What is the name for a star and planets held together by gravity? A. solar system B. galaxy C. black hole D. supernova

When light goes from one material into another material having a HIGHER index of refractionA) its speed decreases but its wavele

Mnenie [13.5K]

Answer:

E) its speed and wavelength decrease, but its frequency stays the same

Explanation:

First of all, the frequency of a light wave does not depend on the medium, while wavelength and speed do. Therefore, the frequency remains costant.

In particular, the speed of light in a medium is given by:

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

where c is the speed of light in a vacuum and n is the index of refraction. From the formula, we see that v and n are inversely proportional: so, when the light moves into a material with higher index of refraction, its speed decreases.

Moreover, speed is related to wavelength by

$v=\lambda f$

where $\lambda$ is the wavelength and f is the frequency. Since the two quantities are directly proportional, this means that since the speed decreases, the wavelength decreases as well.

So, the correct choice is

E) its speed and wavelength decrease, but its frequency stays the same

5 0

3 years ago

Read 2 more answers

If 5kg Stone and 1kg stone throw the from the building which will land more fa ster and why?

sweet [91]

Answer:

Both stones will land at the same time because both stones will fall with the same acceleration through the same height.

Explanation:

We are given that

Mass of stone ,m1=5 Kg

Mass of stone, m2=1 kg

We have to find which stone more faster will land and why.

$h=u+\frac{1}{2}gt^2$

Initial velocity of both stones=0

$h=\frac{1}{2}gt^2$

$t^2=\frac{h}{g}$

$t=\sqrt{\frac{h}{g}}$

$t_1=t_2=\sqrt{\frac{h}{g}}$

Because both stones are thrown from the same height.

Both stones will land at the same time because both stones will fall with the same acceleration through the same height and the acceleration does not depend of its mass.

5 0

3 years ago

I feel like I’ve been on this physics exam forever… please help . NO LINKS.

sesenic [268]

Explanation:

my guess is A

emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to an atom or molecule making a transition from a high energy state to a lower energy state.

4 0

3 years ago

A point charge of +3 C is located at the origin of a coordinate system and a second point charge of -6 C is at x = 1.0 m. At w

Butoxors [25]

Answer:

The point at which the electrical potential is zero is x = +0.33 m.

Explanation:

By definition the electrical potential is:

$V_{E} = \frac{K*q}{r}$