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strojnjashka [21]
3 years ago
6

URGENT!!!! WILL GIVE BRAINLIEST!!!!!! 15 POINTS

Physics
2 answers:
sweet [91]3 years ago
7 0
You've got the whole answer right there in your question. The angle of incidence is the angle between the line normal to the surface and the beam of light coming into the surface. (Normal means perpendicular.)
Artyom0805 [142]3 years ago
3 0
It's the angle made by the incident ray when it's perpendicular to the surface. (Perpendicular lines are the lines that form a graph or like a 90-degree angle)
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A group of hikers hear an echo 3.3 s after they shout. The temperature is 20◦C.
romanna [79]

Answer:

560 m

Explanation:

The speed of sound in air is approximately:

v ≈ v₀ + 0.6T

where v₀ is the speed of sound at 0°C (273 K) in m/s, and T is the temperature in Celsius.

The speed of sound at 20°C at that altitude is:

v ≈ 327 + 0.6(20)

v ≈ 339 m/s

The sound travels from the hikers to the mountain and back again, so it travels twice the distance.

339 m/s = 2d / 3.3 s

2d = 1118.7 m

d = 559.35 m

Rounding, the mountain is approximately 560 m away.

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