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Elden [556K]
3 years ago
11

Which of following statement is incorrect? A. Light absorption rate of a solid material is wavelength dependent. B. Light can pe

netrate metal if its frequency is lower than the plasma frequency. C. At a resonance frequency of an isotropic material, the transmitted light is substantially reduced. D. There is no double refraction when light beam travels along the optical axis of a uniaxial crystal
Physics
1 answer:
Minchanka [31]3 years ago
6 0

Answer:

C and D

Explanation:

An Optic axis of crystal is a direction in which a ray of transmitted light suffers no birefringence (double refraction). A uni axial crystal (example- calcite, quartz) is isotropic within the plane orthogonal to the optic axis of the crystal.

Hence, option A and B are incorrect and option C and D are options are correct.  

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Describe the conversions between potential and kinetic energy that occur when you shoot a basketball at a basket
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When you shoot a basketball at a basket, the energy from your hands is transferred into the basketball. When you hold the ball up in preparation to shoot, it has potential energy, meaning that it has stored energy that can turn into kinetic energy. When you shoot it, that potential energy turns into kinetic energy, causing the basketball to move.
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3 years ago
A horizontal line on a velocity/time graph shows ____ acceleration.
Novay_Z [31]

Answer:

Zero (0)

Explanation:

A horizontal line will be no movement of negative of positive acceleration

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3 years ago
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An atom of uranium 238 emits an alpha particle (an atom of He) and recoils with a velocity of 1.895 * 10^ 5 m/sec . With velocit
lora16 [44]

<u>Answer:</u> The velocity of released alpha particle is 1.127\times 10^7m/s

<u>Explanation:</u>

According to law of conservation of momentum, momentum can neither be created nor be destroyed until and unless, an external force is applied.

For a system:

m_1v_1=m_2v_2

where,

m_1\text{ and }v_1 = Initial mass and velocity

m_2\text{ and }v_2 = Final mass and velocity

We are given:

m_1=238u\\v_1=1.895\times 10^{5}m/s\\m_2=4u\text{ (Mass of }\alpha \text{ -particle)}\\v_2=?m/s

Putting values in above equation, we get:

238\times 1.895\times 10^5=4\times v_2\\\\v_2=\frac{238\times 1.895\times 10^5}{4}=1.127\times 10^7m/s

Hence, the velocity of released alpha particle is 1.127\times 10^7m/s

4 0
3 years ago
What two forces limit the height to which capillary action will take water up a tube?
Jobisdone [24]
Capillary action<span> occurs when the adhesion to the walls is stronger than the cohesive</span>forces<span> between the liquid molecules. The </span>height to which capillary action will take water<span> in a uniform circular </span>tube<span> (picture to left) is limited by surface tension and, of course, gravity.

Hope this helps. :)</span>
3 0
3 years ago
When you go out into the sun, the UV light can give you a tan. UV light has a frequency of 7.89 x 1014 Hz. What is the wavelengt
Olin [163]

Answer:

Explanation:

Formula and givens

  • λ = c / f
  • λ is the wavelength
  • c = the speed of light
  • f = the frequency
  • c = 3*10^8
  • f = 7.89 * 10^14

λ = ?

Solution

λ = 3*10^8 / 7.89*10^14

λ = 3*10^8/7.89*10^14

λ = 2.36 * 10^7

λ = 236 nanometers. What you use as your solution depends on what what you have been taught.

6 0
3 years ago
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