Fizik Ödev Yardımı
Fizik, tüm doğa bilimleri arasında çok önemli bir konudur, yaşamın harikalarını açıklamak için kullanılır ve aynı zamanda çalışılması en zor konulardan biridir.
QuestionAI, etkileşim halindeki kuvvetler altındaki moleküllerin eşlik eden yörüngeleri ile her bir atom ve onun özellikleri hakkında bilgi edinebileceğiniz, fiziğe yeni başlayanlar için zengin ve kolay bir fizik problemi çözücüdür. Elbette galaksiler arasında saklı sırları diğer fizik meraklılarıyla da keşfedebilirsiniz. Tahminlerinizi ve sorularınızı yapay zekaya cesurca yöneltin; kolayca güvenilir yanıtlar bulacaksınız.
- OLASTION (c) PHYS III (a) 1. Sinte the principle of dimensional homogeneity B. The second kinematic equation is given by s=ut+(1)/(2)at^2 . Show that it is dimensionally correct (to Using the second kinematic equation, derive the third kinematic exquarition v^2=w^2+2as (6) marks) (5 marlie) 1. Force is a concept that is commonly encountered in physics. State the deflinotion of the term forec (2 marks) i. Then state which of Newton's laws is used to define the concept of force and then write out this law (3 marks) (d) i. Distinguish between work and energy. (2 marking ii. In which way are work and energy related? (1) much) iii. State the principle that connects work and energy, then write the statement of this principle in words (3 marks) iv. Starting with the definition of work as W=F_(s) where all the symbols have their usual momings, derive the mathematical expression for the theorem connecting work and energy tcl (5 marks) 1. State the definition of the term momentum. ii. Write down the statement of the law of conservation of linear momentum iii. What does it mean if a collision is said to be elastic? is. What does it mean if a collision is said to be completely inclastic? X. A system consists of two masses. m and ma Before collision.the second mass m is a rest while the first mass m.is moving with an initial velocity dot (u)_(1) in a straight line.. The first mass collides with the second mass and then the two masses move off together still in a straight line in the same direction as that of the initial velocity of the first mass , with a common valueity D. If the solal kinetic energy before collision is sum T_(1)=m_(1)u_(1)^2/2 then show that the casio of the lotal instind kinstic energy to the total final kinetic energy is given by (m_(2))/(2(m_(1)+m_(2))) (5 marks) (2 marks) (1mark) (2. marks) (2 marks) (1 mark)
- PHYS III QUESTION MARKS) (B) (i) Physics can be defined as the study of the interaction between matter and energy. It is art empirical science which means it is based on measurement What are the basic fundamental measurable quantities in physics called? Also state the quantities that are encountered mechamics (2) market (ii) These fundamental measurable quantities have an important application.namely.verifying physical laws expressed as equations State the principle upon which this application is hased (2) marks) (iii) Using this principle , explain if the following equation is correct, d=v/t where it is distance, va velocity and re-time (4 marks) (b) (i) in physics one way of classifying physical quantities is to classify them as either scalars or vectors Explain how a vector differs from a scalar and give an example of one. (ii) A.coin on a nat table is first of all moved 2cm from left to right in a straight line then moved 3cm in a straight line at an angle of 60^circ above its original direction (2 marks) 1. Determine the displacement of the coin from its original position in terms of unit vectors (4)/(3) and hat (i) where i is the unit vector in the positive x direction from left to right and hat (i) is the unit vector in the positive y direction from bottom to top 2. How far away from the original position is the com? (2 marks) (2. marks) (c) ciassical Newtonian mechanies cinematics can be drined as thestudy of motion without taking amo account the forces causing the motion State the finear kinematic equations.(3 marks) (ii) Kouch throws a stone at a bird which is directly above his head Unfortunately he misses as Also signs stops just before it hits the bird A. Af the bird was som directly above Rotich calculate the speed with which the stone left his hand (2 marks) 2. For what length of time did the stone travel before stopping? (2 marks)
- Two disks of equal masses, one orange and the other yellow are involved in an elastic glancing collision. The yellow disk is initially at rest and is struck by an orange disk moving with a speed of 5 mathrm(~m) / mathrm(s) in the direction of the positive x -axis. After collision, the orongle disk moves along a direction that makes an angle of 37^circ with its initial direction of motion. The velocities of two disks are perpendicular after collision. If vec(v)_(0), vec(v)_(y), vec(V)_(0), vec(v)_(y) are initial and final velocities of the orunge and yellow disks respective and the total initial momentum is varepsilon vec(P)_(i)=5 mathrm(mi) , then determine the final speed of each disk.
- (f) Estimate the energy of the characteristic X-ray emitted from a tungsten target when an electron drops from a N shell (n=4) to a vacancy in the K shell (n=1)cdot Z=74 . (5 marks) (g) Draw an energy level diagram for hydrogen and at least show four series. (4 marks) (h) The nuclear reaction (}_{0)^1n+_(5)^10Barrow _(3)^7Li+_(2)^4He is observed to occur even when very slow moving neutrons (Mn=1.0087u) strike a boron atom at rest. For a particular reaction in which KE=0 , the helium (M_(He)=4.0026u) is observed to have a speed of 9.30ast 106m/s Determine (i) The KE of the lithium (M_(Li)=7.0160) (ii) The Q value of the reaction Page 1 of 3 PHYS 414 (4 marks) (2 marks)
- (a) Define the terms nuclear fusion and nuclear fission. (2 marks) (b) The electron in the hydrogen atom makes transition from the n=4 to the ground state. Find the wavelength and frequency of the emitted photon. (R_(H)=1.097times 10^7M^-1) (4 marks) (c) Show that E_(n)=(-m_(e)k_(e)^2e^4)/(2h^2)((1)/(n^2))n=1,2,3ldots (4 marks) (d) State Pauli's Exclusion principle (2 marks) (e) Write electronic configuration of z=21 utilizing exclusion principle. (3 marks) (f) Estimate the energy of the characteristic X-ray emitted from a tungsten target when an electron drops from a N shell (n=4) to a vacancy in the K shell (n=1)cdot Z=74 (5 marks) (g) Draw an energy level diagram for hydrogen and at least show four series. (4 marks) (h) The nuclear reaction (}_{0)^1n+_(5)^10Barrow _(3)^7Li+_(2)^4He is observed to occur even when very slow moving neutrons (Mn=1.0087u) strike a boron atom at rest. For a particular reaction in which KE=0 the helium (M_(He)=4.0026u) is observed to have a speed of 9.30ast 106m/s Determine (i) The KE of the lithium (M_(Li)=7.0160) (4 marks) (ii) The Q value of the reaction (2 marks) QUESTION TWO (20 MARKS) (a) A "clever" technician decides to heat some water for his coffee with an x-ray machine . If the machine produces 10rad/s how long will it take to raise the temperature of a cup of water by 50^circ C ? Ignore heat losses during this time? (6 marks) (b) In a certain experiment, 0.024'' LCi of (}_{15)^32Pis injected into a medium containing a culture of bacteria. After 2 hours the cells are washed and a detector that is 70% efficient (counts 70% of emitted rays) records 1440 counts per minute from all the cells.. What percentage of the original was taken up by the cells? (3 marks) (c) Show that half-life of a radioactive material can be expressed as t_((1)/(2))=(0.693)/(lambda ) where lambda =decay constant (3 marks) (iii) Why is the quantity of energy different in the two (1 mark) (d) An isotope of an element radon has half -life of 8 days,, a sample of radon originally contains 8.2ast 10^16 atoms, take one day to be 86times 10^3 seconds, calculate (i) The number of radon atoms remaining after 32 days. (2 marks) (ii) The rate of decay of the radon sample after 32 days. (2 marks) PHYS 414