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
Assoli18 [71]
2 years ago
13

What important change in the atmosphere occurred during the Proterozoic Eon?

Physics
1 answer:
melisa1 [442]2 years ago
3 0
Proterozoic Eon, the younger of the two divisions of Precambrian time, the older being the Archean Eon.

D. Methane levels decreased and oxygen levels increased, promoting aerobics life forms

Brainlessly answer pls
You might be interested in
A scientist bred fruit flies in two separate containers with different food sources for many generations. When she put the fruit
Nookie1986 [14]
Fruit flies prefer mates adapted to the same food source.

3 0
3 years ago
Read 2 more answers
Why does of beam of light ben when it passes into a new medium?
Pachacha [2.7K]

Answer:

The bending occurs because light travels more slowly in a denser medium.

3 0
3 years ago
The work function for a metal surface is 4.98 eV. What is the largest wavelength of light in nm that will produce photoelectrons
bulgar [2K]

Answer:\lambda =248.99 nm

Explanation:

Given

Work function\left ( \phi \right )=4.98\approx 1.602\times 10^{-19}\times 4.98

h=6.626\times 10^{-34} J

c=2.998\times 10^8

\phi =\frac{hc}{\lambda }

\lambda =\frac{hc}{\phi }

\lambda =\frac{6.626\times 10^{-34}\times 2.998\times 10^8}{4.98\times 1.602\times 10^{-19}}

\lambda =248.99 nm

3 0
3 years ago
A parallel-plate capacitor with plates of area 600 cm^2 is charged to a potential difference V and is then disconnected from the
Julli [10]

Answer:

<h2>a) Q = 0.759µC</h2><h2>b) E = 39.5µJ</h2>

Explanation:

a) The charge Q on the positive charge capacitor can be gotten using the formula Q = CV

C = capacitance of the capacitor (in Farads )

V = voltage (in volts) = 100V

C = ∈A/d

∈ = permittivity of free space = 8.85 × 10^-12 F/m

A = cross sectional area = 600 cm²

d= distance between the plates = 0.7cm

C = 8.85 × 10^-12 * 600/0.7

C = 7.59*10^-9Farads

Q = 7.59*10^-9 * 100

Q = 7.59*10^-7Coulombs

Q = 0.759*10^-6C

Q = 0.759µC

b) Energy stored in a capacitor is expressed as E = 1/2CV²

E = 1/2 * 7.59*10^-9 * 100²

E = 0.0000395Joules

E = 39.5*10^-6Joules

E = 39.5µJ

7 0
2 years ago
Frequency of the wave below?
agasfer [191]

It's hard to tell exactly what's happening in that 110 cm that you marked over the wave. What is under the ends of the long arrow ? How many complete waves ? I counted 4.5 complete waves ... maybe ?

If there are 4.5 complete waves in 110cm, then the length of 1 wave is (110/4.5)=24.44cm.

Frequency = speed/wavelength

Frequency = 2m/s /0.2444m

Frequency = 8.18 Hz

6 0
3 years ago
Other questions:
  • On James’s MP3 player, he has 12 sad songs and 40 upbeat songs that he wants to put into playlists. He wants to have the same nu
    7·2 answers
  • What is the horizontal component of the force on the ball after it leaves the throwers hands
    7·1 answer
  • PLEASE HELP ):
    10·1 answer
  • Atoms in a solid are not stationary, but vibrate about their equilibrium positions. Typically, the frequency of vibration is abo
    10·1 answer
  • Blood contains positive and negative ions and therefore is aconductor. A blood vessel, therefore, can be viewed as anelectrical
    11·1 answer
  • Two small objects each with a net charge of +Q exert a force of magnitude F on each other. We replace one of the objects with an
    8·1 answer
  • Mamie clark was a psychologist who is known for her research on ?
    15·2 answers
  • It takes 29.53 days for the Moon to rotate around Earth. What would happen if the Moon does not rotate or rotates faster than it
    6·1 answer
  • Please help me answer
    13·2 answers
  • Lets see how many go her just for the money
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!