1). A star has six times the radius of the Sun (Appendix C) and a temperature of 2000 K. Find its luminosity. Compare that to the actual luminosity of the Sun. Stars have an emissivity of 0.95.

Q: If the temperature in the core of the sun were to increase the rates of nuclear reactions…

A: Fusion is the main source of energy in the Sun. Fusion happens at a high temperature when the matter…

Q: The magnitude of the solar constant that has a temperature of 5800 k and a radius of 7 * 10^5 km and…

A: Temperature (T) = 5800 Kelvin Radius (R) = 700000 km = 7×108 m Distance (d) = 1.5×1011 m

Q: ssing information. Use gravity, g = 10 m/s² avelength =_ (7) meter %3D Linear mass Mass (gram)…

A: V= √T/u  V=f(wavelength)

Q: Why do sunspots appear dark? a. Regions of the photosphere are obscured by material in the…

A: The solar spots are mostly cooler places than the surroundings

Q: Which of the following is least reasonable regarding energy production in the Sun? Group of answer…

A: The statement that is least reasonable regarding energy production in the Sun is:"Although the Sun…

Q: Assume that Hydrogen comprises 78% of the Sun’s mass. How much mass is this?

A: The original mass of the sun is,

Q: Calculate the average surface temperature of the Sun using Wien’s Law. The wavelength of maximum…

A: λ = 500nm

Q: H.w: Find Solar haur angte as th Solar time (9:00, 10:10, 12:15,15825) for May 2012 in Baghdadl.

A: Here we use   Time (t) in the decimal form use , t=ω1h15∘

Q: Explain why some solar shock waves are thought to die out at heliocentric distances of 3-5 R. How…

A: Explanation, Some solar shock waves are thought to die out at heliocentric distances of 3-5R⊙

Q: sun emits light having maximum intensity at a wavelength 468nm. Assume emissivity of sun is 1.…

A: Option

Q: What is the source of energy for the sun? O hydrogen fusion O nuclear fission of metals O internal…

A: In the given question we have to discuss about the source of energy for the sun.

Q: Sunspots are related to the Sun's a. core rotation b. magnetic field lines tangling c.…

A: Correct option is (b) i eagnetic field lines tangling .

Q: Using the concept of hydrostatic equilibrium, explain why the Sun does not collapse under the weight…

A: Hydrostatic equilibrium is the balance between the gravitational force and the pressure gradient…

Q: Rank the layers of the Sun based on their average temperature, from hottest to coolest. A) Corona B)…

A: The Sun can be divided into six layers.

Q: If steel has ten times the density of water, how many times more dense is the hydrogen plasma at the…

A: Soln:   Density of water (SW ) = 1 gm/cm3  ----  (1)                     As density of steel is…

Q: For a satellite launched to an altitude of 800 km, is there any significant difference to the…

A: Solar cycle- It is a period of 11 years.

Q: For April 10th at a location at 40° latitude, calculate: (i) the extraterrestrial normal radiation…

A:

Q: Based on what you've learn on the impact of the Earth-Sun distance on the seasons, what can you say…

A:

Q: Even if the Earth's orbit were circular, we would still have seasons. The reason is that…

A:

Q: 6.96 X 10 km) Use this result to compute the approOximate period of the Sun's rotation. (R. 13-2.…

A: Given: Potential energy of the Sun, U = (-2GM2/R) Radius, R = 6.96 × 105 km Mass, M = 1.99 × 1030 kg

Q: Exercise: Determine the amount of solar energy approaching Earth if its diameter is 12700km.

A:

Q: According to the Stefan-Boltzmann law, how much energy is radiated into space per unit time by each…

A: A blackbody absorbs all the radiation that falls on it and then re-emits it.   Stars can be…

Q: In the Sub giant phase which of the following is true? O The star is burning He in the core O The…

A: Given : In the Sub giant phase  The star is burning He in the core The star is burning He in a shell…

Q: Calculate the maximum and minimum solar elevation angles for a city (85°N, 18°E)

A: At sunrise and sunset the elevation angle is Zero (0°). The solar elevation angle is maximum in…

Q: Why does the Sun not collapse under its enormous weight? a) The Sun is about 4.6 billion years old.…

A: The Sun does not collapse under its enormous weight. This is because of hydrostatic equilibrium. In…

Q: A solar flare can release 1025 J. How many megatons of TNT would be equivalent?

A: TNT or Trinitrotoluene is a chemical used for a controlled explosion. Its IUPAC name is…

Q: If each square cm of the sun's surface radiates energy at the rate of 1.5x 10° cal/s/cm? and…

A: A blackbody is an object that is capable of absorbing all the radiation that falls on it and…

Q: Compute the solar zenith angle for solar noon on June 13, 2015 in a location with latitude 73°N and…

A: The date is given as, June 13, 2015. The location is given as, Latitude=73oN and Longitude=92oW. TO…

Q: For Jeddah, Saudi Arabia (GMT + 3 hours, 21.48° N. 39 19* E) on Apri 22nd. 2021 If a solar collector…

A: Hi the correct answer is  option b     The hour angles at sunrise and sunset (ωS) are very useful…

Q: Solar Zenith Angle at Nordlysstasjonen 60 Daylight 80 100 Evening/Nighttime 120 100 200 300 Day of…

A: The Earth progresses through its seasons because its north-south axis has a 23.5-degree tilt. During…

Q: What is the wavelength of maximum intensity (in nm) and the total energy emitted (in J/s/m2) by a…

A: The temperature of the celestial body is given to be 7K. In case of a celestial body which we…

Q: If a certain star is 4 times as hot as the sun and is 10000 times brighter than the sun, calculate…

A: Given, Temperature of star, TA=4xTE, Luminosity of star, LA=10000x LE.

Q: Estimate the rate at which the Sun loses mass (kg/s) due to the solar wind. Assume the solar wind is…

A:

Q: How does the mass of the sun change during its lifetime- does it increase, decrease or stay the…

A: How does the mass of the sun change during its lifetime- does it increase, decrease or stay the…

Q: Determine the change in the sun density of the E-layer when the citical frequency changes from 4 MHz…

A:

Q: Why does it take so long for the energy produced in the Sun's core to reach the surface?

A: The main source of energy in stars like our Sun is hydrogen fusion. In this process, hydrogen is…

Q: Calculate the gravitational energy released by the Sun.

A: Gravity is the force of attraction between objects with mass. It is responsible for the formation of…

Q: What are the negative effects if you change the elements, functions and interconnectin of the solar…

A: We have discussed the negative effects of solar system when we change the elements, function and…

Q: Assume that Hydrogen comprises 74% of the Suns' mass. How much mass is this?

A: The mass of the Sun is

Q: The Sun has a radius of 6.955×105 km and a mass of 1.989×1030  kg. What is the density of the Sun?…

A: Considering sun as a sphere, the volume of sun is

Q: Give the following figure of the sun, label the features observed and describe some of the…

A:

Q: The surface temperature of the Sun is 5,800 K.   What wavelength of light is most intense?…

A:

Q: During a solar cycle, how long does it take (on average) for the Sun's magnetic field polarity to…

A: The solar's magnetic interest goes thru a repeating cycle referred to as the solar cycle, which has…

Q: Description: Imagine you are comparing the five electric hot plates (A – E) of different sizes and…

A:

Q: Suppose the Sun were to shrink to 50% of its present diameter. How would the gravitational energy…

A: Gravitational force is one of the fundamental forces of nature. It is defined as the force of…

Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.