GS One‑Liners
high‑yield facts · smart revision
5107
facts
5107
results
Latest facts first
| # | Question & Answer |
|---|---|
| 4126 |
What is the critical angle?
-
The minimum angle of incidence in the denser medium for which TIR occurs
|
| 4127 |
What is total internal reflection (TIR)?
-
Complete reflection of light inside a denser medium when incidence angle exceeds critical angle
|
| 4128 |
What is the refractive index?
-
Ratio of speed of light in vacuum to speed of light in a medium, n = c/v
|
| 4129 |
What is refraction of light?
-
Bending of light when it passes from one medium to another
|
| 4130 |
What is the law of reflection?
-
Angle of incidence equals angle of reflection, and incident ray, reflected ray, and normal lie in the same plane
|
| 4131 |
What is reflection of light?
-
Bouncing back of light from a surface
|
| 4132 |
What is the nature of light?
-
Light exhibits both wave and particle properties (wave-particle duality)
|
| 4133 |
How does sound propagate in different media?
-
Faster in solids, slower in gases, intermediate in liquids
|
| 4134 |
How do thermodynamics laws apply to engines and refrigerators?
-
First law: energy conservation; Second law: efficiency limits, heat flow direction
|
| 4135 |
How is work done by a gas in thermodynamics calculated?
-
W = PΔV, pressure × change in volume
|
| 4136 |
Can phase changes occur without temperature change?
-
Yes, as in melting, boiling, or condensation
|
| 4137 |
How is specific heat capacity used in calorimetry?
-
To calculate heat exchange and temperature change in experiments
|
| 4138 |
How does heat transfer differ in solids, liquids, and gases?
-
Conduction dominates in solids, convection in liquids and gases, radiation occurs in all mediums
|
| 4139 |
What are applications of infrasound?
-
Detection of earthquakes, volcanic eruptions, and monitoring animal communication
|
| 4140 |
What is infrasound?
-
Sound waves with frequency below 20 Hz, below human hearing
|
| 4141 |
What are applications of ultrasound?
-
Medical imaging, cleaning, sonar, and industrial flaw detection
|
| 4142 |
What is ultrasound?
-
Sound waves with frequency above 20 kHz, beyond human hearing
|
| 4143 |
Give an example of the Doppler Effect in daily life.
-
Ambulance siren sounds higher-pitched as it approaches and lower-pitched as it moves away
|
| 4144 |
What is the Doppler Effect?
-
Change in frequency or pitch of a sound due to relative motion between source and observer
|
| 4145 |
What is the speed of sound in air at room temperature?
-
Approximately 343 m/s
|
| 4146 |
What determines the quality of a sound?
-
Harmonic content and waveform of the sound
|
| 4147 |
What determines the loudness of a sound?
-
Amplitude of the sound wave
|
| 4148 |
What determines the pitch of a sound?
-
Frequency of the sound wave
|
| 4149 |
What are the characteristics of sound?
-
Pitch, Loudness, and Quality (Timbre)
|
| 4150 |
What is a sound wave?
-
Longitudinal wave caused by vibration of particles in a medium
|