Chapter 29, Problem 75PE

### College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000

Chapter
Section

### College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

# Integrated ConceptsOn its high power setting, a microwave oven produces 900 W of 2560 MHz microwaves. (a) How many photons per second is this? (b) How many photons are required to increase the temperature of a 0.500-kg mass of pasta by 45.0Â°C assuming a specific heat of 0.900   kcal / kg ⋅ ° C ? Neglect all other heat transfer. (c) How long must the microwave operator wait for their pasta to be ready?

To determine

(a)

On its high-power setting, a microwave oven produces900W of2560MHz microwaves. How many photons per seconds is this?

Explanation

Given Data:

Given that a microwave oven produces900W of2560MHz microwaves

Formula Used:

Energy of photon is calculated as

E=hf

Whereh= Planck's Constant

f= Frequency

Calculation:

We havef=2560MHz=2560Ã—106Hz

â€ƒâ€ƒh=6.626Ã—10âˆ’34J.s

Energy of proton is calculated as

E=hf

E=(6.626Ã—10âˆ’34J.s)(2560Ã—106Hz)

E=1

To determine

(b)

On its high-power setting, a microwave oven produces900W of2560MHz microwaves. How many protons are required to increase the temperature of0.500kg mass of pasta by45C

To determine

(c)

On its high-power setting, a microwave oven produces900W of2560MHz microwaves.5.00×1028protons are required to increase the temperature of0.500kg mass of pasta by45C . How long must the microwave operator wait for their pasta to be ready?

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