University Physics with Modern Physics (14th Edition)
14th Edition
ISBN: 9780321973610
Author: Hugh D. Young, Roger A. Freedman
Publisher: PEARSON
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Chapter 39, Problem 39.18E
To determine
The wavelength of the photon.
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In the Star Trek unaversive there is a creature called a Horta. The Horta is silicon-based life form and would have a bond strength of 3.80 eV. What wavelength of photon would you need in a phasor weapon to destroy the Horta?
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QUESTION 9
A photon energy E = 10 MeV incident on a detector is distributed in the direction forming an angle of 60 degrees from its
initial direction with energy E' equal to
O A. 11.4 MeV
О В. 10 МeV
O C. 9.99 MeV
O D. 10.1 MeV
O E. 9.88 MeV
QUESTION 10
13
10
00
A HeNe laser generates laser light with an output of 2.00mW and a wavelength of 632.8nm.
a) how many photons do the larsen leave every second?
b) if the laser beam illuminates an aluminum surface for one minute, which is the maximum number of electrons that can be released during that minute.
c) what wavelength would the laser light need to have in order for the shortest de Broglie wavelength of the released electrons to be 548 pm
d) if light with the wavelength you calculated in problem c) would illuminate a golden white instead, would you then expect released electrons with a shorter de Broglie wavelength than that in problem c)? Motivate your answer
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- (a) What is the momentum of a 0.0100-nm-wavelength photon that could detect details of an atom? (b) What is its energy in MeV?arrow_forwardCT scanners do not detect details smaller than about 0.5 Is this limitation clue to the wavelength of x lays? Explain.arrow_forwardQ1/ A CRT has an effective length of 4 Cm and distance between the plates of 3 mm. The screen has 45 Cm away from the center of plates. The electron beam enters the plates at velocity of 25 10 m/s. The deflection factor has 300 V/m. the intensity field is 3 KV/m. If the electron mass and charge are 9.1 10-31 Kg and 1.6 10-19 C. Determine- 1- The vertical deflection. (y). 2- The angular deflection. (o). 3- Find The coordinates of the point at which the election beam leaves the plates P (x, y). 4- Where should be the screen placed in order to obtain the deflection on the screen. (D-2cm). 5- What the time taken by the electron in its travel between entering the plates and reaching the screen.arrow_forward
- lmagine an alternate universe where the mass of the electron is 2.4 times larger than in our universe.Assuming that none of the other properties of the universe are changed, what would be the wavelength of the first line (the line with the longest wavelength)in the Lyman series of the hydrogen atom? Give your answer in nm.arrow_forwardYour answer is partially correct. A laser emits light at wavelength A = 598 nm in a beam of diameter 3.7 mm and at an energy-emission rate of 5.5 mW. A detector in the beam's path absorbs the beam. At what rate per unit area does the detector absorb photons? Number 1.429048888 Units photons/s-m^2arrow_forwardI3 A stabilized He-Ne laser operates at a wavelength of λ=632.8 nm and has a bandwidth of Δν=1 kHz. The total power of the light beam is 1mW and the diameter of the beam is 1mm. A) Determine the irradiance of the laser and the number of photons emitted per unit of time B) What should be the temperature of a black body so that it emits the same number of photons, in the same area and in the same frequency range as the laser?arrow_forward
- A boy walks in the evening in the park with a flashlight with a power of 25 W . The flashlight bulb is monochromatic and emits photons with a wavelength of 490 nm . How many photons per second are emitted by the flashlight? To complete the first step, calculate the energy Ep of one photon emitted by the flashlight. If you stand 17 mm from this bulb, how many photons enter each of your eyes per second? Assume your pupil is 5.0 mmmm in diameter and that the bulb radiates uniformly in all directions.arrow_forwardExposure to a sufficient quantity of ultraviolet light will redden the skin, producing erythema—a sunburn. The amount of exposure necessary to produce this reddening depends on the wavelength. For a 1.0 cm2 patch of skin, 3.7 mJ of ultraviolet light at a wavelength of 254 nm will produce reddening; at 300 nm wavelength, 13 mJ are required.a. What is the photon energy corresponding to each of these wavelengths?b. How many total photons does each of these exposures correspond to?c. Explain why there is a difference in the number of photons needed to provoke a response in the two cases.arrow_forwardThe most common fluorescent lightbulbconverts ultraviolet light from mercury atoms to white light. If anultraviolet photon of wavelength 185 nm is emitted by a mercuryatom and absorbed by the phosphor, what is the maximum number of red 655-nm photons that the phosphor can emit?arrow_forward
- You are studying a very distant quasar and are trying to determine how far away it is. The quasar is a very bright point-like light source, and there is only one relevant distance measuring technique applicable to objects at such a great distance. From a spectra of the quasar, you observe that it's Lyman alpha emission line (which would be at 121.6 nm in a laboratory sample of Hydrogen) is at 130 nm. What is the distance to this quasar in units of Mpc. [Hint: Think about what distance measuring technique we use for the very farthest objects in the universe. You will need to look up a special constant (who's value is uncertain) to complete this problem. The answer accounts for the possible range of uncertainty in the quantity you need to look up.]arrow_forwardAssuming that 10.0% of a 100 W light bulb's energy output is in the visible range (typical for incandescent bulbs) with an average wavelength of 580 nm, and that the photons spread out uniformly and are not absorbed by the atmosphere, how far away (in km) would you be if 446 photons per second enter the 3.10 mm diameter pupil of your eye? (This number easily stimulates the retina.) 198 kmarrow_forwarda) What is the momentum of a 0.0055 -nm wavelength photon that could detect details of an atom? 0.120 x10 -23 kg · m/sarrow_forward
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