Task2. Solve the problems.

Summative assessment

Term 3

Name______________________ Grade___________Date__________

Task1. Fill in the blanks

1. At constant temperature, an ideal gas is at s pressure of 20 cm of mercury and a volume of 5 L. If the pressure is increased to 40 cm of mercury, the new volume will...........................................2.5 L.............................................(point 1)

2. At constant volume, an ideal gas is heated from 5 °C to 283°C. The original pressure was 1.5 atm. After heating, the pressure will be …………………………………3 atm…………………………………….(point 1)

3. At constant pressure, 6 m³ of an ideal gas at 75°C is cooled until its volume is halved. The new temperature of the gas will be…………………………………150C или 423 K…………………………………..(point 1)

4. What is the efficiency of a heat engine that performs 700 J Of useful work from a reservoir of 2700 J?......................26%..................................(point 1)

5. When light passes from a more optically dense medium into a less optically dense medium, it will bend......towards.................. (towards, away from) the normal................................................................................................. (point 1)

6. Characteristics of an image that formed by concave lens is…………virtual, upright, diminished, located on the object’s side of the lens……………………………………………………..…….(point 1)

7. The average velocity or root mean square velocity of a molecule in a sample of oxygen at 0 °C is……......461.3 m/s...................................................(point 1)

Task2. Solve the problems.

8. Calculate the critical angle for the diamond-air boundary. Draw the diagram for solution. Refer to the table of indices of refraction if necessary. (point 2)

9. The p-V diagram shown is that of an ideal engine cycle. Calculate for each processes work, change in internal energy and heat. Make a table and show your results in a table.

(points 4)

10. Explain the phenomena DISPERSION. Dispersion is the idea that the frequency of a wave depends on its velocity (speed)......................................(point 2)

11. For the lens shown in figure

a) Find the focal length of the thin lens shown. The index of refraction is 1.5 b) A 12cm-tall object is placed 50cm away from this lens. Find the image location and height.

c) Is this image real or virtual?

d) Draw the ray diagram. (point 4)

12. Using the data for the three cases, shown in figures to given for the lens, shown in figure.

a) determine the focal length of the lens.

b) determine the type of the lens. Explain your answer.(point3)

d_o=349cm; d_i=256cm  

d_o=269cm; d_i=339cm

d_o=94cm; d_i=-246cm

Reflection.

№	Tasks	Rubrics	Criterion	Score
		A student	A	B	C	D
	Question on the ideal gas law (Boyle’s -Mariott)	knows the formula of the given law
	Question on the ideal gas law (Charles)	knows the formula of the given law
	Question on the ideal gas law (Gay-Luccacs)	knows the formula of the given law
	Question on the efficiency of the heat engine	knows the formula of efficiency
	Question on the phenomenon of refraction of light	understands the concept of refraction
	Question on image formed by a converging lens	understands characteristics of image
	Question on kinetic theory of ideal gas	able to calculate the root- mean square velocity of the ideal gas molecules motion by the formula
	Problem on the total internal refraction phenomenon	able to draw ray diagram, calculate the critical angle for the given substance
	Problem on ideal engine cycle	able to - use the data from the graph to determine work, change in internal energy, heat at each step of the cycle, -make a proper table
	Question on the dispersion phenomenon	-demonstrates ability to summarize knowledge on refraction phenomena to explain dispersion of light
	Problem on a thin lens formula	shows the ability to -analyze the given information to solve the problem –to calculate the focal length, location of image, height of image; to describe the image formed; - to sketch the ray diagram for the given situation.
	Problems on the thin lens	exhibits the ability to - to make proper calculations on the base of the data given graphically; -transfer the correct data to for the proper explanation of the type of the lens
	Total

Дата добавления: 2015-10-30