
41 Which circuit diagram shows voltmeter V and ammeter A correctly positioned to
measure the total potential difference of the circuit and the current through each
resistor?


42 A monochromatic ray of light (f=5.09×10^{14} hertz) traveling
in air is incident upon medium A at an angle of 45°. If the angle of refraction
is 29°, medium A could be
(1) water
(2) fused quartz
(3) Lucite
(4) flint glass


43 What is the total electrical energy used by a 1500watt hair dryer operating
for 6.0 minutes?
(1) 4.2 J
(2) 250 J
(3) 9.0 × 10^{3} J
(4) 5.4 × 10^{5} J


44 Which combination of quarks would produce a neutral baryon?
(1) uud
(2) udd
(3) uud
(4) udd


45 A 12.0meter length of copper wire has a resistance of 1.50 ohms.
How long must an aluminum wire with the same crosssectional area be to have the
same resistance?
(1) 7.32 m
(2) 8.00 m
(4) 19.7 m
(3) 12.0 m


46 A 0.500meter length of wire with a crosssectional area of 3.14
× 10^{–6} meters squared is found to have a resistance of 2.53
× 10^{–3} ohms. According to the resistivity chart, the wire could
be made of
(1) aluminum
(2) copper
(3) nichrome
(4) silver


Base your answer to question 47 on the cartoon below and your knowledge of physics.
47 In the cartoon, Einstein is contemplating the equation for the principle that
(1) the fundamental source of all energy is the conversion of mass into energy
(2) energy is emitted or absorbed in discrete packets called photons
(3) mass always travels at the speed of light in a vacuum
(4) the energy of a photon is proportional to its frequency
