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2 years ago

Question )

Physics

2 answers:

frozen [14]2 years ago

8 0

Answer:

1.042 × 10⁻³ m/s

Explanation:

average speed = $\frac{total \space\ distance \space\ covered}{time \space\ taken}$

In this case,

• distance covered = 90 m,

• time taken = 24 hours = 24 × 60 = 1440 min = 1140 × 60 = 86400 s

Substituting these values into the formula:

average speed = $\frac{90}{86400}$

= 1.042 × 10⁻³ m/s

Verdich [7]2 years ago

6 0

Answer:

3.75 meters per hour

Explanation:

$\boxed{\sf Speed = \dfrac{Distance}{Time}}$

Given:

Distance = 90 meters
Time = 24 hours

Substitute the given values into the formula to calculated the speed:

$\implies \sf Speed = \dfrac{90\:m}{24\:h}$

$\implies \sf Speed = 3.75\:m/h$

Therefore, the average speed of the snail is 3.75 meters per hour.

To calculate the speed in meters per minute, divide by 60:

$\implies \sf Speed = \dfrac{3.75\:m/h}{60}=0.0625\:m/min$

To calculate the speed in meters per second, divide by 60 again:

$\implies \sf Speed = \dfrac{0.0625\:m/min}{60}=0.001042\:m/s\:\:(4\:s.f.)$

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e-lub [12.9K]

(a) $4.74\cdot 10^14 Hz$

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In this problem, we have laser light with wavelength

$\lambda=632.8 nm=6.33\cdot 10^{-7} m$ . Substituting into the formula, we find its frequency:

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(b) 427.6 nm

The wavelength of an electromagnetic wave in a medium is given by:

$\lambda=\frac{\lambda_0}{n}$

where

$\lambda_0$ is the original wavelength in a vacuum (approximately equal to that in air)

$n$ is the index of refraction of the medium

In this problem, we have

$\lambda_0=632.8 nm$

n = 1.48 (index of refraction of glass)

Substituting into the formula,

$\lambda=\frac{632.8 nm}{1.48}=427.6 nm$

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The speed of an electromagnetic wave in a medium is

$v=\frac{c}{n}$

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Since in this problem n=1.48, we find

$v=\frac{3\cdot 10^8 m/s}{1.48}=2.03\cdot 10^8 m/s$

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Answer:

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Explanation:

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3 years ago

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3 years ago

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