly used in most kinds of noise and sound analyses that include scientific noise measuring, traffic and transportation and safety in industries. The two main characteristics of noise dosimeter are the amount of frequency response and the level of dynamic range. The two devices can be used in a company to evaluate the amount of noise by measuring the amount of real sound and analyzing signals, different frequency and time and noise measurement. The devices are mostly used in big industrial companies.
Question 3
Sometimes too much noise can be a major problem to our bodies, therefore; employees who work more than eight hours a day are supposed to be provided with some hearing protection devices. The hearing devices are very important as long as the health of the employee is concerned (Ridley & Channing 2008). The hearing protectors are supposed to be selected and evaluated well by the according to the standards of 29 CFR 191.95. This is to ensure that the devices are up to date and that every worker will be safe. Another safety measure that I would advice is a reduction in working hours. Working in such an environment is very risky because of noise, therefore; I would recommend the company to reduce the number of working hours from eight to six. With reduced working hours the employees have enough time to prepare for the next session. In order to make the above steps become effective employee training is paramount. The company needs to take the workers through training for them to be well equipped with the hearing devices. This training will also include safety measures employees must take in order to ensure they are safe at the place of work. In any company, training is important so that workers become familiar with the culture of the company.
Question 4
C (1) T (1) + C (2) T(2)+ C(n) T(n)
Where Cn = shows the duration of total time that is exposed.
Tn = shows the amount of time of permitted exposure at given level.
Therefore, worker 1;
3× 80.5 + 2 × 81.0 + 2 × 82.0 + 1 × 95.0 = 662.5
Worker 2;
3 × 98.5 + 2 × 86.5 + 2 × 84.5 + 1 × 83.5 = 721.0
Worker 3;
3 × 92.5 + 2 × 85.0 + 2 × 83.5 + 1 × 80.0 = 694.5
In this case Composition of daily exposure to noise has 4 periods having different levels, therefore, their combined effect is considered. In worker 1, noise exposure is 662.5, worker 2 has a noise exposure of 721.0 and worker 3 has a noise exposure of 694.5. Suppose the recommended unity value is 140 dBA then the sum of each worker exceeds the required d BA. Therefore, worker 2 is exposed to highest noise hazard while worker 1 is exposed to lowest noise hazard. Therefore, this workers information should be recorded in the appendix A that contain the noise hazard areas. According to set safety rules, the workers noise exposure exceeds the unity value (Ridley & Channing 2008). This requires for workers to be provided with noise safety during their duties.

References
Ridley, J., & Channing, J. (Eds.). (2008). Safety at work. Routledge.