Modern Physics for Scientists and Engineers
4th Edition
ISBN: 9781133103721
Author: Stephen T. Thornton, Andrew Rex
Publisher: Cengage Learning
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Chapter 4, Problem 7Q
To determine
Using Hg gas in the Franck-Hertz experiment, approximately what range of voltages are expected for the first peak.
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What is the rms speed (Urms) of an He atom at 28C? Solve and explain.
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B. If the ion has this velocity, what is its kinetic energy in eV? (Compare this with typical molecular binding energies of about 5 eV.)
I need some help with the following problem.
1a. What is the maximum number of electrons that can be emitted if a potassium surface of work function 2.40 eV absorbs 5.00 x 10-3 J of radiation at a wavelength of 325 nm?
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Chapter 4 Solutions
Modern Physics for Scientists and Engineers
Ch. 4 - Prob. 1QCh. 4 - Prob. 2QCh. 4 - Prob. 3QCh. 4 - Prob. 4QCh. 4 - Prob. 5QCh. 4 - Prob. 6QCh. 4 - Prob. 7QCh. 4 - Prob. 8QCh. 4 - Prob. 9QCh. 4 - Prob. 10Q
Ch. 4 - Prob. 11QCh. 4 - Prob. 12QCh. 4 - Prob. 13QCh. 4 - Prob. 2PCh. 4 - Prob. 3PCh. 4 - Prob. 4PCh. 4 - Prob. 5PCh. 4 - Prob. 6PCh. 4 - Prob. 7PCh. 4 - What fraction of 5-MeV α particles will be...Ch. 4 - Prob. 9PCh. 4 - Prob. 10PCh. 4 - Prob. 11PCh. 4 - Prob. 12PCh. 4 - Prob. 13PCh. 4 - Prob. 14PCh. 4 - Prob. 15PCh. 4 - Prob. 16PCh. 4 - Prob. 17PCh. 4 - Prob. 18PCh. 4 - Prob. 19PCh. 4 - Prob. 20PCh. 4 - Prob. 21PCh. 4 - Prob. 22PCh. 4 - Prob. 23PCh. 4 - Prob. 24PCh. 4 - Prob. 25PCh. 4 - Prob. 26PCh. 4 - Prob. 27PCh. 4 - Prob. 28PCh. 4 - Prob. 29PCh. 4 - Prob. 30PCh. 4 - Prob. 31PCh. 4 - Prob. 32PCh. 4 - Prob. 33PCh. 4 - Prob. 34PCh. 4 - Prob. 35PCh. 4 - Prob. 36PCh. 4 - Prob. 37PCh. 4 - Prob. 38PCh. 4 - Prob. 39PCh. 4 - Prob. 40PCh. 4 - Prob. 41PCh. 4 - Prob. 42PCh. 4 - Prob. 43PCh. 4 - Prob. 44PCh. 4 - Prob. 45PCh. 4 - Prob. 46PCh. 4 - Prob. 47PCh. 4 - Prob. 48PCh. 4 - Prob. 49PCh. 4 - Prob. 50PCh. 4 - Prob. 51PCh. 4 - Prob. 52PCh. 4 - Prob. 54PCh. 4 - Prob. 55PCh. 4 - Prob. 56PCh. 4 - Prob. 57PCh. 4 - Prob. 59PCh. 4 - Prob. 60PCh. 4 - Prob. 61P
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- First consider some simple electronic partition functions: a. Consider a two-level system of N particles separated by an energy of hv. i. Derive expressions for ē, E, and P, as a function of T. P, is the probability that the system is in the higher energy level. ii. What are the limiting values for each of these at T = 0 and kT » hv. iii. For a level spacing 200 cm what is T when Ē = Nhv. iv. What is P, at the T found in part iii?arrow_forwardConsider the atomic spectra for the H-atom: the Lyman series emits UV photons, the Balmer series emits visible photons, the Paschen series emits IR photons, and the Brackett series emits far IR photons. What type of photons would you expect from the next series? Briefly explain.arrow_forwardA sodium gas is contained in a cubical container (T=250 K) with one side measuring 25.0 m. a.) What is the minimum uncertainty in momentum components of the sodium atoms? b.) What is the minimum uncertainty in velocity components? c.) Find the ratio of uncertainties in your answer in letter b, to the mean speed of an atom in each direction.arrow_forward
- When light of wavelength 310 nm is incident on a metal surface, electrons are ejected with a kinetic energy of 1.0 eV. a. What is the work function (binding energy) of this metal (in eV)? b. What is the cutoff wavelength of light (in nm) that can eject electrons? Will photons with wavelength 544 nm eject electrons? Explain your reasoning. c. Determine the wavelength of light (in nm) that should be used to double the kinetic energy of the electrons ejected from this surface.arrow_forwarda. For the allowed energies of a particle in a box to be large, should the box be very big or very small? Explain.b. Which is likely to have larger values for the allowed energies: an atom in a molecule, an electron in an atom, or a proton in a nucleus? Explain.arrow_forwardWhen Franck–Hertz experiment was conducted on Sodium vapor , the special sodium line emitted with wavelength of 5896 A , If this line represents the transition from first excitement level to ground level. Explain first and last peak places that show in the experiment. Knowing ( sodium Ionization energy is 5.1 ev) ?arrow_forward
- Solve the following, if a television signal (video and audio) has a bandwidth of 4.5MHz, this signal is sampled, quantized, and binary coded to obtain a PCM signal. I. If the signal is to be sampled at a rate 30% above the Nyquist rate, then sampling rate?II. If the samples are quantized into 2048 levels, determine the number of binary pulses required to encode each sample.III. Determine the binary pulse rate (bits per second) of the binary-coded signal.IV. Minimum bandwidth required to transmit this signal. V. Find the channel capacity using Nyquist rule.VI. Find the SNR using Shannon rule.arrow_forwardA physicist is watching a 15-kg orangutan at a zoo swing lazily in a tire at the end of a rope. He (the physicist) notices that each oscillation takes 3.00 s and hypothesizes that the energy is quantized. (a) What is the difference in energy in joules between allowed oscillator states? (b) What is the value of n for a state where the energy is 5.00 J? (c) Can the quantization be observed?arrow_forward(a) If the position of a chlorine ion in a membrane is measured to an accuracy of 1.00 m, what is its minimum uncertainty in velocity, given its mass is 5.8601026 kg? (b) If the ion has this velocity, what is its kinetic energy in eV, and how does this compare with typical molecular binding energies?arrow_forward
- A LiBr molecule oscillates with a frequency of 1.701013 Hz. (a) What is the difference in energy in eV between allowed oscillator states? (b) What is the approximate value of n for a state having an energy of 1.0 eV?arrow_forwardA gas of helium atoms at 273 K is in a cubical container with 25.0 cm on a side. (a) What is the minimum uncertainty in momentum components of helium atoms? (b) What is the minimum uncertainty in velocity components? (c) Find the ratio of the uncertainties in (b) to the mean speed of an atom in each direction.arrow_forward(a) Calculate the velocity of an electron that has a wavelength of 1.00 m. (b) Through what voltage must the electron be accelerated to have this velocity?arrow_forward
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