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
cricket20 [7]
4 years ago
8

In the history of astronomy, which of the following is true? . A] Tycho Brahe built one of the first observatories. B] Ptolemy w

as criticized for his work on the heliocentric model. C] Nicolaus Copernicus argued that the sun was the center of the universe. .D] Johannes Kepler argued that Earth was the center of the universe. . .
Physics
2 answers:
matrenka [14]4 years ago
6 0

Answer: C] Nicolas Copernicus argued that the sun was the center of the universe.

Explanation:  

The first observatory was built for Tycho Brahe, a Danish astronomer on the island of Hven by King Frederick II of Denmark. Ptolemy supported the geocentric model which considered Earth to be at the center of the universe. Johannes Kepler supported the heliocentric model.

Thus, the only true statement from the given options is that Nicolas Copernicus argued that the Sun was the center of the universe. He proposed the Heliocentric model. He believed the Sun to be the center and every other object - planets , stars revolved about the Sun.

Gelneren [198K]4 years ago
4 0
D. <span>Johannes Kepler argued that Earth was the center of the universe.

</span>
You might be interested in
What are the 3 parts of an atom and give the electric charge of each
xeze [42]
Proton  
charge +

electron 
charge -

neutron
charge neutral
3 0
3 years ago
Witch type of radio station can broadcast a signal the gratis distance
Nana76 [90]
AM radio stations I believe
6 0
3 years ago
Which property of sugar makes it different from white crystalline sand?
yaroslaw [1]

Answer:

The property of sugar which makes it different from sand is that sugar can dissolve in water. Explanation: however the power of dissolving of sand is not present. This is due to the presence of interaction between sugar and water.

Explanation:

I hope that was useful

5 0
3 years ago
When light of wavelength 240 nm falls on a cobalt surface, electrons having a maximum kinetic energy of 0.17 eV are emitted. Fin
dusya [7]

Answer:

(a) 5.04 eV (B) 248.14 nm (c) 1.21\times 10^{15}Hz

Explanation:

We have given Wavelength of the light  \lambda = 240 nm

According to plank's rule ,energy of light

E = h\nu = \frac{hc}{}\lambda

E = h\nu = \frac{6.67\times 10^{-34} J.s\times 3\times 10^{8}m/s}{ 240\times 10^{-9} m\times 1.6\times 10^{-19}J/eV}= 5.21 eV

Maximum KE of emitted electron i= 0.17 eV

Part( A) Using Einstien's equation

E = KE_{max}+\Phi _{0}, here \Phi _0 is work function.

\Phi _{0}=E - KE_{max}= 5.21 eV-0.17 eV = 5.04 eV

Part( B) We have to find cutoff wavelength

\Phi _{0} = \frac{hc}{\lambda_{cuttoff}}

\lambda_{cuttoff}= \frac{hc}{\Phi _{0} }

\lambda_{cuttoff}= \frac{6.67\times 10^{-34} J.s\times 3\times 10^{8}m/s}{5.04 eV\times 1.6\times 10^{-19}J/eV }=248.14 nm

Part (C) In this part we have to find the cutoff frequency

\nu = \frac{c}{\lambda_{cuttoff}}= \frac{3\times 10^{8}m/s}{248.14 \times 10^{-19} m }= 1.21\times 10^{15} Hz

5 0
3 years ago
A stone is thrown vertically upwards with an initial velocity of 20m/sec. Find the maximum height ot reaches and the time taken
MAXImum [283]

Answer:

The height reached is 20m, The time taken to reach 20m is 2 seconds

Explanation:

Observing the equations of motion we can see that the following equation will be most helpful for this question.

v^{2} = u^{2} + 2as

We are given initial velocity, u

We know that the stone will stop at its maximum height, so final velocity, v

Acceleration, a

And we are looking for the displacement (height reached), s

Substitute the values we are given into the equation

0^{2} = 20^{2} + 2(10)s

Rearrange for s

0^{2} -20^{2} =20s

-400=20s

\frac{-400}{20} =s

s = -20 (The negative is just showing direction, it can be ignored for now)

The height reached is 20m

Use a different equation to find the time taken

s = vt - \frac{1}{2} at^{2}

Substitute in the values we have

-20=(0)t - \frac{1}{2} (10)t^{2}

Rearrange for t

-20 =0 -5 t^{2}

\frac{-20}{-5} =t^{2}

4 = t^{2}

t = 2s

The time taken to reach 20m is 2 seconds

4 0
3 years ago
Other questions:
  • Lien uses a spring scale to pull a block toward the right across the lab table. The scale reads 8 N. Which force should Lien con
    15·2 answers
  • What are the primary methods by which planets have been found around other stars in our galaxy
    12·1 answer
  • What is the acceleration of a 5 kg mass pushed by a 10 n force?
    8·2 answers
  • A cyclist is traveling at 10m/s when he comes to a hill. He stops pedaling at the bottom of the hill and lets the bicycle coast
    11·1 answer
  • If a neutral object such as paper comes close to a positively charged plastic rod, what type of charge accumulates on the side o
    14·2 answers
  • What happens to the electrons when you rub a balloon in your hair
    13·1 answer
  • In the early 1900s many scientists thought that an atom consisted of a positive substance with negative charges scattered throug
    12·1 answer
  • Radioactive iodine (radioiodine) is given to patients with some forms of thyroid cancer in order to destroy the cancer cells. 13
    5·1 answer
  • The law of inertia states that a moving object will:.
    7·1 answer
  • What is the primary way the metamorphic rock formed
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!