What is the maximum power consumption of a 3.0-V portable CD player that draws a maximum of 290 mA of current? Express your answer using two significant figures.

The power consumption by the CD player is 0.87 watts.

Explanation:

Given that,

Voltage of the portable CD player, V = 3 volt

Maximum current drawing the CD player,

We need to find the maximum power consumption by the CD player. We know that the electrical power of any appliance is given by :

So, the power consumption by the CD player is 0.87 watts. Hence, this is the required solution.

the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas

you'd use the equation that establishes a relationship between  energy  and  wavelength, which looks like this

e=h⋅cλ, where

λ  - the wavelength of the photon; c  - the speed of light, usually given as  3⋅108m/s; h  -  planck's constant, equal to  6.626⋅10−34j s

plug the value you were given for the energy of the photon in the above equation to get the wavelength

e=h⋅cλ⇒λ=h⋅ce

λ=6.626⋅10−34js⋅3⋅108ms−1.257⋅10−24j=1.581⋅10−1m