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3 years ago

Which best describes reflection and refraction?

1 answer:

7 0

Refraction is when it is broken light, or how much propagating waves are bent. Reflection is light bouncing off of an object and being transferred somewhere else, like a flashlight on a mirror whose light is seen on the ceiling.

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What type of reaction is being shown in this energy diagram?

denis-greek [22]

Answer:

im 95% sure the answer is d

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2 years ago

The highest frequency radio waves are which type ?

Zolol [24]

Answer: Gamma rays

Explanation: Gamma rays have the highest energies, the shortest wavelengths, and the highest frequencies.

7 0

3 years ago

Astronomers have recently observed stars orbiting at very high speeds around an unknown object near the center of our galaxy. Fo

nataly862011 [7]

Answer:

<em>The mass of the object is 745000 units of the sun</em>

Explanation:

We know that the centripetal force with which the stars orbit the object is represented as

$F_{c}$ = $\frac{mv^{2} }{r}$

and this centripetal force is also proportional to

$F_{c}$ = $\frac{kMm}{r^{2} }$

where

m is the mass of the stars

M is the mass of the object

v is the velocity of the stars = 10^6 m/s

r is the distance between the stars and the object = 10^14 m

k is the gravitational constant = 6.67 × 10^-11 m^3 kg^-1 s^-2

We can equate the two centripetal force equations to give

$\frac{mv^{2} }{r}$ = $\frac{kMm}{r^{2} }$

which reduces to

$v^{2}$ = $\frac{kM}{r}$

and then finally

M = $\frac{rv^{2} }{k}$

substituting values, we have

M = $\frac{10^{14}*(10^{6})^{2} }{6.67*10^{-11} }$ = 1.49 x 10^36 kg

If the mass of the sun is 2 x 10^30 kg

then, the mass of the the object in units of the mass of the sun is

==> (1.49 x 10^36)/(2 x 10^30) = <em>745000 units of sun</em>

6 0

3 years ago

A certain sound is recorded by a microphone. The same microphone then detects a second sound, which is identical to the first on

olya-2409 [2.1K]

Answer:

It is perceived as louder.

Explanation:

Amplitude affects the loudness of sound.

Frequency and wavelength affect the pitch of the sound.

3 0

3 years ago

Explain why gases are more compressible than solid

Oduvanchick [21]

Answer:

If we put pressure on a solid or a liquid, there is essentially no change in volume. ... The kinetic-molecular theory explains why gases are more compressible than either liquids or solids. Gases are compressible because most of the volume of a gas is composed of the large amounts of empty space between the gas particles.

Explanation:

7 0

3 years ago