Exam (elaborations)

FINAL EXAM CHM 151 RIO SOLADO M.SCHAAB Q&A Guaranteed Success

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CHM

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CHM

peed of light - waves can travel through a vacuum at a constant speed of 2.998 ×× 10^8 m/s, (denoted by c). amplitude - extent of the displacement caused by a wave (for sinusoidal waves, it is one-half the difference from the peak height to the trough depth, and the intensity is proportional...

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FINAL EXAM CHM 151 RIO SOLADO

M.SCHAAB Q&A Guaranteed Success

wave - ✔✔oscillation that can transport energy from one point to another in

space

wavelength (λ) - ✔✔distance between two consecutive peaks or troughs in

a wave

the speed of light - ✔✔waves can travel through a vacuum at a constant

speed of 2.998 ××

10^8 m/s, (denoted by c).

amplitude - ✔✔extent of the displacement caused by a wave (for sinusoidal

waves, it is one-half the difference from the peak height to the trough

depth, and the intensity is proportional to the square)

blackbody - ✔✔Idealized perfect absorber of all incident electromagnetic

radiation; such bodies emit electromagnetic radiation in characteristic

continuous spectra

continuous spectrum - ✔✔electromagnetic radiation given off in an

unbroken series of wavelengths (e.g., white light from the sun)

,electromagnetic radiation - ✔✔energy transmitted by waves that have an

electric-field component and a magnetic-field component

electromagnetic spectrum - ✔✔range of energies that electromagnetic

radiation can comprise, including radio, microwaves, infrared, visible,

ultraviolet, X-rays, and gamma rays; can be specified in wavelengths and

frequencies

frequency (ν) - ✔✔number of wave cycles (peaks or troughs) that pass a

specified point in space per unit time

hertz (Hz) - ✔✔the unit of frequency, which is the number of cycles per

second, s−1

intensity - ✔✔property of wave-propagated energy related to the amplitude

of the wave, such as brightness of light or loudness of sound

interference pattern - ✔✔pattern typically consisting of alternating bright

and dark fringes; it results from constructive and destructive interference of

waves

line spectrum - ✔✔electromagnetic radiation emitted at discrete

wavelengths by a specific atom (or atoms) in an excited state

node - ✔✔any point of a standing wave with zero amplitude

,photon - ✔✔smallest possible packet of electromagnetic radiation, a

particle of light

quantization - ✔✔occurring only in specific discrete values, not continuous

standing wave - ✔✔localized wave phenomenon characterized by discrete

wavelengths determined by the boundary conditions used to generate the

waves; standing waves are inherently quantized

wave particle duality - ✔✔elementary particles including matter exhibit

properties of both particles (including localized position, momentum) and

waves (including nonlocalization, wavelength, frequency)

The spectrum consists of colored lines, at least one of which (probably the

brightest) is red. - ✔✔The light produced by a red neon sign is due to the

emission of light by excited neon atoms. Qualitatively describe the

spectrum produced by passing light from a neon lamp through a prism.

c = λν - ✔✔speed of light = wavelength x frequency

E = hv - ✔✔E is energy of a photon

h is planks constant = 6.626 × 10^−34 J s

v is frequency (s^-1 or Hz)

, FM-95, an FM radio station, broadcasts at a frequency of 9.51 × 10^7 s−1

(95.1 MHz). What is the wavelength of these radio waves in meters? -

✔✔3.00 x 10^8 m/s = λ(9.51 x 10^7 m -1)

λ = 3.00 x 10^8 m/s / 9.51 x 10^7 m -1

λ = 3.15 meters

Light with a wavelength of 614.5 nm looks orange. What is the energy, in

joules, per photon of this orange light? What is the energy in eV (1 eV =

1.602 × 10^−19 J)? - ✔✔Using a combo of C=λv and E=hv

3.00 x 10^8 m/s = 6.145 x 10^-7m/s (h)

3.00 x 10^8 m/s / 6.145 x 10^-7 = 4.9 x 10^14 s -1

Planks constant (6.63 x 10^-34)x (4.9 x 10^14) = 3.24 x 10^-19 Joules or

2.018 eV

Bohr's model of the hydrogen atom - ✔✔structural model in which an

electron moves around the nucleus only in circular orbits, each with a

specific allowed radius; the orbiting electron does not normally emit

electromagnetic radiation, but does so when changing from one orbit to

another.

excited state - ✔✔state having an energy greater than the ground-state

energy

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FINAL EXAM CHM 151 RIO SOLADO M.SCHAAB Q&A Guaranteed Success

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