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3 years ago

If a substance cannot be broken down chemically into a simpler substance, it is ____?

Physics

2 answers:

lara31 [8.8K]3 years ago

8 0

The answer is D. An element

Semmy [17]3 years ago

4 0

The answer is D. An element. An element cannot be broken down chemically. Hope this helped!

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An electron in a hydrogen atom undergoes a transition from the n = 3 level to the n = 6 level. To accomplish this, energy, in th

Harlamova29_29 [7]

Answer: $1.816\times 10^{-19} J$

Explanation:

Given

$E=\frac{hc}{\lambda }$

$E=2.18\times 10^{-18}(\frac{1}{n_1^2}-\frac{1}{n_2^2})$

where h=Planck constant

c=speed of light

$E=2.18\times 10^{-18}(\frac{1}{3^2}-\frac{1}{6^2})$

$E=2.18\times 10^{-18}\times \frac{1}{12}$

$E=1.816\times 10^{-19} J$

7 0

3 years ago

Unpolarized light with intensity 300 W/m^2 passes first through a polarizing filter with its axis vertical, then through a secon

SOVA2 [1]

Answer:

The angle from vertical of the axis of the second polarizing filter is 50.57⁰.

Explanation:

Given;

intensity of the unpolarized light, I₀ = 300 W/m²

intensity of emergent polarized light, I = 121 W/m²

let the angle from vertical of the axis of the second polarizing filter = θ

Apply Malus's law, intensity of emergent polarized light is given as;

I = I₀Cos²θ

$Cos^2 \theta = \frac{I}{I_o} \\\\Cos^2 \theta =\frac{121}{300} \\\\Cos^2 \theta =0.4033\\\\Cos \theta = \sqrt{0.4033} \\\\Cos \theta = 0.6351\\\\\theta = Cos^{-1} (0.6351)\\\\\theta = 50.57 ^0$

Therefore, the angle from vertical of the axis of the second polarizing filter is 50.57⁰.

8 0

3 years ago

Why are choir concerts better in performance halls than in gymnasiums?

dlinn [17]

Constructive interference in performance halls and the elimination of echoes are reasons why choir concerts better in performance halls than in gymnasiums.

<h3>What is constructive interference?</h3>

Constructive interference is a phenomenon which occurs when two waves travelling in same direction and which are in phase add up together to produce a wave of greater amplitude.

Constructive interference occurs in performance halls while destructive interference occurs in gymnasiums.

Also in performance halls, echoes are minimized due to the padded walls and the curtains while echoes which disturb choir concerts occur in gymnasiums.

Therefore, choir concerts better in performance halls than in gymnasiums because of constructive interference in performance halls and the elimination of echoes.

Learn more about constructive interference and echoes at: https://brainly.in/question/2378717

3 0

2 years ago

Joey drags his 25kg brother across the floor with a force of 12 N to the right at a constant velocity. Determine the normal forc

bekas [8.4K]

Since the velocity is constant, using Newton's First and Third Laws we know that the Friction and the Force are equal. So the friction is -12 Newtons.

Now the Normal Force (N) is also equal to the weight since the body is at a perfect balance.

So Weight is m*g = 25*10 = 250N

So N=250N

4 0

4 years ago

You are cooking spaghetti and you look into the pot of boiling water before you put the spaghetti in. You notice the water movin

zhenek [66]

Answer:

Heat transfer is an exchange of thermal energy between two objects. The rate of heat transfer depends upon the temperatures of each entity and the medium through which the thermal energy is being transferred. In cooking, heat transfer refers to heating your food items through a cooking appliance, such as a stove, fryer, microwave, or oven.

Explanation:

I hope it helps

3 0

3 years ago

Read 2 more answers