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Eddi Din [679]
3 years ago
7

Which of the following questions could best be answered by the work of Christian Doppler?

Physics
2 answers:
Nina [5.8K]3 years ago
8 0
The answer is B
How quickly are the stars in the Milky Way moving away from Earth
Galina-37 [17]3 years ago
3 0

Answer:

Option B

Explanation:

Given are four options and we must select one out of four which could be best answered by the work of Christian Doppler

Mirrors used inside a camera work on the point that light reflects from a mirror depending on the surface of the mirror and hence images formed

Broadband internet service to rural areas is the speed and reliability of the cables connecting internet to rural.

Maximum mass of a stable white dwarf star depends on the material used for making the car.  These three do not depend on doppler effect

But how quickly are stars in the Milky Way moving away from Earth depend on the relative speed of the source and the observer.  Hence in this Doppler effect is applied.

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What are the advantages of parallel circuits? Check all that apply
Bezzdna [24]

Answer:

If one bulb goes out, other bulbs stays lit.

If there is break in one branch of the circuit, current can still flow through other branches.

Parallel circuits are simple to design and build.

Explanation:

In parallel circuits all the components and resistors are connected to common terminal or common supply.

So here if we disconnect one of the branch of the circuit then it will not affect the other branches of the circuit so it will not affect the current of other branches.

So here it is very easy to build a parallel circuit and if one of the branch of the circuit goes out then it will not affect the other branches.

7 0
3 years ago
Read 2 more answers
The cross sectional area of an optical fibre is 6.3 x 10^-6 m^2 The intensity of the light entering the optical fibre is 3.2 x 1
gogolik [260]

the answer is 0.0. also known as a emoji face!

7 0
3 years ago
How does solar energy work
xz_007 [3.2K]

Answer:

When the sun shines onto a solar panel, energy from the sunlight is absorbed by the PV cells in the panel. This energy creates electrical charges that move in response to an internal electrical field in the cell, causing electricity to flow.

4 0
3 years ago
Explain how if a solid, liquid, and gas are put into individual containers how they fill the container.
Sav [38]

Answer:

serial in which container is filled

Solid -base of container

Liquid- above solid

Gas- above liquid

Explanation:

If any mixture of  matter in different state (that solid , liquid or gas )are kept in any container, then substance with higher density will be settled at lowest surface first and similarly the substance with lowest density will be at upper part of container.

In the given container we have to keep solid, liquid and gas

  • sold has the highest density,
  • gas the lowest density and
  • liquid has the density higher than gas but less than solid.

based on this

solid will be at surface of container

above sold will be liquid

above liquid will be presence of Gas

serial in which container is filled

Solid -base of container

Liquid- above solid

Gas- above liquid

8 0
4 years ago
Air (14.5 lb) undergoes a polytropic process in a closed system from p1 = 80 lbf/in2, υ1 = 4 ft3/lb to a final state where p2 =
Yanka [14]
The energy transfer in terms of work has the equation:

W = mΔ(PV)

To be consistent with units, let's convert them first as follows:

P₁ = 80 lbf/in² * (1 ft/12 in)² = 5/9 lbf/ft²
P₂ = 20 lbf/in² * (1 ft/12 in)² = 5/36 lbf/ft²
V₁ = 4 ft³/lbm
V₂ = 11 ft³/lbm

W = m(P₂V₂ - P₁V₁)
W = (14.5 lbm)[(5/36 lbf/ft²)(4 ft³/lbm) - (5/9 lbf/ft²)(11 lbm/ft³)]
W = -80.556 ft·lbf

In 1 Btu, there is 779 ft·lbf. Thus, work in Btu is:
W = -80.556 ft·lbf(1 Btu/779 ft·lbf)
<em>W = -0.1034 BTU</em>


4 0
3 years ago
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