Which cones on the eye are most sensitive to light?
A) red
B) infrared
C) green
D) UV
E) blue
C
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Each of the following describes an "Atom 1" and an "Atom 2." In which case are the two atoms different isotopes of the same element?
A) Atom 1: nucleus with seven protons and eight neutrons, surrounded by seven electrons Atom 2: nucleus with seven protons and seven neutrons, surrounded by seven electrons B) Atom 1: nucleus with six protons and eight neutrons, surrounded by six electrons Atom 2: nucleus with seven protons and eight neutrons, surrounded by seven electrons C) Atom 1: nucleus with eight protons and eight neutrons, surrounded by eight electrons Atom 2: nucleus with eight protons and eight neutrons, surrounded by seven electrons D) Atom 1: nucleus with four protons and five neutrons, surrounded by four electrons Atom 2: nucleus with five protons and five neutrons, surrounded by four electrons
A laser pulse of duration 25 ms has a total energy of 1.4 J. If the wavelength of this radiation is 567 nm, how many photons are emitted in one pulse? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 4.8 × 1019 B) 3.2 × 1017 C) 9.9 × 1019 D) 4.0 × 1018 E) 1.6 × 1017
If an astronaut takes an object to the moon the following is true (choose only one)
A. both the mass and the weight of the object will change. B. both the mass and the weight of the object will be the same. C. the weight will change but the mass will be the same. D. the mass will change but the weight will be the same.
A metal bar is 20 cm long and has a rectangular cross-section measuring 1.0 cm × 2.0 cm. What is the voltage drop along its length when it carries a 4000-A current? The resistivity of the metal is 1.68 × 10-8 ? ? m
A) 0.067 V B) 0.67 V C) 0.034 V D) 0.34 V