Podcast
Questions and Answers
Why is the area above a fire typically hotter than the area at the same distance to the side?
Why is the area above a fire typically hotter than the area at the same distance to the side?
- Because heat rises due to gravitational forces.
- Because convection carries heated air upwards, and radiation transfers heat in all directions. (correct)
- Primarily due to conduction of heat through the air.
- Due to a higher concentration of oxygen above the fire.
How does the root mean square (RMS) speed of gas molecules relate to temperature?
How does the root mean square (RMS) speed of gas molecules relate to temperature?
- Directly proportional to the pressure of the gas.
- Proportional to the temperature. (correct)
- Directly proportional to the square of its temperature.
- Inversely proportional to the square root of its temperature.
Why does water boil at a lower temperature on hills compared to plains?
Why does water boil at a lower temperature on hills compared to plains?
- The atmospheric pressure is lower on hills, decreasing the boiling point. (correct)
- There is less water available on hills.
- The chemical composition of water changes at higher altitudes.
- The specific heat capacity of water is lower at higher altitudes.
A wave's velocity and frequency are both reduced to one-half of their original values. What happens to the wavelength?
A wave's velocity and frequency are both reduced to one-half of their original values. What happens to the wavelength?
Why do sound waves typically travel faster in water compared to air?
Why do sound waves typically travel faster in water compared to air?
What aspect of sound is most directly related to the energy it transmits?
What aspect of sound is most directly related to the energy it transmits?
What is the approximate intensity of the faintest sound that a human with normal hearing can perceive (threshold of hearing)?
What is the approximate intensity of the faintest sound that a human with normal hearing can perceive (threshold of hearing)?
Which instrument is specifically designed to measure a person's blood pressure?
Which instrument is specifically designed to measure a person's blood pressure?
What is the purpose of the phosphor coating inside a fluorescent lamp?
What is the purpose of the phosphor coating inside a fluorescent lamp?
The principle stating that 'the ratio of the sines of the angles of incidence and refraction is constant for a given pair of media' is known as which of the following?
The principle stating that 'the ratio of the sines of the angles of incidence and refraction is constant for a given pair of media' is known as which of the following?
Flashcards
Radiation of Heat
Radiation of Heat
Heat transfer through electromagnetic waves.
Sphygmomanometer
Sphygmomanometer
Instrument to measure blood pressure.
Boiling Point at Hills
Boiling Point at Hills
The boiling point decreases at higher altitudes.
Phosphor
Phosphor
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Snell's Law
Snell's Law
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Huygen's Principle
Huygen's Principle
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Divergent Lens
Divergent Lens
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Hydrometer
Hydrometer
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Intensity
Intensity
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Threshold of Hearing Intensity
Threshold of Hearing Intensity
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Study Notes
- It is hotter over the top of a fire due to radiation of heat.
- The root mean square speed of gas molecules is directly proportional to the square of its temperature T.
- The boiling point of water on plains is 100°C, but at hills, it is less than 100°C.
- If the velocity and frequency of a wave are both reduced to one-half, the wavelength will remain the same.
- Sound travels faster in water than in air because water has a greater bulk modulus than air.
- Intensity refers to a measure of the energy of sound.
- The intensity of the threshold of hearing is 10^-12 W/m².
- A Sphygmomanometer is used to measure blood pressure in humans.
- Phosphor is the coating material used inside fluorescent lamps to emit visible light when excited by ultraviolet radiation.
- "The ratio of the sines of the angles of incidence and refraction is equal to the ratio of the speeds of light in the two media" is known as Snell's Law.
- "Every point on a wavefront can be considered a source of secondary wavelets that spread out in all directions with the wave speed of the medium and the wavefront at any time is the envelope of these wavelets." This statement is known as Huygen's principle.
- A divergent lens deviates parallel light outward as though it originated at a single virtual focal point.
- A hydrometer uses Archimedes' principle.
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