Chemistry

A particular microwave oven delivers 800 watts. (A watt is a unit of power, which is the joules of energy delivered, or used, per second.) If the oven uses microwave radiation of wavelength 12.2 cm, how many photons of this radiation are required to heat 1.25 g of water 1.00°C, assuming that all the photons are absorbed?

  1. 👍 0
  2. 👎 0
  3. 👁 467
  1. I would do this.
    Energy of one photon of 12.2 cm
    E = hc/wavelength. Remember wavelength must be in meters.
    Then Energy needed to heat 1.25 g water =
    q = mass H2O x specific heat water x delta T.
    So how many photons must be used to acquire q.

    1. 👍 0
    2. 👎 0
  2. Thanks Dr. Bob

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. chemistry

    A 100-watt light bulb radiates energy at a rate of 100 J/s. (The watt, a unit of power or energy over time, is defined as 1 J/s.) If all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

    asked by anon yo on October 6, 2016
  2. Physics

    An ice cube is placed in a microwave oven. Suppose the oven delivers 105 W of power to the ice cube and that it takes 32,200 J to melt it. How long does it take for the ice cube to melt?

    asked by John on March 16, 2010
  3. physics help

    At a certain location, the solar power per unit area reaching the Earth's surface is 180 W/m2 averaged over a 24-hour day. Suppose you live in a solar powered house whose average power requirement is 3.2 kW. At what rate must

    asked by sarah on March 27, 2011
  4. algebra

    If an electronic circuit experiences a loss of 3 decibels with an input power of 6 watts, what would its output power be, to the nearest watt?

    asked by Jay on July 1, 2012
  5. Calculus (Derivatives)

    A tray of lasagna comes out of the oven at 200°F and is placed on a table where the surrounding room temperature is 70°F. The temperature T (in °F) of the lasagna is given by the function T(t) = e^(4.86753 - t) + 70, where t is

    asked by Mishaka on October 29, 2011
  1. math

    Madison spent 5/8 of her savings on a microwave oven & a refrigerator. She used 4/7 of the amount she spent to buy the refrigerator. The refrigerator cost $280 more than the microwave oven. How much savings did Madison start with?

    asked by Tyler on January 1, 2013
  2. chemistry

    A microwave oven heats by radiating food with microwave radiation which is absorbed by the food and converted to heat. Suppose an oven's radiation wavelength is 12.5 cm. A container with 0.250 liter of water was placed in the oven

    asked by jimmercarbone on October 31, 2012
  3. Physics

    A power station with an efficiency of 0.4 generates 10(to the power of 8)watts of electric power and dissipates 1.5 x 10(to the power of 8) watts of thermal energy to the cooling water that flows through it. Knowing that the

    asked by Anonymous on January 1, 2010
  4. 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

    asked by kelsie on October 13, 2008
  5. 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

    asked by Kez on November 5, 2012
  6. science

    A linear circuit is shown below in Figure 1. Figure 1 The elements in this circuit have the following values: R1=100Ω, R2=200Ω, R3=350Ω, V=5V, and I=0.004A. Determine the potentials drops vA and vB across resistors R1 and R2

    asked by Anonymous on May 2, 2013

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