Isolated bells ring clear, while bells crammed in a box have a muffled ring. if the sound of isolated bells is analogous to light from a gas discharge tube, then sound from the box crammed with bells is analogous to light from group of answer choices

1. a phosphorescent source.
2. none of these
3. an incandescent lamp.
4. a fluorescent lamp.
5. a laser.

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?

For the below questions, consider a consumer that consumes two goods, x and z with the following utility function. u with bar on top space equals space x to the power of 1 third end exponent z to the power of 2 over 3 end exponent suppose initial values for income and the prices of goods x and z are y equals 90, p subscript x equals space 10, and p subscript z equals 15 respectively, then the price of good x falls to syntax error from line 1 column 89 to line 1 column 100. unexpected '\'.. what is the magnitude of the total effect