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Concept explainers
The current that flows through a battery-powered flashlight, solar cells and fuel cells is called ____.
A. AC B. DC C. LC D. RC
A beam of white light goes from air into the water droplet at an incidence angle of 36.2 degrees. What is the angle
between the red (660 nm) and violet (410 nm) parts of the refracted light?
A. 20O B. 21O C. 22O D. 23O
A magnetic field B= 0.6T is directed upward through a circular loop of diameter 7 cm and 500 turns. The loop is initially
horizontal, so it is perpendicular to the magnetic field. It rotates through a horizontal axis so that the plane of the loop
is at 74° with the horizontal axis within 1 second. What is the magnitude of the induced emf?
A. -18.18 V B. -15.3 V C. 16.4 V D. 17.6 V
A electron passes through a magnetic field at 60 to the field at a velocity of 3.5 × 106?/?. What is the magnitude of
the force acting on the electron having a 0.45 T magnetic field?
A. 2. 18 × 10−10 ? C. 2. 18 × 10−12 ?
B. 2. 18 × 10−11 ? D. 2. 18 × 10−13 ?
A wire that is 2.00 m long and carrying a current of 15.0 A is at 90 to a uniform magnetic field. The force acting on
the wire is 0.70 N. What is the strength of the magnetic field?
A. 0.01 T B. 0.02 T C. 0.03 T D. 0.04 T
Which of the following statements BEST describes the difference between electric and magnetic fields?
I. An electric field is essentially a force field that’s created around an electrically charged particle. A magnetic
field is one that’s created around a permanent magnetic substance or a moving electrically charged object.
II. The strength of the magnetic field is represented by either gauss or Tesla. The strength of an electric field is
represented by Newton per Coulomb or Volts per Meter
III. Magnetic fields are created whenever there is a flow of
voltage is present
A. I and II B. II and III C. I, II, and III D. I and III
Compute the resistance of a hardened copper rod 2 meters long and 8 mm in diameter if the resistivity of the material
is 1.756 x 10-8 ohm-meter.
A. 1.69 x 10-4 Ω.m B. 6.19 x 10-4 Ω.m C. 8.61 x 10-4 Ω.m D. 9.18 x 10-4 Ω.m
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- 1. Horizontally polarized light is incident on a polarizing filter with an axis of polarization that makes an angle of 32° with the vertical. a. What percentage of the incident light is blocked by the polarizer? b. What angle should the polarizer make with the vertical to block exactly half of the incident light?arrow_forwardWhich of the following is TRUE regarding reflection and refraction? a. Reflection can be explained by the particle nature of light while refraction cannot. b. Refraction can be explained by the wave nature of light while reflection cannot. c. Reflection and refraction can be explained by both the wave and particle nature of light. d. Reflection and refraction can only be explained by the wave nature of light. The perception of color does not correspond to a unique set of wavelengths. The human eye distinguishes several hundreds of colors and shades. The eye has only three separate types of visual signals. So the different signal perceptions of colors are combinations of these three visual signals. Perception of colors depends upon the relative stimulation of the three color sensitive cells in the retina of the eye. What are the requirements for perceiving colors? a. Eye and light b. Eye, object, and light c. Eye, light, and shadow d. Eye, light, and mediumarrow_forwardUnpolarized light with an initial intensity of 32 W/m2 is incident on a perfect polarizing material that allows light through with a vertical orientation. The light then passes through a second polarizer that is rotated 450 with respect to the first. Finally, the light passes through a third polarizer that is oriented at 900 with respect to the first. What is the intensity of light that makes it through the first polarizer? A. 0 What is the intensity of light that makes it through the second polarizer? B. 2 W/m2 |What is the intensity of light that makes it through all three polarizers? C. 4 W/m2 D. 8 W/m2 E. 16 W/m2 F. 32 W/m2arrow_forward
- A beam of red light and a beam of blue light pass from air into water. Which statement is true?a. The red-light beam travels faster than the blue light in both media.b. The blue light beam travels faster than the red light in both media.c. Both beams travel at the same speed as each other, and at the same speed in water and air.d. Both beams travel at the same speed as each other, and faster in water than in air.e. Both beams travel at the same speed as each other, and slower in water than in air.arrow_forwardA 6.0 mW vertically polarized laser beam passes through a polarizing filter whose axis is 75° from vertical. What is the laser-beam power after passing through the filter?A. 0.40 mW B. 1.0 mWC. 1.6 mW D. 5.6 mWarrow_forwardYou are in a room lit only by blue light. A chair in that room looks black to you. (Your eyes see red + green light as yellow; your eyes see red+ blue light as magenta; your eyes see green and blue light as cyan) a. What colors of light is the chair reflecting in the blue room? What colors of light is the chair absorbing in that room? Explain. b. You then move the chair out into the sunlight. What possible colors could the chair be in the sunlight? Explain.arrow_forward
- QUESTION 2 Which of the following parts of the eye contains the photoreceptor cells commonly called the "rod" and "cones"? a. The optic nerve b. The fovea O c. The vitreous humour O d. The cornea e. The lens QUESTION 3 The time-averaged intensity of sunlight that is incident at the upper atmosphere of the earth is 1,380 watts/m². What is the maximum value of the electric field at this location? O a. 1,200 N/C b. 1,020 N/C C. 1,950 watts/m² d. 660 N/C O e. 840 N/Carrow_forwardIf the amplitude of an EM wave propagating through an unknown medium or substance is 2π N/C electric field and π x 10-8 T for magnetic field, what is the index of refraction of the aid medium? a. π b. 3 c. 5 d. 2/3 e. 3/2arrow_forwardAn observer at a fixed distance from a light bulb measures the light intensity at her location to be 10 watts/m2. What is the maximum value of the electric field strength at the observer's location? a. 87 N/C b. 61 N/C c. 48 N/C d. 74 N/C e. 100 N/Carrow_forward
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