4 years ago

The rotational speed of earth is similar to?

Physics

1 answer:

m_a_m_a [10]4 years ago

8 0

Actually, the speed of the earth is the same everywhere, taking the angular speed as the valid measure of the speed

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What is the wavelength of a wave whose velocity is 8 m/s and frequency is 2 waves/second?

Maru [420]

Wavelength = (speed) / (frequency)

Wavelength = (8 m/s) / (2/s)

Can you finish it off from this point ?

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4 years ago

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3 years ago

Consider that a ray of light is travelling from glass to water. The refractive index of water is 1.30 (i e n . ., 1.30 w = ) and

Bess [88]

Answer:

$\theta_i=49.88^{\circ}$

Explanation:

Total internal reflection can happen when light goes from a medium with higher refractive index (in this case, glass) to a medium with lower refractive index (in this case, water).

Snell's Law tells us that $n_isin\theta_i=n_rsin\theta_r$ , where the i stands for incident (in this case, glass) and the r for refracted (in this case, water). We want to know when $\theta_r=90^{\circ}$ , that is, when $n_isin\theta_i=n_r$ , and this happens when the incident angle is: