The cause of echo is reflection of sound. When sound waves encounter a smooth and hard surface, such as a wall or cliff, they bounce back towards the source. If the reflected sound reaches the listener’s ears distinctively after the ...
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The true statement for sound waves is at 0 °C their speed is 332 meters per second. Sound waves cannot be polarized because they are longitudinal waves, and they cannot travel in a vacuum as they require a medium to ...
The velocity of sound varies across different mediums and is highest in solids. This is due to the tightly packed molecules in solids, which facilitate quicker transmission of sound waves. In contrast, sound travels slower in liquids and slowest in ...
Humans feel sound vibrations in the frequency range of 20-20,000 Hz. This range encompasses the audible spectrum where human ears are sensitive to vibrations in the air, allowing us to perceive sound from low-pitched tones to high-pitched sounds like bird ...
A thermometer suitable for measuring 2000 °C is a total radiation pyrometer. These devices are designed to measure extremely high temperatures by detecting the thermal radiation emitted by an object, making them ideal for temperatures far beyond the range of ...
The reason a glass of water does not change into ice at 0°C is that to freeze the water, some amount of heat must be removed from it. Freezing occurs when water loses heat energy, causing its temperature to drop ...
A body absorbs the most heat when it is black and rough. Black surfaces absorb more radiation across a broader spectrum of wavelengths compared to lighter surfaces, and rough surfaces have more surface area for radiation absorption.
The first law of thermodynamics confirms the concept of energy conservation. It states that energy cannot be created or destroyed, only transformed from one form to another, ensuring the total energy of an isolated system remains constant.
The boiling point of water depends on the pressure above the open surface of water. As pressure increases, the boiling point rises, and as pressure decreases, the boiling point lowers.
The rate of evaporation for a certain liquid depends on all the above factors. It depends on the temperature of the liquid, the temperature of the air, and the open surface area of the liquid.