Download Junior Semester Exam Review

Junior Semester Exam Review
Light and Optics
1. The frequencies of light that stimulate the cells in the human retina and can therefore be combined to form any
color are called _________________________.
2. A lens that bends light so that it is focused on a common point is called a __________________ lens.
3. The _______________________ of a spherical mirror or lens is ____________________ the focal length of the
mirror or lens.
4. The relationship between the angle of incidence and the angle of refraction is described by
_______________________.
5. The ratio of the speed of light in a vacuum to the speed of light in a material is known as the material’s
______________________________.
6. An image that can be projected onto a screen is a ____________________ image and it is always oriented
_____________________ compared to the object.
7. Why does light change direction when it moves from one medium into another at an angle?
8. When light from a distant source is incident parallel to the principal axis of a convex lens or a concave mirror the
light is reflected or refracted through which point?
9. A plane mirror produces an image that is (upright/inverted), (real/virtual), and (smaller/ larger/ same size) as the
object. {circle the words that make this sentence true}
10. What color would a cyan pigment appear under yellow light?
11. Yellow light shines on a zinc plate and causes minimal photoelectron ejection.
a. What can you do to increase the amount of photoelectrons ejected?
b. How do you increase the kinetic energy of the photoelectrons?
12. How are astronomers able to determine the chemical composition of stars that are more than a billion miles
away?
13. A radio wave has a wavelength of 3.0x104m, what is the frequency of this wave?
14. How long does it take for light to reach Earth from Mars if Mars is 5.46x1010m from Earth?
15. An object is placed 33.9 cm from a convex lens. If the image is formed 13.95 cm from the lens, how much
smaller than the object is the image?
16. What is the radius of curvature of the lens in the previous question?
17. Light in air is incident on an unknown material at an angle of 33° from the normal. If the refracted ray is
measured to be 12° from the normal, what is the index of refraction of the unknown material?
18. Nuclear fusion, the process that fuels the stars, involves the fusing of hydrogen atoms into helium atoms. When
this occurs, the resulting mass of the helium nucleus is slightly less than the sum of the masses of the hydrogen
atoms that formed it. If this reaction produces 3.552 x 10-13 joules of energy, what mass was “lost”?
Electricity and Magnetism
19. What are three ways to charge an object?
20. Write out coulomb’s law and tell what each letter represents, and what it can be used to calculate.
21. In the electroscope picture below, which is the correct charges on the electroscope at each point?
a. A is + and B is –
b. A is – and B is +
c. A is + and B is +
d. A is – and B is –
22. What is the force between a +2.5x 10-6 C and a -5.0x10-6C charges that are
2.0cm apart?
23. What is the charge of an electron in coulombs?
Junior Semester Exam Review
24. What is Ohm’s law and what do each letter represent and what unit is each measured in?
25. Draw a picture of a 9 volt battery and three 15ohm resistors in series. Calculate the equivalent resistance of the
circuit and the amps in each resistor and the total power of the circuit.
26. Draw a picture of a 9 volt battery and three 15ohm resistors in parallel. Calculate the equivalent resistance of
the circuit and the amps in each resistor and the total power of the circuit.
27. An ammeter is always in _________ with the device your are measuring the current of, whereas a voltmeter is
always in __________with the device you are measuring the potential difference of.
28. Why is it better to have christmas lights wired in parallel than in series?
34. What are the three right hand rules, define and explain each of them.
35. What is the secondary voltage on a step down transformer if 2200V enters the primary coil of 2000 wraps of coil
and the secondary coil has 100 wraps of coil.
Formula:
Simple Harmonic & Waves Review
1. A hiker shouts towards a vertical cliff 685m away, the echo is heard 4.00s later.
A. What is the speed of sound of the hiker’s voice in air?
B. The wavelength of the sound is 0.75m. What is its frequency?
C. What is the period of the wave?
2. What is the frequency of a sound wave moving in air at room temperature (20°C) with a wavelength of 0.667m? SHOW WORK.
3. A 450Hz tuning fork is heard loudest in an open-pipe resonator when its length is 39cm. What is the temperature of the air?
_____4. What is a wave?
A. single disturbance in a medium
B. repeating wave pulses
C. rhythmic disturbance
D. displacement from equilibrium
Junior Semester Exam Review
______5. What type of wave is this?
A. Transverse
B. Longitudinal
C. Surface
D. Incident
______6. Which of the following best describes the wave in this picture?
A. Reflection wave
Use the following picture to answer questions 5 – 9.
7. Crest______
8. Equilibrium______
B. Wave Pulse
9. Wavelength______
C. Continuous Wave D. Surface Wave
10. Trough_______
11. Amplitude______
______12. A wave takes 0.0345s to complete itself. This statement is describing what characteristic of a wave?
A. Frequency
B. Period
C. Wavelength
D. Amplitude
Use this picture for questions 13 – 15.
______13. Identify the Incident wave.
A
B
C
______14. Identify the reflection wave.
A
B
C
______15. What type of boundary is point C?
A. Soft
B. Fixed C. Incident D. Not enough information
______16. Which of the following will demonstrate the law of superposition?
A.
B.
C.
E. Both A & C
D. Both B & D
______17. What type of wave characteristics is the following picture demonstrating?
A. Diffraction
B. Refraction
C. Reflection
D. Superposition
______18. What property of a wave will not change?
A. Amplitude
B. Wavelength
C. Medium
D. Frequency
______19. What is an oscillator?
A. Generates waves B. Causes interference
C. Involved in superposition
______20. What type of wave characteristics is the following picture demonstrating?
A. Diffraction
B. Refraction
C. Reflection
D. Superposition
______21. What type of wave characteristics is the following picture demonstrating?
A. Diffraction
B. Refraction
C. Reflection
D. Superposition
D.
D. part of a transverse wave
Use this picture to answer questions 22 - 23.
______22. What type of reflection will happen at point B?
A. Superposition
B. Soft
C. Upward
D. Inverted
______23. What will happen to the amplitude as the incident wave moves from the first medium to the second medium?
A. Increase
B. Decrease
C. Stay the same