Spectral Series: What is the longest wavelength in the Paschen series?
A. 2.01 nm
B. 2.01 ?m
C. 365 nm
D. 1.88 nm
E. 1.88 ?m
Answer: E
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A converging lens with two convex surfaces has a front surface with radius of curvature of 13.1 cm; the back surface has radius of curvature of 16.5 cm, and it is made from material with an index of refraction of 2.10 . What is the focal length of the lens?
a. 6.64 cm b. 57.8 cm c. ?57.8 cm d. 3.48 cm e. 30.3 cm
The mass of Mars, 6.40 × 1023 kg, is about one-tenth that of Earth, and its radius, 3395 km, is about half that of Earth. What is the mean density (mass divided by volume) of Mars in kilograms per cubic meter?
A) 9.76 × 102 kg/m3 B) 1.95 × 103 kg/m3 C) 3.90 × 103 kg/m3 D) 7.81 × 103 kg/m3
Stars in the same constellation
a. probably formed at the same time. b. must be part of the same cluster of stars in space. c. must have been discovered at about the same time at the same location in space. d. may actually be very different distances away from the observer and from each other.
A 3.00-m rod is pivoted about its left end. A force of 7.80 N is applied perpendicular to the rod at a distance of 1.60 m from the pivot causing a ccw torque, and a force of 2.60 N is applied at the end of the rod 3.00 m from the pivot. The 2.60-N force is at an angle of 30.0o to the rod and causes a cw torque. What is the net torque about the pivot? (Take ccw as positive.)
a. 16.4 N·m b. –8.58 N·m c. 8.58 N·m d. –16.4 N·m e. 4.68 N·m