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3 years ago

According to Chapter 18, explain why a purple flower appears purple when white light shines on it.

Physics

2 answers:

arlik [135]3 years ago

7 0

Explanation:

An object can only be seen when light falls on it, reflects and enters into observer's eye. We know that the white light is made up of seven colors represented as an acronym: VIBGYOR. This means when light falls on an object all the seven colors are falling on it. But every object has it own properties and it reflects some color and absorbs some colors. The color/colors which are reflected from the object will become the color of that object.

Not here the flower appear purple which means only purple light is being reflected from the flower. But if you notice there is no purple in the white light!

This happens because red and blue light is reflected off the flower which mixes and show the purple color.

ahrayia [7]3 years ago

4 0

The flower absorbs purple light

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katrin2010 [14]

A uniform disk is constrained to rotate about an axis passing through its center and perpendicular to the plane of the disk. If the disk starts from rest and is then brought in contact with a spinning rubber wheel, we observe that the disk gradually begins to rotate too. If after 35 s of contact with this spinning rubber wheel, the disk has an angular velocity of 4.0 rad/s, find the average angular acceleration that the disk experiences. (Assume the positive direction is in the initial direction of rotation of the disk. Indicate the direction with the sign of your answer.)

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Answer:

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Explanation:

The expression for the angular acceleration of a disk that is in contact with a spinning wheel can be given as:

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$\alpha = \frac{ \omega_f-\omega_i}{\delta t}$

$\alpha = \frac{ 4.0 rad/s-0 rad/s}{35}$

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substituting 11.0 rad/s for $\omega$ and t = 35 s ; we have:

$\theta = 11.0 rad/s * 35 s$

$\theta = 385 rad$

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plz..

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