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kogti [31]
3 years ago
9

What causes the phenomenon of "red shift" and "blue shift" in astronomy? *

Physics
2 answers:
faltersainse [42]3 years ago
6 0

Answer:

doppler effect

Explanation:

prohojiy [21]3 years ago
5 0

The entire scientific Astronomical and Cosmological community assumes that it's the Doppler effect, since that's the only existing scientific explanation for the shifts in wavelengths away from what they're supposed to be.  The whole theoretical structure of the "Big Bang" and the expanding universe is built on that understanding.

If anybody ever comes along and discovers another way for electromagnetic waves to get longer or shorter on their way to us through space, then the whole big bang and expanding universe may be out the window.

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Which of the given will facilitate a normal Diels–Alder reaction?
babymother [125]

Answer:

D

Explanation:

-  The rate of the Diels-Alder is orders of magnitude faster if there is an electron-withdrawing group on the dienophile. For example, replacing a hydrogen on ethene with the electron-withdrawing group CN results in about a 10^5 increase in the reaction rate.

- Other common electron withdrawing functional groups that will accelerate the Diels Alder reaction of dienophiles include aldehydes, ketones, and esters.

- In short, any functional group conjugated with the pi bond which can act as a pi acceptor will accelerate a Diels-Alder reaction with a typical diene.

- See attachment for graphical explanation.

7 0
3 years ago
how much time would it take for the sound of a thunder to travel 1,500 meters if sound travelers at a speed of 330 m/sec?
inysia [295]

(1,500 meters) x (1 sec/330 meters) =

(1,500 / 330) (meters-sec/meters) =

4.55 seconds

8 0
3 years ago
9. If the frequency of a certain light is 3.8 x 10<br> Hz, what is the energy of this light?
ddd [48]

Answer:

E = h*f = (6.63*10^-34) *( 3.8*10)

E = 2.5 *10^-32

Explanation:

e= Energy

h = Planck's constant

f = frequency

8 0
3 years ago
Hiw do we have day and night cycles? What is the speed of light?How and Why do we have seasons? Please answer ​
Ratling [72]

Answer:

1. Earth rotates on its axis; this causes us to experience day and night.

2. The speed of light is 186000 miles per second

3. The four seasons happen because of the tilt of the Earth's axis. At different times of the year, the sun's rays hit different parts of the globe more directly. The angle of the Earth's axis tilts the Northern Hemisphere towards the sun during the summer.

Explanation:

8 0
3 years ago
Read 2 more answers
The magnitude of the electrical force acting between a +2.4 × 10–8 C charge and a +1.8 × 10–6 C charge that are separated by 0.0
monitta
Use Coulomb law: F = k * q1*q2 / (r^2), where k = 9.00 * 10^9 N.m^2/C^2

F = 9.00 * 10^9 N.m^2/C^2 * 2.4*10^-8 C * 1.8*10^-6 C / [0.008m]^2 = 38.88 * 10^ -5 N

F = 39 * 10 -5N


4 0
3 years ago
Read 2 more answers
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