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Physics Chapter 4 Quiz

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Questions and Answers

What is the threshold frequency in relation to photoemission?

The frequency at which no photoemission occurs.

The minimum frequency of incident radiation that can cause photoemission. (correct)

The highest frequency of incident radiation that can cause photoemission.

The average frequency of all emitted photons.

When calculating the refractive index using $d𝜇𝑟 = tan 30°$, what does $d𝜇𝑟$ represent?

The refractive index of a rarer medium with respect to a denser medium. (correct)

The angle of incidence.

The intensity of incident radiation.

The speed of light in a vacuum.

How does the intensity of radiation relate to the number of photons?

Intensity is inversely proportional to the number of photons.

Intensity is equal to the energy of a single photon.

Intensity has no relation with the number of photons.

Intensity is proportional to the number of energy quanta per unit area per unit time. (correct)

What happens to waves with a frequency beyond 30 MHz?

They penetrate through the ionosphere. Signup and view all the answers

What is the significance of showing arrows when marking charge distributions in a diagram?

They provide visual representation of the charge direction. Signup and view all the answers

If the charges on the plates in a diagram are not shown, what is the consequence?

No marks will be deducted for missing charges. Signup and view all the answers

What mathematical operation is involved in finding the refractive index using $tan θ$?

Division Signup and view all the answers

What does the term 'photoemission' refer to?

Emission of electrons from a surface due to incident radiation. Signup and view all the answers

Study Notes

Question 1

The diagram for the electric field lines of two point charges is missing, so it is impossible to summarize the specific answer.

Question 2

The answer is "No Change". It is unclear what concept or scenario this refers to.

Question 3

Photoelectric emission: The minimum frequency of light needed to eject electrons from a material is called the threshold frequency.
Intensity of radiation: It is directly proportional to the number of photons per unit area per unit time.

Question 4

The refractive index of a rarer medium with respect to a denser medium is calculated by the formula: 𝜇𝑟 = tan (30°), where 𝜇𝑟 is the refractive index of the rarer medium relative to the denser medium.
The formula to calculate the velocity of light in a medium is: v = c/µ, where c is the speed of light in a vacuum and µ is the refractive index of the medium.

Question 5

Electromagnetic waves with frequencies above 30 MHz can penetrate the ionosphere layer of the Earth's atmosphere and are not reflected back.

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Description

This quiz covers key concepts in physics, including electric fields, photoelectric emission, refractive index, and electromagnetic waves. Test your understanding of these fundamental topics and their associated formulas. Perfect for students studying optical physics and electromagnetism.