PHYSICS F/SCI.+ENGR.,V.1 (CHAP.1-20)
5th Edition
ISBN: 9780134378053
Author: GIANCOLI
Publisher: RENT PEARS
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Chapter 37, Problem 4Q
To determine
Red bulb work in a dark room for developing black and white film and will it work for the color photographs.
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Darkrooms for developing black-and-white film weresometimes lit by a red bulb. Why red? Explain if such abulb would work in a darkroom for developing color film.
An unknown element is used as a target in an x-ray tube. Measurements show that the characteristic spectral lines with the longest wavelengths are 0.155 nm and 0.131 nm. What is the element.
Problem 30.66 - Enhanced - with Expanded Hints
A beam of neutrons with a de Broglie wavelength of 0.240 nm diffracts from a crystal of table
salt, which has an interionic spacing of 0.282 nm
Part A
What is the speed of the neutrons?
Express your answer in kilometers per second.
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x |X| X.10n
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You may have confused the mass of an electron with the mass of a neutron. Recall that the mass of a neutron is equal to 1.675 × 10-27 kg.
Chapter 37 Solutions
PHYSICS F/SCI.+ENGR.,V.1 (CHAP.1-20)
Ch. 37 - Prob. 1QCh. 37 - Prob. 2QCh. 37 - Prob. 3QCh. 37 - Prob. 4QCh. 37 - Prob. 5QCh. 37 - Prob. 6QCh. 37 - Prob. 7QCh. 37 - Prob. 8QCh. 37 - Prob. 9QCh. 37 - Prob. 10Q
Ch. 37 - Prob. 11QCh. 37 - Prob. 12QCh. 37 - Prob. 13QCh. 37 - Prob. 14QCh. 37 - Prob. 15QCh. 37 - Prob. 16QCh. 37 - Prob. 17QCh. 37 - Prob. 18QCh. 37 - Prob. 19QCh. 37 - Prob. 20QCh. 37 - Prob. 1PCh. 37 - Prob. 3PCh. 37 - Prob. 7PCh. 37 - Prob. 9PCh. 37 - Prob. 13PCh. 37 - Prob. 25PCh. 37 - Prob. 26PCh. 37 - Prob. 27PCh. 37 - Prob. 32PCh. 37 - Prob. 34PCh. 37 - Prob. 37PCh. 37 - Prob. 45PCh. 37 - Prob. 52PCh. 37 - Prob. 76GPCh. 37 - Prob. 77GP
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- -27 (c) i. A thermal neutron has an energy of E= 0.025 eV and a mass of 1.675 x 107 kg. Calculate the de Broglie wavelength of a thermal neutron. ii. On the basis of this result, explain whether it is possible to observe diffraction effects when the neutron is scattered by a cobalt crystal. Suggest a reason why performing neutron diffraction experiments is challenging.arrow_forward137. A laser with a power output of 2.00 mW at a 400-nm wavelength is used to project a beam of light onto a calcium photoelectrode. (a) How many photoelectrons leave the calcium surface per second? (b) What power is carried away by ejected photoelectrons, given that the work function of calcium is 2.31 eV? (c) Calculate the photocurrent. (d) If the photoelectrode suddenly becomes electrically insulated and the setup of two electrodes in the circuit suddenly starts to act like a 2.00-pF capacitor, how long will current flow before the capacitor voltage stops it?arrow_forward7. Resolving ‘power’ of an electron microscope versus optical (photon) microscope: If a resolution of 1.0 x 10-11m (0.010nm) is required to ‘see’ an atom (a) If electrons are used (emicroscope), what minimum kinetic energy of the electrons is required? Use deBroglie’s Hypothesis and KE = p2 /2me and non-relativistic velocities: (b) If photons are used, what minimum KE (Eγ) is required to obtain 10-11m resolution?arrow_forward
- Why must engineers and scientists shield against x-ray production in high-voltage equipment?arrow_forwardIn an x-ray tube, if the energy with which the electrons strike the metal target is increased, the wavelengths of the characteristic x-rays do not change. Why not?arrow_forward11B). Photons with energy of 2.35 eV are used in a photoelectric effect experiment. The binding energy of the material used is 1.85 eV. What is the de Broglie wavelength of the ejected electrons?arrow_forward
- 3. A 6-stage photomultiplier tube has a dark current of 2 nA. The secondary emission ratio of each dynode is 10 and the external quantum efficiency of the photocathode is 0.4. (1) The electrons produced by the photocathode every second as the background noise. (2) The minimum detectable optical power for 600-nm light if the signal-to-noise ratio is 1.earrow_forward1.4 A radiation with a frequency of 3.13 x10¹5 Hz releases an electron from a copper plate. The kinetic energy of the electron is 2.00 x10-¹7 J. NB: Planck's constant, h = 6.63 x 10-34 Js. (1) (ii) Calculate the work function of the plate. Calculate the energy of a photon with a frequency of 5.4 x 10¹4 Hz. 1.5 The intensity of x-ray beam passing through a material decreases exponentially. 1)arrow_forward1. Suppose that light of total intensity 1.0 W/cm2 falls on a clean iron sample 1.0 cm2 in area. Assume that the iron sample reflects 96% of the light and that only 3.0% of the absorbed energy lies in the violet region of the spectrum above the threshold frequency.(a) What intensity is actually available for the photoelectric effect?(b) Assuming that all the photons in the violet region have an effective wavelength of 250nm, how many electrons will be emitted per second?(c) Calculate the current in the phototube in amperes.(d) If the cutoff frequency is ?0 = 1.1 1015 Hz, find the work function, ?, for iron(e) Find the stopping voltage for iron if photoelectrons are produced by light with 250 nm. 2. (a) Show that the spread of velocities caused by the uncertainty principle does not have measurable consequences for macroscopic objects (objects that are large compared with atoms) by considering a 100-g racquetball confined to a room 15 m on a side. Assume the ball is moving at 2.0 m/s…arrow_forward
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