The surface temperature of the naked-eye star Capella (in constellation Auriga) is approximately 4,700 degrees Celsius. a) What is the peak frequency (in hertz) and wavelength (in metres AND nanometres) of Capella’s emitted light? b) If you were to look at Capella in the night sky, what colour would you expect it to appear? Why would you expect this colour?

The surface temperature of the naked-eye star Capella (in constellation Auriga) is approximately 4,700 degrees Celsius. a) What is the peak frequency (in hertz) and wavelength (in metres AND nanometres) of Capella’s emitted light? b) If you were to look at Capella in the night sky, what colour would you expect it to appear? Why would you expect this colour?

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...

See similar textbooks

Similar questions

Paragraph Styles 1. When you see an object, you're either seeing the light it made/created by itself, or the light that bounced off of it (reflected) that came from somewhere else. a) List some examples of objects that make their own light in the room you're in. List what color of light you see for each object. b) List some examples of objects that you see because they reflect light in your room. List the colors of light that you see for each object. c) For each example for part b: where is the light that reflects originally coming from? DFocus De Insert PrtSc F11 F12 F9 F10 F7 F8 F4 F5 F6 Ba & 8. 9. 5
Other things being equal, what would the earth's average temperature have been historically (before the Industrial Revolution) if it reflected only 24% of the light from the sun instead of 30%? The earth's average temperature would be K. xt > Mc Graw Hill < Prev 4 of 15 MacBook Pro esc G Search or type URL ! 23 2$ & 1 2 3 4 6 7 8 Q W E R Y P A F G H K C V B N
Auroras are caused by collisions between particles such as electrons released by the Sun, and atoms in a planet’s atmosphere. These collisions transfer energy to the atmospheric atoms causing them to emit specific colors (wavelengths) of light. On Earth, auroras occur in a layer of the atmosphere known as the ionosphere, 80 km to 400 km above the surface. If solar activity increases, the number of sunspots increases, and more particles are released by the Sun. If, on average, there were 150 sunspots in 2014, 5 in 2020, and 160 in 2023, which year(s) will have the most auroras, and which year(s) the least? Can you explain why? Answer:
A spacecraft is traveling at almost the speed of light towards Alpha Proxima, the closest star outside of our solar system. A spectrometer focused on our sun is looking at the wavelengths of light it gives off. Compared to the wavelengths observed from Earth, what would you expect to see from the speeding craft? a The apparent wavelength would be brighter. b The apparent wavelength would be dimmer. c The apparent wavelength would be shorter. d The apparent wavelength would be longer.
Green light has a frequency of about 5.3Hz×1014Hz5.3Hz×1014Hz. 1. Using the relationship c=fλc=fλ, find its wavelength in air. 2. How much larger is this wavelength compared to the size of an atom, which is about 10−10m10−10m?
A 300-megawatt solar power plant requires approximately 950, 000m2 of land area in order to collect the required amount of energy from sunlight.a. If this land area is circular, what is its radius?b. If this land area is a 42◦ sector of a circle, what is its radius?
1.The speed of light in vacuum is 3 X 105 km/s and 1 km = 1,000 m and 1m = 100 cm. Use c = f λ to determine the frequency of a photon with a wavelength of 2 cm. 2.At what absolute temperature (K) is Fahrenheit (F) temperature twice the Celsius temperature (C)?
1. Temperature of the Cosmic Microwave Background radiation (CMB) is T= 2.725 K. a) Assuming it has a Planck energy distribution, use Wien's Displacement Law to find the maximum wavelength of the CMB (in metres). b) What is the radiation energy density, u (measured in J/m³) of the CMB? c) Maximum intensity of the CMB occurs at frequency vmax = 160 GHz. Calculate energy (in Joules, J) of one photon at this frequency. d) Using the results of (2) and (3), find the number of CMB photons per m3, Nph •
(a) The distance to a star is approximately 4.97 × 10¹8 m. If this star were to burn out today, in how many years would we see it disappear? years (b) How long does it take sunlight to reach Earth? minutes (c) How long does it take for a microwave radar signal to travel from Earth to the Moon and back? (The distance from Earth to the Moon is 3.84 x 105 km.) S
1. Do all hot objects radiate light? If hot water is placed in a vacuum in total darkness will it radiate heat? Recall that heat is detected through night-vision goggles. These devices "see" infra-red light emitted by hot objects. This is evidence that heat is a part of the spectrum and therefore it can travel through a vacuum just as the other components of light. If so, then heat should travel as fast as light through a vacuum. It should travel just as fast through air. Why then does the air gap inside the thermos bottle retard the loss of heat from the hot water inside? 2. The coefficient of linear expansion of aluminum is 0.000023/C. An aluminum rod 5 meters long is heated so that its temperature rises from 25 °C to 50 °C. What is the change in its length? 3. A rectangular block of concrete has a volume of 5 cubic meters and initial temperature of 30°C. By how much will it expand if the temperature rises by 5 C°? The coefficient of thermal expansion of concrete is 10/C. 4.…
What is the energy of light having a frequency of (8.61x10^14)? Answer to 3 significant figures in scientific notation. Unit is case sensitive. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: Answer X10 units
6. The intensity of sunlight striking the earth is 1.4 kW/m^2. What is the maximum power that could possibly be absorbed by the earth? (The earth's radius is 4000 miles). How does this compare with the power demands of humankind? Given that the earth-sun distance is 93 million miles, and the pluto-sun distance is 4 billion miles, what is the intensity of sunlight striking pluto?