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3 years ago

9

Quasar spectra often show many absorption lines that all appear to be as a result of the same electron transition (such as level

1 to level 2 in hydrogen) but that fall at different wavelengths in the spectrum. Why do we think this is the case?

1 answer:

Elanso [62]3 years ago

5 0

Answer: Because of different redshift of cloud.

Explanation:

We are seeing absorption lines from clouds of gas that lie between us and the quasar, and therefore each cloud has a different redshift.

A quasar's spectrum is hugely redshifted. And most astronomers think this large redshift tells us about the distance to the quasar.

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Describe the 3 main components of work.

nadezda [96]

Work is Force x Distance in the Direction of the force.

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3 years ago

The Mistuned Piano Strings Two identical piano strings of length 0.800 m are each tuned exactly to 480 Hz. The tension in one of

IRINA_888 [86]

Complete Question

The complete question is shown on the first uploaded image

Answer:

The answer is

$T_2 = 1.008$ % higher than $T_1$

$T_2 = 0.99$ % lower than $T_1$

Explanation:

From the question we are told that

The first string has a frequency of $f_1 = 230 Hz$

The period of the beat is $t_{beat} = 0.99s$

Generally the frequency of the beat is

$f_{beat} = \frac{1}{t_{beat}}$

Substituting values

$f_{beat} = \frac{1}{0.99}$

$= 1.01 Hz$

From the question

$f_2 - f_1 = f_{beat}$ for $f_2$ having a higher tension

So

$f_2 - 230 = 1.01$

$f_2 = 231.01Hz$

From the question

$\frac{f_2}{f_1} = \sqrt{\frac{T_2}{T_1} }$

$\frac{T_2}{T_1} = \frac{f_2^2}{f_1^2}$

Substituting values

$\frac{T_2}{T_1} = \frac{(231.01)^2}{(230)^2}$

$T_2 = 1.008$ % higher than $T_1$

For $f_2$ having a lower tension

$f_1 - f_2 = f_{beat}$

So

$230 - f_2 = 1.01$

$f_2 = 230 -1.01$

$= 228.99$

From the question

$\frac{f_2}{f_1} = \sqrt{\frac{T_2}{T_1} }$

$\frac{T_2}{T_1} = \frac{f_2^2}{f_1^2}$

Substituting values

$\frac{T_2}{T_1} = \frac{(228.99)^2}{(230)^2}$

$T_2 = 0.99$ % lower than $T_1$

5 0

4 years ago

I need help understanding this concept . Would appreciate it so much. Thank you

Firlakuza [10]

Answer:

Explanation:

Both these questions are based on the Universal Law of Gravitation, which is given by :

F = Gm1m2 / r²

2) F = 6.67 x 10⁻¹¹ x 8 x 10³ x 1.5 x 10³ / 1.5 x 1.5

F = 6.67 x 10⁻⁵ x 8 / 1.5

F = 35.57 x 10⁻⁵ N

3) F = 6.67 x 10⁻¹¹ x 7.5 x 10⁵ x 9.2 x 10⁷ / 7.29 x 10⁴

F = 6.67 x 10⁻³ x 7.5 x 9.2 / 7.29

F = 63.13 x 10⁻³ N

7 0

3 years ago

You are playing ice hockey with friends on a frozen pond. The hockey puck (mass 0.2 kg) is sliding on the ice at 10 m/s when it

chubhunter [2.5K]

Answer:

The mass of the hailstone is $m_2 = 0.05$

Explanation:

From the question we are told that

The mass of the hockey puck is $m_1 = 0.2 \ kg$

The initial speed of the puck is $u_1 = 10 \ m/s$

The final speed of the puck is $v_f = 8 \ m/s$

According to the principles of linear momentum

$m_1u_1 + m_2u_2 = (m_1 + m_2)v_f$

At initial the velocity of the hailstone was zero so

$u_2 = 0 \ m/s$

So

$m_1 u_1 = (m_1 + m_2 )v_f$

substituting values

$0.2 * 10 = (0.2 + m_2 )* 8$

=> $2 = (0.2 + m_2 )* 8$

=> $0.25 = 0.2 + m_2$

=> $m_2 = 0.05$

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3 years ago

Newton’s first law of motion is often called the law of?

jeka57 [31]

Answer:

Newton's first law is often called the law of inertia.

searched it up to verify

Also welcome to brainly

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3 years ago