- 13.158 g
- 13.2 g
- 13.16 g
- 13.15 g
Author: Zabeehullah
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- decrease
- increase
- remain the same
- be zero
- low frequency waves
- high frequency waves
- medium frequency waves
- ultrasonic waves
- power into power
- power into power
- mechanical power into power
- none of the above
- high output when both inputs are high
- high output when both inputs are low
- low output when both inputs are low
- high output when one input is low and the other input is high.
- Infra-red waves produce heating in a microwave oven
- The frequency of the microwaves must match the resonant frequency of the water molecules
- The frequency of the microwaves has no relation with natural frequency of water molecules
- Microwaves are heat waves, so always produce heating
- hydrogen atoms only
- atoms or ions which are uni electron
- atoms or ions which have only two electrons
- hydrogen molecule.
- telephone lines
- optical fibres
- aluminium cables
- twisted pair
- the relative frequency shift is smaller for light than for soun
- the velocity addition valid for sound is not true for light waves.
- velocity of light is very large as compared to soun
- light waves are electromagnetic waves but sound waves are mechanical.
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