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wlad13 [49]
3 years ago
10

A ray of light crosses a boundary between two transparent materials. The medium the ray enters has a larger index of refraction.

Which of the following statements are true?
a) The wavelength of the light increases as it transitions between materials
b) The speed of the light remains constant as it transitions between materials.
c) The frequency of the light remains constant as it transitions between materials.
d) The wavelength of the light decreases as it enters into the medium with the greater index of refraction.
e) The wavelength of the light remains constant as it transitions between materials.
f) The speed of the light decreases as it enters into the medium with the greater index of refraction.
g) The frequency of the light decreases as it enters into the medium with the greater index of refraction.
h) The frequency of the light increases as it enters into the medium with the greater index of refraction.
i) The speed of the light increases as it enters the medium with the greater index of refraction.
Physics
1 answer:
Liula [17]3 years ago
7 0

The wavelength of the light decreases as it enters into the medium with the greater index of refraction. The wavelength of the light remains constant as it transitions between materials.

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Answer:

a.2.5x 10^3 m/s

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Explanation:

A rocket is moving away from the solar system at a speed of 7.5 ✕ 103 m/s. It fires its engine, which ejects exhaust with a speed of 5.0 ✕ 103 m/s relative to the rocket. The mass of the rocket at this time is 6.0 ✕ 104 kg, and its acceleration is 4.0 m/s2. What is the velocity of the exhaust relative to the solar system? (B) At what rate was the exhaust ejected during the firing?

velocity of the exhaust relative to the solar system

velocity of the rocket -velocity of the exhaust relative to the rocket.

7.5 ✕ 103 m/s-5.0 ✕ 103 m/s

2.5x 10^3 m/s

. b  we will look for the thrust of the rocket

T=ma

T=6.0 ✕ 104 kg*4.0 m/s2

T=2.4*10^5N

f=mass rate *velocity of the exhaust

T=2.4*10^5N=mr*5.0 ✕ 10^3 m/s

mr=2.4*10^5N/5.0 ✕ 10^3

mr=48kg/s

5 0
3 years ago
What happens to the speed of an object when you increase or decrease force?
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Two 75 W (120 V) lightbulbs are wired in series, then the combination is connected to a 120 V supply. Part A How much power is d
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Answer:

<em>300 W</em>

<em></em>

Explanation:

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we know that electrical power P = IV    ....1

and V = IR

we can also say that I = V/R

substituting for I in  equation 1, we have

P = V^{2}/R    ....2

The total total power in the circuit = 75 x 2 = 150 W

from equation 2, we have

150 = 120^{2} /R

R = 120^{2}/150 = 96 Ω    this is the resistance of the whole circuit.

This resistance is due to the two light bulbs, for each light bulb since they are arranged in series

R = 96/2 = 48 Ω

From P =  V^{2}/R  

for each light bulb, power is

P = 120^{2} /48 = <em>300 W</em>

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jeka94
<h2>FAULT</h2>

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