Answer:
500 THz .
Explanation:
Velocity of light in air = 3 x10⁸ m /s
wave length of light = 600 nm
= 600 x 10⁻⁹ m
= 6 x 10⁻⁷ m
frequency in air = velocity in air / wave length in air
= 3 x 10⁸ / 6 x 10⁻⁷
= .5 x 10¹⁵ Hz
= 5 x 10¹⁴Hz
= 500 x 10¹² Hz
= 500 THz
When light enters the medium of gem , its wavelength and velocity changes in such a way that its frequency remains constant. So in the medium of gem also its frequency remains 500 THz .
Answer:
13 m/s
Explanation:
Given:
Δy = 8.2 m
v₀ = 0 m/s
a = 9.8 m/s²
Find: v
v² = v₀² + 2aΔy
v² = (0 m/s)² + 2 (9.8 m/s²) (8.2 m)
v = 12.7 m/s
Rounded to two significant figures, the speed is 13 m/s.
Inside the torch, they usually use copper or brass to conduct electricity.
I would say it B) in the same direction feel free to ask me more question
Answer:
The answer to this is
6600 Hz to 19,800 Hz
Explanation:
The shape of the human ear is analogous to a closed ended pipe hence
we have λ = 4L or wavelength = 4 * length of the child ear
The frequency c/λ where c = speed of sound = 343 m/s
hence the child's audible range is multiples of 343/(4*0.13) =6600Hz
or 13200 Hz or 19,800 Hz
The generally quoted range of human hearing is 20 Hz to 20 kHz
