1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ede4ka [16]
2 years ago
12

PLEASE HELP! TRUE OR FALSE!

Physics
2 answers:
SpyIntel [72]2 years ago
8 0

Answer:

<h3>About the firs question.</h3>

The first statement is completely true. An image is attached. You can observe than a concave mirror like it's shown, the focal points is on the optic axis, and all rays converge in that point.

<h3>About the second question.</h3>

<em>A dispersive medium refers to mediums where waves of different frequencies travel at different velocities. </em>In addition, the relation between frequency and degree of refraction of the medium is that waves with lower frequency will bend less when passing through the dispersive medium. For example, if we pass a red light through a medium, and then we pass a violet light, we'll see the difference in the angle of refraction, the violet light will bend more than the red one.

Therefore, the answer to the second question is "<em>dispersive media waves of high frequency refract more than waves of low frequency do".</em>

<em />

<h3>About the third question.</h3>

The reason why Roemer's measurement of the speed of light was inaccurate is:<em> "He did not know the accurate diameter of the Earth's orbit".</em>

At that time, during 1668-1674, the diameter of Earth's orbit wasn't accurate, which added error of delay to his Roemer's measurement. However, he was the first scientist in deduct a finite speed of light, before him, it was known that the speed of light was infinite.

<h3>About the fourth question.</h3>

For convex lenses we have the relation between distances and highnesses:

\frac{d_{o} }{d_{i} }=\frac{h_{o}}{h_{i}}

We have:

f=10.0 \ cm

d=5.0 \ cm

h_{o}=3.0 \ cm

So, we can deduct that the object is d_{o}=15.0 \ cm away from the lens. But, we need to calculate the distance of the image d_{i} with this relation:

\frac{1}{f}=\frac{1}{d_{o} } +\frac{1}{d_{i} }

Replacing all values, we have:

\frac{1}{10}=\frac{1}{15}  +\frac{1}{d_{i}}\\\frac{1}{10}-\frac{1}{15} =\frac{1}{d_{i}}\\\frac{1}{d_{i}}=\frac{15-10}{150}=\frac{5}{150}\\d_{i}=\frac{150}{5}=30

Now, we can calculate the highness of the image:

\frac{d_{o} }{d_{i} }=\frac{h_{o}}{h_{i}}\\\frac{15}{30}=\frac{3}{h_{i}}\\h_{i}=\frac{3(30)}{15}=6

Therefore, the image height is 6 centimetres.

Fed [463]2 years ago
4 0
For the first true or false question, it is true.
You might be interested in
1.
Cloud [144]

Answer:

broom

Explanation:

8 0
2 years ago
What effect does an unbalanced force have on an object?
Mars2501 [29]
<span>it either changes the direction of the object or it stops the object in motion.</span>
5 0
3 years ago
Read 2 more answers
Food and water are examples of _______ for populations.
Law Incorporation [45]
Needs................


8 0
2 years ago
Read 2 more answers
How much mass would pizza dough have after you flatten it
mars1129 [50]

Answer:

the answer is that the dough has the same mass before and after it was flattened

3 0
2 years ago
Read 2 more answers
A bicycle wheel of radius 0.70 m is rolling without slipping on a horizontal surface with an angular speed of 2.0 rev/s when the
aleksandrvk [35]

Answer:

θ= 5 radian

Explanation:

Given data:

Radius r = 0.70 m

Initial angular speed ω_i = 2rev/s

Time t = 5 s

Final angular speed ω_f =0

so we have angular displacement

\theta= \frac{\omega_f-\omega_i}{2}\times t

putting values

\theta= \frac{0-2}{2}\times5 = 5 rad

8 0
3 years ago
Other questions:
  • Two children use a homemade "telephone" consisting of two paper cups attached by an aluminum wire which is 8.4 m long. Determine
    14·1 answer
  • A wood block is sliding up a wood ramp. if the ramp is very steep, the block will reverse direction at its highest point and sli
    14·1 answer
  • This is a model of a Chlorine atom. How likely is it that this atom would want to bond with another atom? Chlorine atom Question
    13·1 answer
  • A care package is dropped from an airplane flying at 1000 m above sea level with a velocity of 200 m/s to an island. If it takes
    13·1 answer
  • Two physical pendulums (not simple pendulums) are made from meter sticks that are suspended from the ceiling at one end. The sti
    7·1 answer
  • An electron is travelling East through a magnetic field directed South. In which direction is the force on the electron?
    15·1 answer
  • HELP PLEASE!! GIVING BRAINLIEST!! If you answer this correctly ill answer some of your questions you have posted! (20pts)
    5·2 answers
  • An experiment is designed to investigate the relation between the pressure and temperature in a tank that has a constant volume
    5·1 answer
  • Do you think antiseptic creams and lotions play an important part in our day<br>to day life? ​
    7·2 answers
  • Can you guys help me please <br>brainliest if correct answer​
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!