The energy of the EM waves is of the order of \(15~\mathrm{keV}\). To which part of the spectrum does it belong?
1. X-rays
2. Infrared rays
3. Ultraviolet rays
4. \(\gamma\)-rays
The condition under which a microwave oven heats up a food item containing water molecules most efficiently is:
1. | the frequency of microwaves has no relation with the natural frequency of water molecules. |
2. | microwaves are heatwaves, so always produce heating. |
3. | infrared waves produce heating in a microwave oven. |
4. | the frequency of the microwaves must match the resonant frequency of the water molecules. |
1. | gamma rays, ultraviolet, infrared, microwaves. |
2. | microwaves, gamma rays, infrared, ultraviolet. |
3. | infrared, microwave, ultraviolet, gamma rays. |
4. | microwave, infrared, ultraviolet, gamma rays. |