I need it to be done ASAP

2. (a) The severe acute respiratory syndrome coronavirus 2 virus (SARS-CoV-2), the virus responsible for COVID-19. is approximately spherical in shape with a diameter that has variously been reported as lying between 50 and 150 nm. For a diameter of your choice, what is the surface area-to-volume ratio of a SARS- COV-2 virus? How does your answer compare to a red blood cell 7 um in diameter? [15%) (b) Discuss some of the factors that are important in the vapour-liquid-solid growth of silicon nanowires using silane (SiH) as a gaseous precursor and a gold support catalyst. You may assume that the melting point of pure gold is 1064C, the melting point of pure silicon is 1414C, but at a composition of 81% gold:19% silicon the Au-Si alloy melts at 363C. [15% A small segment of a single walled carbon nanotube (CNT) is shown in Figure 2. Using reasonable and stated assumptions, determine the chiral indices (n, m). Comment on some of the structural and electronic properties of the CNT shown. Figure 2: A segment of a single walled carbon nanotube [15%) (d) A field emission array is fabricated from a square arrangement of individual multiwalled CNTs of 10 nm in diameter and 5 um in length. (d) A field emission array is fabricated from a square arrangement of individual multiwalled CNTs of 10 nm in diameter and 5 um in length. (1) What is the field emission current from one nanotube in an applied field of 5 V/um. Take the work function of the nanotube to be 4.9 eV. State clearly your assumptions. [15%) What is the number of CNTs per cm if the spacing between nearest neighbour nanotubes is to be twice the length of the nanotube? What is the efficiency of the array if the measured current density is 10 A/cm?? [15%) 2. (a) The severe acute respiratory syndrome coronavirus 2 virus (SARS-CoV-2), the virus responsible for COVID-19. is approximately spherical in shape with a diameter that has variously been reported as lying between 50 and 150 nm. For a diameter of your choice, what is the surface area-to-volume ratio of a SARS- COV-2 virus? How does your answer compare to a red blood cell 7 um in diameter? [15%) (b) Discuss some of the factors that are important in the vapour-liquid-solid growth of silicon nanowires using silane (SiH) as a gaseous precursor and a gold support catalyst. You may assume that the melting point of pure gold is 1064C, the melting point of pure silicon is 1414C, but at a composition of 81% gold:19% silicon the Au-Si alloy melts at 363C. [15% A small segment of a single walled carbon nanotube (CNT) is shown in Figure 2. Using reasonable and stated assumptions, determine the chiral indices (n, m). Comment on some of the structural and electronic properties of the CNT shown. Figure 2: A segment of a single walled carbon nanotube [15%) (d) A field emission array is fabricated from a square arrangement of individual multiwalled CNTs of 10 nm in diameter and 5 um in length. (d) A field emission array is fabricated from a square arrangement of individual multiwalled CNTs of 10 nm in diameter and 5 um in length. (1) What is the field emission current from one nanotube in an applied field of 5 V/um. Take the work function of the nanotube to be 4.9 eV. State clearly your assumptions. [15%) What is the number of CNTs per cm if the spacing between nearest neighbour nanotubes is to be twice the length of the nanotube? What is the efficiency of the array if the measured current density is 10 A/cm?? [15%)