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Alexxandr [17]
3 years ago
8

Approximately what core temperature is required before hydrogen fusion can begin in a star?

Physics
1 answer:
valkas [14]3 years ago
8 0

Answer:

The temperature required is near about 3 million kelvin

Explanation:

The brilliance of the star results from the nuclear reaction that take place in the core of the star and radiate a huge amount of thermal energy resulting from the fusion of hydrogen into helium.

For this reaction to take place, the temperature of the star's core must be near about 3 million kelvin.

The hydrogen atoms collide and starts and the energy from the collision results in the heating of the gas cloud. As the temperature comes to near about 1.5\times 10^{7 {\circ}C, the nuclear fusion reaction takes place in the core of the gas cloud.

The huge amount of thermal energy from the nuclear reaction gives the gas cloud a brilliance resulting in a protostar.

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We would like to place an object 45.0cm in front of a lens and have its image appear on a screen 90.0cm behind the lens. What mu
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Answer:

the radii of curvature is 30 cm.

Explanation:

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object is place at = 45 cm

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focal length = ?

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\dfrac{1}{f} = \dfrac{1}{u} +\dfrac{1}{v}

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using lens formula

\dfrac{1}{f} = (n-1)(\dfrac{1}{R_1} -\dfrac{1}{R_2})

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R = (n -1)\ f

R = 2(1.5 -1)\ 30

R = 30 cm

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