When an electron jumps from an orbit where n = 4 to one where n = 3
A) a photon is emitted.
B) a photon is absorbed.
C) two photons are emitted.
D) two photons are absorbed.
A
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A dentist uses a concave mirror (focal length 2 cm) to examine some teeth. If the distance from the object to the mirror is 1 cm, what is the magnification of the tooth?
A. 6 B. 1 C. 4 D. 2 E. 1.5
What is the resistance of a wire made of a material with a resistivity of 3.2 × 10^?8 ? / m if its length is 2.5 m and its diameter is 0.50 mm?
a. 0.16 ? b. 0.10 ? c. 1.28 ? d. 0.41 ? e. 0.81 ?
A airplane that is flying level needs to accelerate from a speed of 2.00 × 102 m/s to a speed of 2.40 × 102 m/s while it flies a distance of 1.20 km. What must be the acceleration of the plane?
A) 4.44 m/s2 B) 2.45 m/s2 C) 7.33 m/s2 D) 5.78 m/s2 E) 1.34 m/s2
Heat is thermal energy that flows from
A) hot to cold. B) high energy to low energy. C) high thermal pressure to low thermal pressure. D) all of the above