Physics, 04.02.2020 23:53 Molly05

Microwave ovens have become popular in kitchens everywhere. they are also used in the laboratory, particularly in drying samples for chemical analysis. a typical microwave oven uses radiation with a 12.2 cm wavelength. a.how many moles of photons of this radiation are required to raise the temperature of 345 g of water from 26.5 ºc to 99.8 ºc? b. the watt is a unit of power—the rate at which energy is delivered or consumed: 1 w = 1 j/s. assume that all the energy of a 700. w microwave oven is delivered to the heating of water described in (a). how long will it take to heat the water?

Answers: 2

Show answers

Other questions on the subject: Physics

Physics, 22.06.2019 01:30, markmeinberg

Ajet plane has a sound level of 120 db at a distance of 60 m. what is the q23. sound level at a distance of 6.0 km? (60)2 (6000)? om solution 80db db, hint: 16x assume ultrasound waves travel through the body of an animal at 1540 q24. m/s. if a 30,000 hz signal were reflected off a portion of a heart which was moving toward the source at 3 m/s, what frequency signal would return to the stationary source? solution 30.117hz

Answers: 3

continue

Physics, 22.06.2019 05:50, kamrulh278

Acylinder with a movable piston contains 11.7 moles of a monatomic ideal gas at a pressure of 1.32×10^5 pa. the gas is initially at a temperature of 300 k. an electric heater adds 43200 j of energy into the gas while the piston moves in such a way that the pressure remains constant. cp=20.79 j k^−1 mol^−1 for a monatomic ideal gas, and that the number of gas molecules is equal to avogadro's number (6.022×10^23) times the number of moles of the gas. (a) what is the temperature of the gas after the energy is added? (b) what is the change in volume of the gas? (c) how much work is done by the gas during this process?

Answers: 3

continue

Physics, 22.06.2019 10:00, unknown6669

Which type of basaltic lava flow has a fairly smooth

Answers: 2

continue

Physics, 22.06.2019 10:00, amyaacrawford86

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix. b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds. c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer. d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.

Answers: 1

continue

You know the right answer?

Microwave ovens have become popular in kitchens everywhere. they are also used in the laboratory, pa...