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WorksheetsPHYS 122 SL Midterm Review #2
Total questions: 20
Worksheet time: 22mins
A beam of light is shone through a very narrow slit, causing single-slit diffraction. Which of the following statements is true?
All of the fringes will be equal in width
The central maximum will have twice the width as the rest of the fringes
The light is not interfering with itself
The light will be broken up into different colours
None of the above
An incident wave encounters a 0.0003 m thin film, upon a 1 mm thick piece of glass. How much further will the reflected wave travel than the incident wave?
0.0003 m
1 mm
0.0006 m
0.0013 m
The two waves will travel an equal distance
Which of these wavelets would you expect to interfere destructively in single slit diffraction?
i and iii
ii and iv
i and iv
i and v
None of the above
A diffraction gradient is shown below. At which point(s) is the light wave interfering destructively with itself? Select all that apply.
a
b
c
d
e
Two equally charged particles are placed within a parallel plate capacitor. Which charge has a greater speed?
Charge A
Charge B
Both charges have the same speed
A small positive test charge is placed in the center of three charged particles. All of the positive and negative charges are equal in magnitude. Which vector correctly shows the direction of the electric field on the test charge?
E=0
A small positive charge is placed at the black dot. All of the positive and negative charges are equal in magnitude. Which vector correctly shows the net force on the dot?
Fnet = 0
A positive particle has a charge of q and a negative particle has a charge of -2q. They experience an electrostatic force as they are brought closer together. Which of the following statements is true?
The positive charge exerts a greater force on the negative charge
The negative charge exerts a greater force on the positive charge
The two particles exert the same force on one another
The electrostatic force will become stronger as r increases
None of the above
Two subatomic particles are a distance r away from one another and experience an electric force of F1. If the distance between the particles is doubled, how does the new force F2 compare to F1?
F2= F1
F2= 1/2 F1
F2= 2 F1
F2= 1/4 F1
F2= 4 F1
An incident wave travels from air (n = 1) and encounters a new material that has a refractive index of n = 1.3. Which of the following statements is true?
The wavelength is smaller in air than the second material
The reflected wave will experience no phase change
The reflected wave will experience a 𝜆/2 phase change
The reflected wave will experience a π/2 phase change
The reflected wave will experience a π phase change
A tuning fork of frequency 384 Hz is sounded at the same time as a guitar string. Beats are observed; exactly 30 beats are heard in 10.0 s. The frequency of the string in hertz is:
38.4
354 or 414
369 or 399
374 or 394
381 or 387
The figure shows two single slit diffraction patterns. The distance between the slit and the viewing screen is the same in both cases. Which of the following could be true? Select all that apply.
The slits are the same for both, so λ1 > λ2
The slits are the same for both, so λ1 < λ2
The wavelengths are the same for both, so a1 > a2
The wavelengths are the same for both, so a1 < a2
None of these statements can be true
In the figure below the charge in the middle is Q= -3.0 nC. For what charge q1 will charge q2 be in static equilibrium?
12 nC
6.0 nC
3.0 nC
25 nC
1.5 nC
A lab technician uses laser light with a wavelength of 700 nm to test a diffraction grating. When the grating is 40.0 cm from the screen, the first-order maxima appears 7.00 cm from the centre of the pattern. How many lines per millimetre does this grating have?
221 lines
325 lines
108 lines
246 lines
374 lines
Which of the following statements are true? Select all that apply.
If a system is in electrostatic equilibrium no charge is moving.
If a conductor is in electrostatic equilibrium then it is always the case that V=0 inside it.
If a conductor is in electrostatic equilibrium then electric field lines will always intersect its surfaces at right angles.
If a conductor is in electrostatic equilibrium, any free charges have been moved to the edges of the conductor.
A conductor in electrostatic equilibrium must have a net charge of zero.
A clarinet is 60 cm long. It sounds the musical note A3 (220 Hz) when played without fingering. How far from the end of the clarinet should you place your finger (or how much shorter should the tube be) to play the note A5 (880 Hz)?
15.00 cm
25.24 cm
45.00 cm
9.52 cm
3.00 cm
A plastic rod (1) is rubbed with wool, giving it a negative charge, and then brought in contact with an aluminum can. On the left side of the can is another plastic rod (2). Which of the following is correct:
Plastic rod 2 will be strongly attracted to the can and so will deflect to the right.
Plastic rod 2 will be strongly repelled so it will deflect to the left.
Plastic rod 2 will not be attracted or repelled; it will not move.
Plastic rod 2 will be weakly attracted to the can and so will deflect to the right.
Plastic rod 2 will be weakly repelled so it will deflect to the left.
A double slit experiment is first performed with green light, and then with red light. If everything else is kept the same, how does the pattern of fringes on the screen change?
The wavelength of light decreased, so the fringes are closer together.
The wavelength of light increased, so the fringes are closer together.
The wavelength of light decreased, so the fringes are further apart.
The wavelength of light increased, so the fringes are further apart.
The pattern of fringes on the screen does not change.
Shown below is a parallel plate capacitor, and the electric potential at different points in between the plates. At which point would an electron moving between the plates experience the greatest force?
A
B
C
D
The force is the same at all points
Why do noise cancelling headphones have speakers as part of their design?
They produce waves that are in phase with the sounds in the external environment so that they constructively interfere with the incoming sound waves from the surrounding environment to produce a louder sound.
They produce waves that are out of phase with the sounds in the external environment so that they destructively interfere with the incoming sound waves from the surrounding environment to eliminate the sound.
They produce waves that are in phase with the sounds in the external environment so that they destructively interfere with the incoming sound waves from the surrounding environment to produce a louder sound.
They produce waves that are out of phase with the sounds in the external environment so that they constructively interfere with the incoming sound waves from the surrounding environment to eliminate the sound.
They have no function; they just look cooler that way.
