An Introduction to Thermal Physics
1st Edition
ISBN: 9780201380279
Author: Daniel V. Schroeder
Publisher: Addison Wesley
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter A.1, Problem 1P
(a)
To determine
To Show: The value of
(b)
To determine
To Calculate:The energy of photon with each of different wavelengths.
(c)
To determine
To Calculate: The number of photons emitted in one second.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
What is the wavelength (in m) of a 2.06 eV photon?
Find its frequency in hertz.
Just like the optical part of the spectrum, radio waves can be described in terms of photons - although they can be very difficult to detect. Consider the photons in radio waves from an FM station that has a 88.5-MHz broadcast frequency.
A. Find the energy, in joules, of a photon in the radio waves.
B. Find the energy, in electron volts, of a photon in the radio waves.
Question 2
A center-fed dipole is excited by a current Io =9.3 A. If the dipole is 1.1 cm in
length, determine the maximum radiated power density Smax of the E-M wave of
frequency 490 MHz at a distance of 700 m. Answer to the 4th digit precision after
the decimal place (eg. 1.2345).
Smax
-(μW/m²)
Your Answer:
Answer
Question 3
An antenna with a radiation efficiency of 89.0% has a directivity of 6.0 dB. What is
its gain G in decibels? Answer to the 4th digit precision after the decimal place (eg.
1.2345).
G=
Your Answer:
Answer
dB.
Chapter A Solutions
An Introduction to Thermal Physics
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- (Hand by writing ans.)A certain atom has an energy level of 3.50 eV above the ground state. When excited to this state, it remains 4.0µs, on average, before emitting a photon and returning to the ground state. i) What is the energy of the photon? What is the wavelength of the photon? ii) What is the smallest possible uncertainty in the energy of the photon?arrow_forwardThe half value layer (HVL) of a material is defined as the thickness of the material needed to reduce the intensity of the incident x-ray beam to half its value. Assume that the x-ray beam is monochromatic, no scattering occurs and that material A (as shown in Figure 1) is. homogeneous and has a linear attenuation coefficient (u.). Material A has an HVL of 1.5 mm. Calculate the ratio l/lz as shown in Figure 1 if x-5 mm. lo HA=?? 2x Figure 1: Schematic diagram fr question 3.arrow_forwardX-rays are usually produced by making high-velocity electrons collide with metallic targets. For electrons accelerated in a field of 75,000 volts,a. compute the wavelength (in nm) of the x-rays producedb. if this same kinetic energy is transferred to a proton, how fast would the proton be traveling (in m/s)?arrow_forward
- A student in a physics laboratory observes a hydrogen spectrum with a diffraction grating for the purpose of measuring the wavelengths of the emitted radiation, hr the spectrum, she observes a yellow line and finds its wavelength to be 589 nm. (a) Assuming that this is part of the Balmer series, determine the principal quantum number of the initial state, (b) What is unreasonable about this result? (c) Which assumptions are unreasonable 01 inconsistent?arrow_forward(a) An electron has kinetic energy 4.00 ev. Find its wavelength. 310 Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. m (b) A photon has energy 4.00 ev. Find its wavelength. m Additional Materials еВookarrow_forwardThe photoelectric effect in a cosmic context. Ultraviolet radiation striking dust grains composed of the moon’s dominant rock type, feldspar (with work function 4.5 eV), leaves them with a small electric charge. Smaller grains levitate due to the resulting electrostatic repulsion, giving the surface a diffuse dust halo. 200 nm ultraviolet strikes a dust grain and ejects an electron.What is the electron’s kinetic energy?A. 1.7 eV B. 4.5 eVC. 6.2 eV D. 10.7 eVarrow_forward
- ase T. 7.1.1. How many photons per second are emitted by a 10.0-mW CO2 laser that has a wavelength of 10.6 um?arrow_forwardGamma rays (?-rays) are high-energy photons. In a certain nuclear reaction, a ?-ray of energy 0.836 MeV (million electronvolts) is produced. Compute the frequency of such a photon. How do I enter 2.02*10^20 in the answer window?arrow_forwarda) Problem 9.6 of Textbook: If the spot size at the mirror of a helium-neon laser is 0.5mm, what is the length of the laser cavity? The cavity is of the confocal-type and the wavelength is 633nm. b) For a semiconductor laser diode, the output power is 2mW and 4.5mW when the diode drive (injected) current is 50mA and 55mA, respectively. What is the threshold current (ith) of this laser diode? 4.arrow_forward
- Monochromatic light from a laser shines onto a gold surface and produces photoelectrons with maximum kinetic energy KEmax = 3 eV. What is the wavelength of the laser light? Assume a work function of 5.10 eV for gold.Please give your answer in units of nm, rounded to 1 decimal place. I.e, the answer you should enter should have the form: XX.X nm.arrow_forwardEx3/ For what wavelength of incident photon it shows Compton scattering in which the energy of scattered photon is one-half that of incident photon at a scattering angle of 45°? In what region of the electromagnetic spectrum does such a photon lie? *17. Using branch-current analysis, find the current through each resistor for the network of Fig. 8.119. The resistors are all standard values. 3.3 kN R2 2.2 kN 5.6 kN R3 + E, - 40 V EE 15 V E; 25 V MixGramarrow_forwardd the change in frequency of a photon of red light whose original frequency is 7.3 x10 14 Hz when it falls through 22.5 2.8 Hz.A O 3.8 Hz.B O 1.8 Hz.c O find the changearrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- University Physics Volume 3PhysicsISBN:9781938168185Author:William Moebs, Jeff SannyPublisher:OpenStaxPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
University Physics Volume 3
Physics
ISBN:9781938168185
Author:William Moebs, Jeff Sanny
Publisher:OpenStax
Principles of Physics: A Calculus-Based Text
Physics
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning