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31.05.2021 15:04
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How can a star be extremely hot like Alpha Canis Majoris (4 times hotter than our

How can a star be extremely hot like Alpha Canis Majoris (4 times hotter than our sun) but give off so little light (only 2% of our sun's light)?
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asdasddas776
asdasddas776
4,6(95 marks)

A) 240 W

B) 864000 J

Explanation:

Hi!

We can easily calculate the required power multiplying the voltage of the process times the circulating current:

P=12V\times 20A=12(\frac{J}{coulomb})\times20(\frac{coulomb}{s})\\P = 240\frac{J}{s}=240W

To calculate the total energy provided we need to multiply the power times the total time:

E=P\times t=240\frac{J}{s} \times 1 hr =240\frac{J}{s} \times 3600s\\ E=864 000J

Hope this helps

Have a nice day!

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