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This is an MCQ-based Physics quiz for GRE, which includes questions on Electromagnetics, Waves, and Optics.
A particle traveling through glass (index of refraction 1.33) emits Cherenkov radiation. Which of the following is a possible speed of the particle?
5c/8
c/8
7c/8
3c/8
9c/8
A monochromatic beam of 600nm light travels through a material with a phase velocity of 2*10^8 m/s. What is the refractive index of the material?
2.4
1.33
0.67
1.7
1.5
A double slit experiment is set up with the following parameters: two slits are a separated by a distance d. A beam of light with wavelength λ shines through the two slits, and is projected onto a screen a distance L from the slits. What is the distance on the screen between the central band and the next band on either side?
x=2Lλ / d
x=L^2λ / 2d^2
x=2L^2λ / d^2
x=L^2λ / d^2
x= Lλ / d
Two waves with frequencies: f1=6MHz, f2=2MHz are combined. What is the frequency of the resulting beat?
12 MHz
4 MHz
8 MHz
3 MHz
7 MHz
A beam of light, with wavelength 400nm, is normally incident on a transmission diffraction grating. With respect to the incident beam, the first order diffraction maximum occurs at an angle of 6 degree. What is the number of slits per centimeter on the grating?
4*10^4 lines/cm
2.5*10^3 lines/cm
4*10^6 lines/cm
4*10^5 lines/cm
2.5*10^5 lines/cm
A car"s horn has a frequency of 439 Hz. As the car drives away from you, you hear the horn at a frequency of 384 Hz. What is the speed of the car? (velocity of sound = 343 m/s)
43.87 m/s
40 m/s
52 m/s
37.45 m/s
49.13 m/s
A beam of unpolarized light passes through two linear polarizers whose polarization axes are at an angle theta with each other. The light initially has an intensity I, and has an intensity of 3/8*I after passing through both polarizes. Find angle?
180 degree
90 degree
45 degree
30 degree
60 degree
A beam of light travels through a medium with index of refraction n1=2.4 until it reaches an interface with another material, with index of refraction n2=1.2. No light is transmitted into the second material. At what angle (measured from the plane of the interface between the two materials) does the beam hit the second material?
90 degree
45 degree
30 degree
60 degree
This situation is impossible.
The focal length of a thin convex lens is 10 cm. A candle is placed 25 cm to the left of the lens. Approximately where is the image of the candle?
7 cm to the left of the lens
17 cm to the left of the lens
17 cm to the right of the lens
No image is created
7 cm to the right of the lens
A candle 5 cm tall is placed 25 cm to the left of a thin convex lens with focal length 10 cm . What is the height and orientation of the image created?
No image is created.
85/17 cm, upright
85/17 cm, inverted
17/85 cm, inverted
17/85 cm, upright
