Sóng ánh sáng Practice Questions
THPT (Vietnam) · THPT Vật lý · 133 free MCQs with instant results and detailed explanations.
133
Total
44
Easy
72
Medium
17
Hard
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Sample Questions from Sóng ánh sáng
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Q1
Easy
What is the speed of light in a vacuum?
A.
3 x 10^8 m/s
B.
3 x 10^6 m/s
C.
3 x 10^10 m/s
D.
3 x 10^9 m/s
Show Answer & Explanation
Correct Answer: A
The speed of light in a vacuum is a fundamental constant, approximately equal to 3 x 10^8 meters per second, which is widely used in physics.
Q2
Easy
If the wavelength of a light wave is 500 nm, what is its frequency? (Assuming the speed of light is 3 x 10^8 m/s)
A.
6 x 10^14 Hz
B.
3 x 10^14 Hz
C.
1.5 x 10^15 Hz
D.
1 x 10^14 Hz
Show Answer & Explanation
Correct Answer: A
Frequency can be calculated using the formula: frequency = speed of light / wavelength. Thus, frequency = 3 x 10^8 m/s / 500 x 10^-9 m = 6 x 10^14 Hz.
Q3
Easy
Which of the following properties of light explains why it can travel through a vacuum?
A.
Light has mass.
B.
Light does not require a medium.
C.
Light travels slower in a vacuum.
D.
Light bends when passing through air.
Show Answer & Explanation
Correct Answer: B
Light does not require a medium to propagate; it can travel through a vacuum, which is why it can reach us from the Sun despite the empty space in between.
Q4
Medium
What is the speed of light in a vacuum?
A.
3.0 x 10^8 m/s
B.
1.5 x 10^8 m/s
C.
3.0 x 10^10 m/s
D.
1.0 x 10^8 m/s
Show Answer & Explanation
Correct Answer: A
The speed of light in a vacuum is approximately 3.0 x 10^8 m/s, which is a fundamental constant in physics.
Q5
Medium
When light passes from air into water, what happens to its speed?
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes twice as fast
Show Answer & Explanation
Correct Answer: B
Light travels slower in water than in air due to the higher refractive index of water, which causes a decrease in speed.
Q6
Medium
If a beam of light enters an optical fiber at an angle of incidence greater than the critical angle, what will happen?
A.
The light will be refracted out of the fiber
B.
The light will be totally internally reflected
C.
The light will pass through unaffected
D.
The fiber will break
Show Answer & Explanation
Correct Answer: B
When light enters an optical fiber at an angle greater than the critical angle, it undergoes total internal reflection, allowing it to travel along the fiber.
Q7
Medium
When light passes from a medium with a higher refractive index to one with a lower refractive index, what phenomenon occurs?
A.
Diffraction
B.
Reflection
C.
Refraction
D.
Dispersion
Show Answer & Explanation
Correct Answer: C
When light transitions from a medium with a higher refractive index to one with a lower refractive index, refraction occurs, bending the light away from the normal.
Q8
Hard
A light wave has a wavelength of 500 nm in a vacuum. When it travels through glass with a refractive index of 1.5, what is its wavelength in glass?
A.
333 nm
B.
500 nm
C.
750 nm
D.
250 nm
Show Answer & Explanation
Correct Answer: A
The wavelength of light in a medium is given by λ' = λ/n, where λ is the wavelength in a vacuum and n is the refractive index. Therefore, λ' = 500 nm / 1.5 = 333 nm.
Q9
Hard
A beam of light passes from air into a glass medium with a refractive index of 1.5. If the angle of incidence in air is 30 degrees, what is the angle of refraction in the glass?
A.
19.1 degrees
B.
20.0 degrees
C.
18.5 degrees
D.
22.5 degrees
Show Answer & Explanation
Correct Answer: A
Using Snell's Law (n1*sin(θ1) = n2*sin(θ2)), where n1 is the refractive index of air (1), n2 is that of glass (1.5), and θ1 is 30 degrees, we find θ2 to be approximately 19.1 degrees. This confirms option A is correct.
Q10
Hard
A monochromatic light source emits light at a wavelength of 500 nm. If the light passes through a prism with a refractive index of 1.5, what is the speed of light in the prism?
A.
2.00 x 10^8 m/s
B.
1.00 x 10^8 m/s
C.
3.00 x 10^8 m/s
D.
2.25 x 10^8 m/s
Show Answer & Explanation
Correct Answer: A
The speed of light in a medium is calculated using the formula v = c/n, where c is the speed of light in vacuum (3.00 x 10^8 m/s) and n is the refractive index. Therefore, v = 3.00 x 10^8 m/s ÷ 1.5 = 2.00 x 10^8 m/s.
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Sóng ánh sáng — THPT (Vietnam) THPT Vật lý Practice Questions Online
This page contains 133 practice MCQs for the chapter Sóng ánh sáng in THPT (Vietnam) THPT Vật lý. The questions are organized by difficulty — 44 easy, 72 medium, 17 hard — so you can choose the right level for your preparation.
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