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
zhenek [66]
3 years ago
11

Stars are classified mainly according to their distance from Earth.

Physics
1 answer:
Zielflug [23.3K]3 years ago
4 0
 The answer is b) false. Stars are mainly classified by their spectra (the elements they absorb) and their temperature.
You might be interested in
You are asked to build an LC circuit that oscillates at 13 kHz. In addition, you are told that the maximum current in the circui
inessss [21]

Answer:

a)L=0.00142H

b) C=2.65*10^{-12}

Explanation:

From the question we are told that:

FrequencyF=13kHz

Current I=0.14A

CapacitorC_e=1.4*10^{-5}J

Generally the equation for Energy in the inductor is mathematically given by

Where L is now subject

L=\frac{2C_e}{I^2}

L=\frac{2*1.4*10^{-5}}{(0.14)^2}

L=0.00142H

Generally the equation for Value of Capacitor is mathematically given by

C=\frac{1}{(2 \pi f)^2} L

C=\frac{1}{(2 3.142 13*10^3Hz)^2} *0.00142

C=2.65*10^{-12}

3 0
3 years ago
Compare blue and red light from the visible spectrum. which has: the longer wavelength? the greater frequency? the greater energ
Hitman42 [59]
1) By looking at the table of the visible spectrum, we see that blue light has a wavelength in the range [450-490 nm], while red light has wavelength in the range [620-750 nm]. Therefore, red light has longer wavelength than blue light.

2) The frequency f of an electromagnetic wave is related to its wavelength \lambda by the formula
f= \frac{c}{\lambda}
where c is the speed of light. We see that the frequency is inversely proportional to the wavelength, so the shorter the wavelength, the greater the frequency. In this case, blue light has shorter wavelength than red light, so blue light has greater frequency than red light.

3) The energy of the photons of an electromagnetic wave is given by
E=hf
where h is the Planck constant and f is the frequency. We see that the energy is directly proportional to the frequency, so the greater the frequency, the greater the energy. In this problem, blue light has greater frequency than red light, so blue light has also greater energy than red light.
6 0
3 years ago
Physical Science Lesson 4 unit 2 questions, I need the answers
neonofarm [45]
I know I'm a bit late but just in case you still need some of the answers.

1: Oxygen
2: Change in shape
3: Water breaking down into hydrogen and oxygen
4: I think it's Milk but I might be wrong.

I might be wrong about some of them, sorry it's not much.

7 0
4 years ago
Read 2 more answers
ASAP!! PLZZ HELP ME
kozerog [31]
The brush passes current from a power source into the commutator.  Therefore they both must carry electric current, B
4 0
3 years ago
Read 2 more answers
Two cyclists start at the same point, but travel along two straight streets in different directions. if they continue, how many
Mumz [18]

Since they are travelling on two different straight directions, therefore their paths will NEVER cross again. This because straight lines will keep on going forever on the same direction therefore there is 0 possibility for two straight lines to paths cross again.

 

Answer:

<span>zero or never</span>

8 0
3 years ago
Other questions:
  • What Exactly is specific heat?
    5·1 answer
  • Equal amounts of water are kept in a cap and in a dish which will evaporate faster ?why
    6·2 answers
  • Why do cities located in the west have different climates and temperatures in the east cities?
    7·1 answer
  • Organelles are the tiny structures in cells that carry out life processes. True or False
    6·2 answers
  • Convert 120 Kelvin to Fahrenheit​
    6·2 answers
  • A wall clock has a minute hand with a length of 0.55 m and an hour hand with a length of 0.26 m. Take the center of the clock as
    8·1 answer
  • Which is true about a surface wave?
    8·1 answer
  • An electron is released from rest in a uniform electric field and accelerates to the east at a rate of 4x106m/s2. What is the ma
    9·1 answer
  • The motion of a parachuists isn't considered free fall? give reason
    5·1 answer
  • A piece of fine fiber with a diameter of =6.5 m is used to prop apart the edges of two perfectly flat 3.3-cm-long pieces of glas
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!