Physics Ray Optics Level: Misc Level
If 1 kg of radium (half-life= 1600 years) is sealed into a container, how much of it willremain as radium after 1600 years? After 4800 years? If the container is opened after a period of time , what would you expect to find inside it?
Physics Ray Optics Level: Misc Level
If 1 kg of radium (half-life= 1600 years) is sealed into a container, how much of it willremain as radium after 1600 years? After 4800 years? If the container is opened after a period of time , what would you expect to find inside it?
Physics Ray Optics Level: Misc Level
Whic is solid at room temperature? Na2SO4, NO2, CCI4,H2S.
Physics Ray Optics Level: Misc Level
Why are polaroid glasses which are good for blocking out glare, not recommended for viewing the sun during a solar eclipse?
Physics Ray Optics Level: Misc Level
Gayle runs at a speed of 4 m/s and dives on a sled, initially at rest on the top of a frictionless snow-covered hill. After she has descended a vertical distance of 5 m, her brother, who is initially at rest, hopson her back and together they continue down the hill. what is their speed at the bottom of the hill if the vertical drop is 15 m?Gayle,s mass is 50 kg, the sled has a mass of 5 kg, and her brother has a mass of of 30 kg.
Physics Ray Optics Level: Misc Level
Calculate the index of refraction for a good antireflection coating for Sidetector (n=3.4)placed in air that will minimize the reflection from the deterctor surface.
Physics Ray Optics Level: Misc Level
Three vectors A ,B, and C are such that A+B=C and I A I 2+ I B I2 =IC I 2. Which of the follwing statements is correct?
Physics Ray Optics Level: Misc Level
A steel cable spanning a river is 195.946 m long when the temperature is 20 degree C.What will be its length when the temperature drops to 0 degree C? ( The coefficient of thermal
12 x10-6 1-C).
expansion of steel is
(a) 195.997 m
(b) 195.903 m
Physics Ray Optics Level: Misc Level
We have seen that two monochromatic light waves can interfere constructively or destructively, depending on their phase difference. One consequence of this phenomena is
the way in which polaroid sunglasses work.
a rainbow.
the colors you see when white light is reflected from a soap bubble.
the appearance of a mirage in the desert.
the formation of an image by a converging lens, such as the lens in your eye.
Physics Ray Optics Level: Misc Level
A convex lens is placed on a flat glass plate and illuminated from above with monochromatic red light. When viewed from above, concentric bands of red and dark are observed. What does one observe at the exact center of the lens where the lens and the glass plate are in direct contact?
A rainbow of color
A dark spot
A bright red spot
A bright spot that is some color other than red
Physics Ray Optics Level: Misc Level
Two lenses are combined to from a compound lens. One of the lenses has a power of 12.8 D and the other has a power of -5.94 D,Find the focal length of the resulting lens. Answer in units of cm.
Physics Ray Optics Level: Misc Level
A concave mirror has a focal length of 12 cm. What is the position of the resulting image if the image is inverted and 3 times smaller than the object? Answer in units of cm?
Physics Ray Optics Level: Misc Level
A light ray passes downward into a block of transparent plastic with an angle of incidence of 0 = 52. 8 degrees. If total internal reflection is to occur when the light strikes the left edge of the block at interface b, what is the index of refraction of the plastic?
Physics Ray Optics Level: Misc Level
What is the minimum ( non-zero) thickness for the air layer between two flat glass surfaces if the glass is to appear dark when 6.8 E 2- nm light is incident normally?
b. What if the glass is to appear bright?
Physics Ray Optics Level: Misc Level
How far apart are an object and an image formed by a 75- cm focal -length converging lens if the image is 2.0 X larger than the object and is real?
