Of normal matter, about 25% of it by mass is still primordial helium even today
Indicate whether the statement is true or false
TRUE
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Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. Sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. Which one, if either is correct?
A. Beryl, because low thermal conductivity results in low heat transfer. B. Beryl, because low thermal conductivity results in high heat transfer. C. Sapphire, because low thermal conductivity results in low heat transfer. D. Sapphire, because low thermal conductivity results in high heat transfer. E. Neither, because low heat transfer is desirable both in summer and in winter.
Why doesn't warm, dense hydrogen emit 21-cm radiation?
What will be an ideal response?
Which of the following has units of momentum?
A) N-m B) kg-s/m C) kg-m2/s D) J-s/m E) kg- /
The resistance of the heater is 10 ohms
Indicate whether the statement is true or false