Answer:
There is matter in gas but due to the high intermolecular forces, all the molecules of gas are far apart
Since the size of a molecule is almost negligible to the human eye, we cannot see the gas molecules and hence, gas is invisible to the naked eye
If you compress a gas against the intermolecular forces, the gas will turn into a liquid
Answer:
Waves have many properties, including frequency, wavelength, amplitude, timbre, and direction. ... A higher frequency sound is perceived as a higher note, because frequency is the same thing as pitch. The amplitude is how tall the wave is. A higher amplitude sound wave is a louder sound.
Explanation:
Answer:
Star A
Explanation:
μ = proper motion = 1 arcsecond per year
r = 20 light-years = Distance
Transverse velocity
V = 1.45 × μ × r
⇒ V = 1.45 × 1 × 20
⇒ V = 29 km/sec
When r = 10 light-years
V = 1.45 × 1 × 10
⇒ V = 14.5 km/sec
∴ Star A which is 20 light-years from Earth is moving faster compared to Star B which is 10 light-years from Earth.