Consider a two-slit interference experiment like the one shown in figure Q3.7b. The distance between adjacent bright spots in the interference pattern on the screen (A) increases, (B) decreases, or (C) remains the same if, The width of the slits increases
A. increases
B. decreases
C. remains the same
C. remains the same
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What is the sign of these fields’ curl component at point P on each diagram in the direction facing us? (Hint: Draw a cross-sectional view of a small curl-meter centered on the point in question, and sketch the magnetic field vectors at the midpoint of each of the curl-meter’s four sides in the drawing’s plane. Don’t worry about how we might create such a magnetic field.)
A. The component of the curl in this direction is positive.
B. The component of the curl in this direction is negative.
C. The component of the curl in this direction is zero.
A slide projector needs to focus the image of a 24.0-mm × 36.0-mm slide onto a square screen 1.50 m on each side
You want to fill the screen as completely as possible without any of the image falling beyond the screen. Due to space constraints in the projector, the slide must be placed 10.5 cm from the lens. (a) What magnification does the projector produce? (b) How far from the lens should the screen be placed? (c) What focal length projector lens is needed?
A charged particle (m = 5.0 g, q = ?70 ?C) moves horizontally at a constant speed of 30 km/s in a region where the free fall gravitational acceleration is 9.8 m/s2 downward, the electric field is 700 N/C upward, and the magnetic field is perpendicular to the velocity of the particle. What is the magnitude of the magnetic field in this region?
a. 47 mT b. zero c. 23 mT d. 35 mT e. 12 mT
The oldest fossil records date back about
a) 100 years. b) 6 thousand years. c) 2 million years. d) 3500 million years.