Sph2161:Physics Ii Question Paper
Sph2161:Physics Ii
Course:Bachelor Of Horticulture
Institution: Meru University Of Science And Technology question papers
Exam Year:2013
QUESTION ONE (30 MARKS)
a) Explain briefly what is meant by the dual nature of light. (4 Marks) b) Differentiate between convex and concave lenses and hence list four optical instruments that uses lenses. (6 Marks) c) Explain how myopia and hyperopia, the two main defects of human eye, occurs and how they are corrected. (4 Marks) d) Define the following terms and give their SI units; i. Capacitance ii. Resistivity iii. Potential difference. (6 Marks) e) Differentiate between soft and hard x-rays and give one use of each. (4 Marks) f) State the three main emissions of a radioactive nuclide and briefly explain how each is produced. (6 Marks)
QUESTION TWO (20 MARKS)
a) A concave mirror has a radius of curvature of 5m. An object initially 2m infront of the mirror is moved back until it is 6m from the mirror. Describe how the image location changes. (10 Marks) b) A beam of light strikes one fact of a window pane with an angle of incidence of 30°. The beam travels through the glass and emerges from a parallel face from the opposite side. Ignoring reflection; i. Find the angle of refraction of the ray inside the glass. (n= 1.52 for the glass).
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ii. Show that the rays in air on either side of the glass are parallel to each other. (10 Marks)
QUESTION THREE (20 MARKS)
a) In her job as a dental hygienist, Atieno uses a convex mirror to see the back of her patients teeth. When the mirror is 1.2cm from a tooth, the image is upright and 3 times as large as the tooth. What are the; i. Focal length ii. Radius of curvature of the mirror. (6 Marks) b) An object 4cm high is placed 16cm infront of a converging lens of focal length 8cm. Find the location and nature of the image formed. (6 Marks) c) An object that is 6cm tall is placed 40cm infront of a diverging lens. The power of the lens is -5D. Find the location and nature of the image formed. (8 Marks)
QUESTION FOUR (20 MARKS)
a) A metal sphere A has a charge Q. Two other spheres B and C are identical to A only that they have zero net charge. A touches B, then the two spheres are separated. B touches C, then these spheres are separated. Finally C touches A and these two spheres are separated. How much charge is on each sphere? (6 Marks) b) ? ? d 2d
In the figure above, a third point charge – q is placed at point P. What is the electrostatic force on –q due to the other two point charges? (6 Marks) c) Consider a 60W light bulb and a 100W light bulb designed for use in a household lamp socket at 120V. i. What are the resistances of these two bulbs? ii. If they are connected in a series circuit, which bulb shines brighter? Explain. iii. If they are connected in parallel circuit, which bulb shines brighter? Explain. (8 Marks)
QUESTION FIVE (20 MARKS)
d) The half life of (I – 131 is 8 days. A sample containing I – 131 has an activity of 6.4 × 108???? . How many days later will the sample have an activity of 2.5 × 106????? (4 Marks) e) Differentiate between nuclear fission and nuclear fusion. (4 Marks) f) State and briefly explain two positive uses of x-rays and two positive uses of radioactivity. (8 Marks) g) Write out the reaction and identify the daughter nuclide when ???? 11 22 decays by emitting a positras. (4 Marks)
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