All categories

3 years ago

ASAP!!! Explain: Why do black lines appear on the absorption spectrum of the sun?

1 answer:

3 0

The black lines in the Sun's spectrum are caused by gases on, or above, the Sun's surface that absorb some of the emitted light.

You might be interested in

A ball is dropped from a height of 1.20 m and hits the floor. The ball compresses and then reforms to spring upwards from the fl

diamong [38]

Answer:

$\large \boxed{\text{98 m$\cdot$s}^{-2}}$

Explanation:

The formula for the velocity of the ball is

$v = \sqrt{2gh}$

1. Velocity at time of impact

$v = -\sqrt{2 \times 9.807 \times 1.20} = -\sqrt{23.54} = -\textbf{4.85 m/s}$

2. Velocity on rebound

The ball has enough upward velocity to reach a height of 0.86 m.

$v = \sqrt{2 \times 9.807 \times 0.86} = \sqrt{16.87} =\textbf{4.11 m/s}$

3. Acceleration

$a = \dfrac{\Delta v}{\Delta t} = \dfrac{4.11 - (-4.85)}{ 0.091} = \dfrac{8.96 }{0.091} =\textbf{98 m$\cdot$s}^{\mathbf{-2}}\\\\\text{The acceleration while the ball is in contact with the floor is $\large \boxed{\textbf{98 m$\cdot$s}^{\mathbf{-2}}}$}$

5 0

4 years ago

How are atoms of the same element with different mass numbers called?

ELEN [110]

Answer:

Isotopes

Explanation:

Isotopes are the same element with different masses because of the different number of neutrons. Also, the element doesn't change. If we change the protons, the element will change and then it won't be an isotope. Hope it helps!

7 0

3 years ago

Write this measurement in scientific notation: 0.000130 L

oksano4ka [1.4K]

Answer:1.30 x 10 to the 4th

Explanation:

Just know

3 0

4 years ago

20. 6th-grade question

Yuki888 [10]

Answer:

D. visible light and the electromagnetic spectrum

have a small area of overlap.

Explanation:

you have to look careful in answering questions you could end up right or wrong, on these answers are very important to know, and I am always right with these answer's

7 0

3 years ago

Which statement correctly describes electrochemical cells?

hoa [83]

Answer: C. Electrochemical cells involve oxidation-reduction reactions.

Explanation: Oxidation occurs at the anode, and reduction occurs at the cathode.

3 0

3 years ago