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frosja888 [35]
3 years ago
10

Please help me with these 2 questions :D

Physics
2 answers:
Pepsi [2]3 years ago
7 0

Answer:

Explanation:

1- incident ray

2- the substance through which the wave travels

antoniya [11.8K]3 years ago
6 0

Answer: the incident ray(the incident ray is the ray striking the mirror at the point of incidence while the refracted ray is the ray leaving the mirror)

The substance through which the ray or wave travels.

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The human ear canal is about 2.9 cm long and can be regarded as a tube open at one end and closed at the eardrum. What is the fu
solniwko [45]

The frequency of the human ear canal is 2.92 kHz.

Explanation:

As the ear canal is like a tube with open at one end, the wavelength of sound passing through this tube will propagate 4 times its length of the tube. So wavelength of the sound wave will be equal to four times the length of the tube. Then the frequency can be easily determined by finding the ratio of velocity of sound to wavelength. As the velocity of sound is given as 339 m/s, then the wavelength of the sound wave propagating through the ear canal is  

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As length of the ear canal is given as 2.9 cm, it should be converted into meter as follows:

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