Question

Which of the following instruments is used to measure the frequency of electromagnetic waves?
1. Odometer
2. Ohmmeter
3. Wavemeter
4. Nephelometer

Answer 1

Correct Answer - Option 3 : Wavemeter

The correct answer is Wavemeter.

• The Wavemeter was invented for measuring the frequency of electromagnetic waves.

Name of the Instrument	Functions/ Used for
Hydrophone	Measures sound under the water.
Hydroscope	Shows the changes in atmospheric humidity.
Hypsometer	Determines the boiling point of the liquid.
Machmeter	Determines the speed of an aircraft relative to the speed of sound.
Ondometer	Measures the frequency of electromagnetic waves.
Ohmmeter	Measures electrical resistance.
Odometer	Measures distance traveled by a vehicle.
Nephelometer	Measures the scattering of light by particles suspended in a liquid.
Microphone	Converts sound waves into electrical vibration.
Micrometer	Gives a magnified view of small objects.

Name of the Instrument	Functions/ Used for
Dendrometer	Measures plant growth.
Dynamometer	Measures mechanical force.
Electroscope	Detecting electrical changes in the body.
Evaporimeter	Measures the rate of evaporation.
Konimeter	Amount of dust in the air.
Magnetometer	Measure the intensity of magnetic fields.
Osmometer	Measure osmotic pressure.
Kymograph	Record fluid pressure.
Durometer	Measures hardness of substance.
Dilatometer	Measures changes in the volume of substances.