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Unformatted text preview: field, as shown
Represents field out of surface + Field 1 Represents field into surface Field 2 +
+ e¯ +
+ e¯ Field 3
e¯ 18. If the electron is deflected downward in each field, then field 1, field 2, and field 3
D. electric, magnetic, and gravitational
gravitational, magnetic, and electric
magnetic, gravitational, and electric
magnetic, electric, and gravitational 12 Use the following information to answer the next question.
Selected Regions of the Electromagnetic Spectrum
visible light When the regions of the electromagnetic spectrum listed above are arranged in
order of increasing wavelength, this order is
D. III, I, V, II, IV
II, I, V, IV, III
III, IV, V, I, II
IV, V, III, I, II Use the following diagram to answer the next question. µN - (C ( The Electric Field Component of an Electromagnetic Wave in a Vacuum 20. J (10- s)
1 3 5 The wavelength of this electromagnetic wave is
A. 6.0 × 102 m B. 1.2 × 103 m C. 2.5 × 105 m D. 7.5 × 1013 m 13 7 Use the following information to answer the next three questions.
A fluorescent tube operates by exciting mercury atoms from their ground state
to an excited state. The return of the atoms to a lower energy level results in
the emission of electromagnetic radiation that cannot be seen.
Through a process called fluorescence, a phosphor powder coating on the
inside of the glass tube converts the radiation emitted by the mercury atoms
into electromagnetic radiation that can be seen.
A fluorescent light fixture draws 80.0 W of electrical power when connected
to a 110 V AC power supply.
6. The mercury atoms emit electromagnetic radiation with a wavelength of 254 nm.
The minimum amount of energy that must be transferred to a mercury atom during
excitation to enable this emission, expressed in scientific notation, is b × 10–w J.
The value of b is __________.
(Record your three-digit answer in the numerical-response section on the answer sheet.) 21. The electromagnetic radiation emitted by the mercury atoms cannot be seen
because it is
D. 22. in the ultraviolet region
of too low an intensity
in the infrared region
of too slow a speed In a circuit protected by a 15.0 A circuit breaker, the maximum number of
fluorescent light fixtures that can be connected in parallel is
14 23. The threshold frequency of light for the emission of photoelectrons from a metal
is 4.4 × 1014 Hz. If light of frequency 6.6 × 1014 Hz shines on the metal, then
the maximum kinetic energy of the emitted photoelectrons is
B. 4.4 × 10–19 J C. 2.9 × 10–19 J D. 24. 7.3 × 10–19 J 1.5 × 10–19 J J. J. Thomson’s experiments indicated that cathode rays are
D. 25. photons
positively charged particles
negatively charged particles The highest X-ray frequency that can be produced by an X-ray tube operating
at 6.5 × 104 V is
A. 6.4 × 10–20 Hz B. 1....
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- Fall '09