An 8.00-mW laser beam emits a cylindrical beam of single-wavelength sinusoidal light 0.600 mm in diameter. What is the maximum value of the magnetic field in the laser beam?
(?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.0 × 108 m/s)
A) 20.5 µT B) 17.2 µT C) 12.4 µT D) 15.4 µT E) 9.24 µT
D
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A light woman and a heavy man jump from an airplane at the same time and open their same-size parachutes at the same time. Which person will get to the ground first?
A) The light woman B) The heavy man C) Both should arrive at the same time. D) not enough information
A juggler throws two balls up to the same height so that they pass each other halfway up when A is rising and B is descending. Ignore air resistance and buoyant forces. Which statement is true of the two balls at that point?
a. There is an residual upward force from the hand on each ball. b. There is a greater residual force from the hand on A than there is on B. c. Only gravity acts on B but there is an additional residual force from the hand on A. d. There is an additional downwards force besides gravity on each ball. e. The only force acting on each ball is the gravitational force.
What power lens is needed to correct for farsightedness where the uncorrected near point is 75 cm?
A) -2.67 D B) +2.67 D C) +5.33 D D) -5.33 D E) +1.00 D
A double slit that is illuminated with coherent light of wavelength 644 nm produces a pattern of bright and dark fringes on a screen 6.00 cm from the slits
If the slits are 2783 nm apart, what is the distance on the screen between the 4th and the 2nd bright fringes on one side of the central maximum? A) 23.0 cm B) 17.6 cm C) 11.5 cm D) 3.13 cm E) 14.7 cm