Chemistry

microwave ovens work by irradiating food with microwaves, which is absorbed by the water molecules in the food and is converted into heat. Assuming that microwave ovens emit radiation with a wavelength of 12.2cm, calculate how many photons are emitted per second in a 1000-Watt microwave oven.

  1. 👍
  2. 👎
  3. 👁
  1. 1000 watts = 1000 joules/second

    E = hc/wavelength
    E = 6.626E-34*3E8/12.2E-2 for one photon.
    1.6E-24 J/photon x # photons = 1000 joules/sec.
    Solve for # photons.

    1. 👍
    2. 👎
  2. 1.63E-27 photon/sec

    1. 👍
    2. 👎
  3. 220

    1. 👍
    2. 👎
  4. 1000/(1.6*10^-24) =
    6.25*10^26 photons/sec

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Help me with science

    Use the table to answer the question. Sample Observation 1 The drop of food coloring spreads slowly. 2 The drop of food coloring spreads very quickly. A student places a drop of food coloring into two water samples. Her

  2. Chemistry

    Microwave ovens emit microwave energy with a wavelength of 12.5 cm. What is the energy of exactly one photon of this microwave radiation?

  3. chemistry

    Enormous numbers of microwave photons are needed to warm macroscopic samples of matter. A portion of soup containing 177 g of water is heated in a microwave oven from 20degrees Celsius to 98 degrees Celsius, with readiation of

  4. biology

    Which of the following is not true about water molecules? a. Water molecules are polar b. Water molecules form hydrogen bonds c. Water molecules form ionic bonds *** d. Water is an effective solvent

  1. Chemistry

    Microwaves are used to heat food in microwave ovens. The microwave radiation is absorbed by moisture in the food. This heats the water, and as the water becomes hot, so does the food. How many photons having a wavelength of 3.00

  2. physics

    (a) Two microwave frequencies are authorized for use in microwave ovens: 900 and 2560 MHz. Calculate the wavelength of each. 1 cm (frequency = 900 MHz) 2 cm (frequency = 2560 MHz) (b) Which frequency would produce smaller hot

  3. Check my answers?--SCIENCE

    1. What is true about X-rays and microwaves? a. X-rays have greater speed than microwaves. b. X-rays have greater amplitude than microwaves. c. X-rays have greater frequency than microwaves. d. X-rays have greater wavelength than

  4. Science

    Bart believes that mice exposed to microwaves will become extra strong (maybe he's been reading too much Radioactive Man). He decides to perform this experiment by placing 10 mice in a microwave for 10 seconds. He compared these

  1. Chemistry

    Microwave ovens emit microwave energy with a wavelength of 13.0 cm. What is the energy of exactly one photon of this microwave radiation?

  2. Chemistry

    How many molecules are in 2.10 mol CO2? A. 2.53 x 10^24 molecules B. 3.79 x 10^24 molecules C. 3.49 x 10^24 molecules D. 1.26 x 10^24 molecules*** I think it is D, but can someone check my work? Amount of mols x Avogadro's number

  3. Chemistry of Life

    Which statement is true about water molecules? The oxygen atom has a negative charge. The hydrogen atoms do not share electrons. Water molecules move randomly around each other. Water molecules cannot dissolve many substances.

  4. physics

    Microwave ovens typically cook food using microwaves the a frequency of about 3.00 GHz (gigahertz 10 to the nine Hz). Show the wavelength of these microwaves traveling at the speed of light is 10cm.

You can view more similar questions or ask a new question.