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I am Lyosha [343]
2 years ago
5

A helium-neon laser beam has a wavelength in air of 633 nm. It takes 1.38 ns for the light to travel through 32.0 cm of an unkno

wn liquid. What is the wavelength of the laser beam in the liquid?
Physics
1 answer:
Vera_Pavlovna [14]2 years ago
4 0

Answer:

Wavelength = 489.52 nm

Explanation:

Given that the wavelength of the light = 633 nm

The time taken by the light in unknown liquid = 1.38 ns

Also,

1 ns = 10⁻⁹ s

So, t = 1.38 × 10⁻⁹ s

Also,

Distance = 32.0 cm = 0.32 m ( 1 cm = 0.01 m)

<u>So, speed of the light in the liquid = Distance / Time = 0.32 / 1.38 × 10⁻⁹ m/s = 2.32 × 10⁸  m/s</u>

Frequency of the light does not change when light travels from one medium to another. So,

\frac {V_{air}}{\lambda_{air}}=\frac {V_{liquid}}{\lambda_{liquid}}

{V_{air}}=3\times 10^8\ m/s

{\lambda_{air}}=633\ nm

{V_{liquid}}=2.32\times 10^8\ m/s

{\lambda_{liquid}}=?\ nm

So,

\frac {3\times 10^8\ m/s}{633\ nm}=\frac {2.32\times 10^8\ m/s}{\lambda_{liquid}}

<u>Wavelength = 489.52 nm</u>

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Answer:

The horse is going at 12.72 m/s speed.

Explanation:

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s=ut+\frac{1}{2}at^{2}

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7 0
3 years ago
Need Help !
Bad White [126]

Answer: 5.96m/s

Explanation:

Given the following :

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Final Velocity =?

Final kinetic energy = Initial kinetic energy + work done by engine

Initial kinetic energy = 0.5 × mass × velocity^2

Initial kinetic energy = 0.5 × 1500 × 5.25^2

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Work done by engine = Force × distance

Work done by engine = 1250 × 4.8 = 6000J

Final kinetic energy = (20671.875 + 6000) J

= 26671.875 J

From kinetic energy = 0.5mv^2

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v = sqrt(35.5625)

v = 5.96m/s

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Explanation:

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