Aballoon is filled with helium at a pressure of 2.4 x 105 pa. the balloon is at a
temperature of 18 oc and has a radius of 0.25 m. (a) how many helium atoms are
contained in the balloon? (b) suppose we double the number of helium atoms in the
balloons, keeping the pressure and the temperature fixed. by what factor does the radius
of the balloon increase?

Which sound characteristic is not affected by the relative motion of an object

Infrared radiation has wavelengths that are shorter than visible light is part of the visible light spectrum has wavelengths that are longer than visible light has the same wavelengths as ultraviolet radiation

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. 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.