Q: Which equation gives the critical angle $$\theta_c$$ for total internal reflection between two media with refractive indices $$n_1$$ \u003e $$n_2$$?

$$ \sin \theta_c = \frac{n_2$}{n_1$} $$

Question 1

A metal rod is heated at one end. Which of the following best describes the primary mechanism of heat transfer along the rod?

Accepted Answer

Conduction

Question 2

A glass window separates a warm room from the cold outdoors. Which process is primarily responsible for the loss of heat from the room through the glass?

Accepted Answer

Conduction

Question 3

Which equation correctly expresses the rate of heat transfer by conduction through a slab of material?

Accepted Answer

$$ Q = \frac{kA(T_1$ - T_2$)t}{d} $$

Question 4

A black surface and a shiny silver surface are exposed to the same radiant energy. Which statement is correct regarding their absorption and emission of heat?

Accepted Answer

The black surface absorbs and emits more heat than the silver surface.

Question 5

A wave travels from air into water. Which property of the wave remains unchanged?

Accepted Answer

Frequency

Question 6

Which of the following best describes the relationship between the speed $$v$$, frequency $$f$$, and wavelength $$\lambda of a $$wave?

Accepted Answer

$$ v = f\lambda $$

Question 7

Which of the following electromagnetic waves has the shortest wavelength?

Accepted Answer

Gamma rays

Question 8

A microwave oven operates at a frequency of $$2.45 	imes 10^9$ Hz. What is the wavelength of the microwaves in air? (Speed of light c = 3.00$$ 	imes $$10^8 m/s)$$

Accepted Answer

$$ 1.22 	imes 10$$^{-1}$$  m$$

Question 9

Which law describes the angle of incidence and angle of reflection for a light ray striking a mirror?

Accepted Answer

Law of Reflection

Question 10

A light ray passes from air ($$n=1.00) $$into glass ($$n=1.50) at an $$angle of $$30^\circ to $$the normal. What is the angle of refraction in the glass?

Accepted Answer

$$ 19.5^\circ $$

Question 11

Which of the following best describes total internal reflection?

Accepted Answer

Light is completely reflected back into the medium when the angle of incidence exceeds the critical angle.

Question 12

Which equation gives the critical angle $$	heta_c$$ for total internal reflection between two media with refractive indices $$n_1$$ \u003e $$n_2$$?

Accepted Answer

$$ \sin 	heta_c = \frac{n_2$}{n_1$} $$

Question 13

A person stands 2 meters in front of a plane mirror. How far is the image from the person?

Accepted Answer

4 meters

Question 14

Which of the following statements about electromagnetic waves is correct?

Accepted Answer

They are transverse waves consisting of oscillating electric and magnetic fields.

Question 15

A sound wave travels from air into water. What happens to its speed and wavelength?

Accepted Answer

Both speed and wavelength increase.

Question 16

Which of the following best describes the Doppler effect?

Accepted Answer

A change in the frequency or wavelength of a wave due to the relative motion of source and observer.

Question 17

A heat engine absorbs 500 J of heat and does 200 J of work. How much heat is expelled to the cold reservoir?

Accepted Answer

300 J

Question 18

Which of the following is a correct statement of the second law of thermodynamics?

Accepted Answer

The entropy of an isolated system never decreases.

Question 19

Which of the following is NOT a property of waves?

Accepted Answer

Evaporation

Question 20

A ray of light passes from water ($$n=1.33) $$into air ($$n=1.00) at an $$angle greater than the critical angle. What phenomenon occurs?

Accepted Answer

Total internal reflection

Physics Study Guide: Units 8-10 (Heat Transfer, Properties of Waves, Electromagnetic Waves)

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