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Why can we say that the rate at which the sun gives off energy at the surface (the luminosity) must be equal to the rate at which it produces energy deep down in the core?So, measuring the luminosity of the sun is equivalent to measuring the rate at which the nuclear reactions produce energy in the core of the sun. But we think we know exactly how those reactions work: 4 H atoms -> 1 He atom + energywhere the energy is released because some of the mass of the Hydrogen atoms is converted to energy. Mass of 1 Hydrogen atom: 1.673 x 10-24 gramsMass of 1 Helium atom: 6.644 x 10-24 gramsThis nuclear reaction has an input (4 H atoms) and two outputs : 1 He atom and energy. Since the He atom has less mass than 4 H atoms, that difference in mass must have been converted to energy. If the energy is produced via E=mc2, how much energy is produced by producing one He atom from 4 H atoms? (see also the units notes at the bottom). (Hint: How much mass is converted into energy?) So, for every 4 hydrogen atoms fused, we get the amount of energy you calculated above. But we know how fast the sun has produced energy (the luminosity, according to #1), so we know how fast the hydrogen fuel in the core of the sun is being used up.If the sun gives off 3.89 x 1033 ergs every second, how many hydrogen atoms are being destroyed every second? The sun will remain a main sequence star until it runs out of hydrogen fuel in the core of the star. The core of the sun contains about 10% of the total mass of the star. Why are these reactions confined to the core? The total mass of the sun is 2x1033 gm. How long will it take until the sun has used up all the hydrogen atoms in the core (the central 10%)? That is, what is the main-sequence lifetime of the sun? Compare the lifetime of the sun to the current age. How soon will the sun running out of fuel be a problem?
A helicopter is ascending vertically with a speed of 5.02m/s. At a height of 140m above the Earth, a package is dropped from the window. How much time does it take for the package to reach ground.
A long, narrow rectangular loop of wire is moving toward the bottom of page with a speed of 0.025 m/s. The loop is leaving a region in which a 2.1 T magnetic field exists; magnetic field outside this region is zero. All through the time of 1.0 s, wha..
Illustrate what are the possible weaknesses in the Kimberely Process? Illustrate what role do you think the three sectors will have in addressing these weaknesses?
What was the final temperature of the coins. What is the train's acceleration after its wheel begins to stick.
The beam emerging from a ruby laser (wavelength 694.3 nm) passes through a circular aperture 6.2 mm in diameter. what is the angular spread of the beam
A 10 kg runaway grocery cart runs into a spring with spring constant 240N/m and compresses it by 65cm. What was the speed of the cart just before it hit the spring.
A cart is moving horizontally along a straight line with constant speed of 30 m/s. At what speed(relative to the cart), and angle must the projectile be fired
When the knob of a certain radio tuning capacitor is turned, the effective area of the plates in the interleaved position is reduced from 40 cm^2 to 10cm^2, What is the ratio of initial to the final capacitance
Three 4 uF capacitors are connected in parallel across the terminals of a 120 Hz generator. What is the capacitive reactance of the circuit
Which physical parameter, more than any other, most probably controlled the early evolution of the planetary system and dictated the characteristics of the planets that eventually formed?
Place the light source with the object at 0 cm on the optical rail. Where is the position of the image?
An airplane has a mass of 1.8×10^6 kg , and the air flows past the lower surface of the wings at 94 m/s .f the wings have a surface area of 1300 m^2, how fast should the air flow over the upper surface of the wing if the plane is to stay in the ai..
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