Amicrowave oven operates at 3.00 ghz . what is the wavelength of the radiation produced by this appliance?

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Speed of light is 300,000,000 meters per second or 3E8 m/s 

Wavelength = Speed of light divided by the frequency = c / f 

3 GHz = 3 GigaHertz = 3E9 Hertz = 3,000,000,000 Hz 

L = (300,000,000 m/s) / (3,000,000,000 Hz) = 0.1 meter = 10 centimeters 

You will hear a hissing sound because of the carbon dioxide escaping the can or bottle

Answer(b) both involve the use of levers;