Answer the following A. A comet has just passed the Earth and its peak emission is observed at 15000 nm. Determine in which region of the electromagnetic spectrum (e.g. X-ray, infrared, visible, ultraviolet, ...) the peak emission wavelength resides. What is the temperature of the comet? B. Within the Solar System, a convenient unit of measurement is the Earth-Sun distance, called an astronomical unit (AU). For bigger distances, we use the

Answer the following A. A comet has just passed the Earth and its peak emission is observed at 15000 nm. Determine in which region of the electromagnetic spectrum (e.g. X-ray, infrared, visible, ultraviolet, ...) the peak emission wavelength resides. What is the temperature of the comet? B. Within the Solar System, a convenient unit of measurement is the Earth-Sun distance, called an astronomical unit (AU). For bigger distances, we use the

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter7: Work, Energy, And Energy Resources

Section: Chapter Questions

Problem 31PE: Suppose a star 1000 times brighter than our Sun (that is, emitting 1000 times the power) suddenly...

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A perfect black body has its surface temperature 27 cº Determine : Maximum radiation wavelength? Black body radiation intensity? The rate of energy released from 2m² Tungsten wire had its radiating surface area 8mm² and its temperature 2100K, considering that the wire is an ideal black body, Calculate the energy that the wire radiates in 10 minutes. Suppose the surface temperature of the Sun were about 12,000K, rather than 6000K. a. How much more thermal radiation would the Sun emit? b. What would happen to the Sun's wavelength of peak emission? c. Do you think it would still be possible to have life on Earth? Explain /A The energy radiated by a black body at 2300K is found to have the maximum at a wavelength 1260 nm, its emissive power being 8000W/m2. When the body is cooled to a temperature T K, the emissive power is found to decrease to 500W/m2. Find : (i) the temperature T k (ii) the wave length at which intensity of emission in maximum at the Te / Black body becomes yellow with λ…
For the purpose of this exercise, we consider the Earth as a blackbody at a temperature of 300K. a. Assuming that it is spherical with a radius equals to 6370 km, calculate the total amount energy emitted by the Earth (Hint: The total amount of energy emitted by a surface = amount of energy emitted per unit area x area of the surface). b. What wavelength range would you recommend to measure radiation emitted by the Earth using a satellite mounted sensor?
1. What is the wavelength of a radio photon from an AM radio station that broadcasts at 1470 kilohertz? Express your answer to three significant figures and include the appropriate units. 2. What is the energy of a radio photon from the same station? Express your answer to three significant figures and include the appropriate units. For question 1 I am not sure how to solve it because the frequency is in kilohertz and I don't know how to convert it into something that I can use. For the speed of light in this question, would it be best to use 3 x 10^8 m/s or 3 x 10^5 km/s? For question 2 I have the formula to use, I'm just uncertain of how to use it.
2. a) At what wavelength is the peak in the thermal ("blackbody") spectrum of the Sun? What about for the Earth? Make sure you show how you got these numbers, and then b) Give a term for the part of the electromagnetic spectrum in which these peaks occur (e.g., x-ray, UV, Visible, IR, microwave, etc.). c) What is the total flux emitted in each case (in W m ²)?
A photon has an energy of 1.9 meV (milli electron Volt). What is the wavelength of this photon, expressed in micrometers? Keep four significant digits. And the answer is NOT 6.543
This is an infrared thermometer image of a house at night. It can be used to find heat leak in a house. 61 L https://www.digitaltrends.com/home/use-infrared-thermometer-easily-spot-heat-leaks-house/ a. The bright parts are higher temperature than the dark regions. b. The bright parts indicate the emitted E-M radiation with longer wavelength. c. The bright parts indicate high intensity of E-M radiation. d. The bright parts indicate the emitted E-M radiation with high frequency. e. The brightness of image doesn't mean anything.
As2. A planet orbits a red dwarf star of radius r0 at a distance of 120r0. In- telligent beings on this planet observe that the radiation from their star arriving at the top of their atmosphere is 1100W/m2. Assume the star’s radiation follows Planck’s law for black body radiation. a) What is the temperature of the star’s surface, within 10K accuracy? b) What is the color of the star’s light? This would correspond to the frequency at which the function B(ν, T) is maximal.
A photon has an energy of 1.9 meV (milli electron Volt). What is the wavelength of this photon, expressed in micrometers? Keep four significant digits. Would I still use the formula E=hf or do I need to go a different route?
A hydrogen atom, initially at rest, absorbs an ultraviolet photon with a wavelength of λ = 169.8 nm. ▼ Part A What is the atom's final speed if it now emits an identical photon in a direction that is perpendicular to the direction of motion of the original photon? Express your answer to three significant figures and include appropriate units. .0 Value Submit ΜΑ Part B Units Request Answer μA What is the atom's final speed if it now emits an identical photon in a direction that is opposite to the direction of motion of the original photon? Express your answer to three significant figures and include appropriate units. ? Q Search P Pearson Copyright © 2022 Pearson Education Inc. All rights reserved. | Terms of Use | Privacy Policy | Permissions | Contact Us | ט 7:22 12/11/2
1. An incoming light beam has frequency 9.7 x 1014 Hz. (Use h=6.626 x 10-34 J.s) a.) How much energy in Joules does it have? b.) If the photons of this light beam are absorbed by a free electron, how much kinetic energy and speed will the free electron have?
H.M. 1. Calculate the momentum of a visible photon that has a wavelength of 500 nm. 2. Find the velocity of an electron having the same momentum. 3. What is the energy of the electron, and how does it compare with the energy of the photon?
1.1) A star has a radius of three times the Sun's radius, and an average number density of ions a factor of 1.75 higher than that of the Sun. How much time does it take on average for photons to travel across this star compared with the Sun?