Concept explainers
(a)
Interpretation:
The wavelength of maximum emission of a tungsten filament bulb at 2870 K and 3750 K needs to be calculated.
Introduction:
The Wein’s displacement Law states that the maximum wavelength in micrometers for the radiations of the blackbody is represented as follows:
Here, T is defined as the temperature in Kelvin as it is absolute temperature.
Stefan’s law states that the total quantity of heat energy released per second per unit area by a perfect blackbody is directly proportional/related to the fourth power of the absolute temperature of its surface given by the equation:
Et = aT4
Where a has a value of
(b)
Interpretation:
The total energy output of the bulb in terms of W/m3 needs to be determined.
Concept introduction:
The Wein’s displacement Law states that the maximum wavelength in micrometers for the radiations of the blackbody is represented as follows:
Here, T is defined as the temperature in Kelvin as it is absolute temperature.
Stefan’s law states that the total quantity of heat energy released per second per unit area by a perfect black body is directly proportional/related to the fourth power of the absolute temperature of its surface given by the equation:
Et = aT4
Where a has a value of
Trending nowThis is a popular solution!
Chapter 7 Solutions
Principles of Instrumental Analysis
- Describe the differences and similarities between spontaneous and stimulated emission.arrow_forwardWhat is the modulated wavelength of mercury vapor light at a temperature of 88°F and barometric pressure of 725 mmHg, known that the frequency of modulation is 30 MHz?arrow_forwardDescribe how the attenuation of X-rays correlate with i) their photon energy, ii) the chemical make-up of the transmission material, and iii) the distance they have travelled through the material.arrow_forward
- The frequency of broadcast for a blootooth device is 2483.5 MHz. a.) what is the wavelength of this beam in mm? b.) what is the energy associated with a photon of radiation?arrow_forwardOn the Moon’s surface, lunar astronauts placed a corner reflector, off which a laser beam is periodically reflected. The distance to the Moon is calculated from the round-trip time. What percent correction is needed to account for the delay in time due to the slowing of light in Earth’s atmosphere? Assume the distance to the Moon is precisely 3.84×108 m , and Earth’s atmosphere (which varies in density with altitude) is equivalent to a layer 30.0 km thick with a constant index of refraction n = 1.000293.arrow_forwardusing the following information to construct a valid hypothesis addressing the effect of pH and temperature on the hydrolysis of starch. Per bench, prepare the stock amylase enzyme solution by adding distilled water to the powdered enzyme in the flask , each bench will share one flaks of enzyme solution. per groups, turn on the spectrometer and set the wavelength to 560nm.allow the instruments to warm up for at least 10 minutes. per group, set up 17 cuvettes in a Styrofoam rack. Add 3 drops of iodine (IKI) to each coveter. per group, prepare the “black” cuvette by rapidly adding 3 mL of maltose standard solution to one of The prepared cuvettes containing IKI. Rapid addition of the maltose will mix the maltose and IKIarrow_forward
- 1. Draw simple atomic energy level diagrams showing the following processes: Atomic Absorption Atomic Emission Atomic Fluorescence 2. Explain what a nebulizer is and what it does. 3. Why is an inductively-coupled plasma generally a better tool for atomic emission than a flame?arrow_forwardWhat is the kinetic energy of an electron that has been accelerated through a potential difference of 10.0 kV?arrow_forwardSuppose that you designed a spacecraft to work by photon pressure. The sai l was a completely absorbing fabric of area 1.0 km2 and you directed a red laser beam of wavelength 650 nm on to it from a base on the Moon. What is (a) the force, (b) the pressure exerted by the rad iation on the sa il? (c)Suppose the mass of the spacecraft was 1.0 kg. Given that, after a period of acceleration from standstil l, speed= (force/mass) x time, how long would it take for the craft to accelerate to a speed of 1.0 m s-1?arrow_forward
- Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage LearningPrinciples of Modern ChemistryChemistryISBN:9781305079113Author:David W. Oxtoby, H. Pat Gillis, Laurie J. ButlerPublisher:Cengage Learning