Waves

Thermocouple is based on See beck effect. If one junction is at and the other att , then the thermo emf is given by where a and b are constants for the pair of metals. As the temperature of the hot junction rises, the thermo emf increases and becomes maximum at a particular temperature. This temperature is called neutral temperature and has different values for different pairs of metals. Temperature at which thermo emf becomes zero is called inversion temperature. Hence, neutral temperature is a characteristic temperature.

The fundamental frequency or

The speed of a wave decreases when it travels from rarer to denser medium whereas speed increases when wave travels from rarer to denser medium.

Energy transferred with the propagation of longitudinal wave.

In compression region density increases and in rarefaction density decreases. So, density varies due to sound propagation.

According to the question, Frequency,

Wavelength,
Wave velocity,

Let be the length of the pipe. Then its fundamental frequency is

where is the speed of sound in air

If the pipe is dipped vertically in water such that of its length is inside the water, then it becomes a closed organ pipe of length as shown in figure above
Now the fundamental frequency of air column is


using (i))

Step 1: Understand the nature of wave propagation.
Electromagnetic waves, such as radio waves, gamma waves, and infrared waves, do not require a medium to propagate and can travel through a vacuum.

Step 2: Understand the infrasonic waves.
Infrasonic waves are sound waves, and sound waves require a medium (such as air, water, or solid substances) to propagate.
Therefore, they cannot travel in a vacuum.