Two narrow slits are 0.025 mm apart. When a laser shines on them, bright fringes form on a screen that is a meter away. These fringes are 1.3 cm apart. What is the separation between the m = 2 bright fringe and the central fringe?
a. 2.6 cm
c. 8.6 cm
b. 5.3 cm
d. 6.0 cm
A
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A radar installation operates at 9000 MHz with an antenna (dish) that is 15 meters across. Determine the maximum distance (in kilometers) for which this system can distinguish two aircraft 100 meters apart
a. 7.4 km b. 370 km c. 3700 m d. 37 km e. 740 km
Time Dilation: As measured in Earth's rest frame, a spaceship traveling at 0.9640c takes 10.5 y to travel between two planets that are not moving relative to each other. How long does the trip take as measured by someone on the spaceship?
A. 2.79 y B. 6.82 y C. 39.5 y D. 28.8 y
Dark matter does not affect galaxy collisions
Indicate whether the statement is true or false
Various new quantities are introduced in this chapter, each having associated units. Which of the following quantities is followed by the wrong SI unit for that quantity?
1.resistivity, ?·m 2.temperature coefficient of resistivity, (°C)-1 3.electric power, kWh 4.drift speed, m/s