1.an ink dot on white procelain dish appears dark. When dish is raisied to very large temerature the dot appears brighter than surrounding . why? 2. why do heels crack in winter? what effect does application of lubricants have on heels? 3.the earth is recieving heat from sun continiously. in this case, the earth will be as hot as a furnace in no time. As such thing does not happen, what compensatory measure does earth have to maintain temperature?

Q: Why is the foam of root beer white, while the beverage is dark brown?

A: In the case of foam, it is composed of tiny bubbles of very thin layers; therefore; the scattering…

Q: Why do wet objects normally look darker than the same objects when dry?

A: When light is incident on the wet objects, it undergoes internal reflection multiple times in the…

Q: When a glass of cold water is left on the table at room temperature, water droplets are seen on the…

A: To determine the reason of a glass of cold water left on the table at room temperature, water…

Q: Why are there things that are reflective and non-reflective

A: This is not a simple question to answer. There are many factor which includes, why they will reflect…

Q: Building contractors often install double-glazed windows to prevent thermal energy (heat) from…

A:

Q: ASK YOUR TEACHER vacuum is incident on a shard of Shawtonium (a newly discovered compound). The…

A: Refractive index=1.6

Q: At the beach, you can get a sunburn while under the shade of an umbrella. Explain the statement?

A: Sun burn is a radiation that affects the tissues upon over exposure to UV rays.

Q: 11. What is the contrast of a red text (reflectance = 12%) on a yellow paper (reflectance = 80%)? a.…

A: given: R(red) =12% = 0.12R(yellow) = 80% = 0.80

Q: 4. The sky is mostly blue with some

A: The type of weather is FAIR WEATHER

Q: Scattering Loss. At A, = 820 nm the absorption loss of a fiber is 0.25 dB/km and the scattering loss…

A: Given: The absorption loss is l=2 dB/km. The scattering loss at 820 nm is L=2.25 dB/km. The…

Q: A slab of glass 0.2mthick absorbs 50% of the light passing through it. How thick must a slab of…

A: Given data: Thickness of the material, x=0.5 m

Q: A spherical object of radius 10.5 cm is heated to a certain temperature. After examing its emission…

A:

Q: Building contractors often install double-glazed windows to prevent thermal energy (heat) from…

A:

Q: An opaque cylindrical tank with an open top has a diameter of 3 m and is completely filled with…

A: Given that,The diameter of a cylindrical tank (d) = 3 mHere we need to find the depth of the tank:As…

Q: At the beach, you can get a sunburn while under the shade of an umbrella. What is your explanation?

A: The reason of Sunburn is ultraviolet rays.

Q: Building contractors often install double-glazed windows to prevent thermal energy (heat) from…

A:

Q: Look at your red , sunburned feet when they are under water. Why don’t they look as red as they are…

A: Ray of light coming from red wound will undergo scattering and refraction both at water surface.

Q: A pressure sensor inside of a mixing tank is designed to turn red when the pressure inside the tank…

A:

Q: What is the Brewester's angle for air to glass transition? (ug = 1.5)

A: when the light goes from one medium to another medium then if elected and refracted light is…

Q: uilding contractors often install double-glazed windows to revent thermal energy (heat) from…

A: Lateral shift is distance between path of incident ray and path of refracted ray. Lateral shift…

Q: Why does water make a shirt darker?

A: Transparency: When an object is placed in the sight of an eye and a person is still be able to see…

Q: 4.2 PQ4 You are pouring a heavy syrup on your pancakes. As the syrup spreads over the pancake, would…

A: Viscosity concept is use here.

Q: The atmosphere of Jupiter is more than 1000km thick .from the surface of Jupiter would you expect to…

A: Step 1Jupiter doesn’t have a surface; it consists of thick gas or a semi-liquid form due to the…

Q: The skin reflects most visible and IR-A (near-infrared) radiation

A: The statement is-

Q: Explain why :(a) a body with large reflectivity is a poor emitter(b) a brass tumbler feels much…

A: A).A body with high reflectivity will have bright surface so that they will be poor absorber of…

Q: The hot-water needs of a household are to be met by heating water at 55°F to 180°F by a parabolic…

A: The specific heat of water cp=1Btu/lbm.oF. Here, The total amount of heat transfer is

Q: Opaque objects cannot be viewed through a compound light microscope, why?

A: The objects across which light cannot pass through are known as opaque objects. Whereas the objects…

Q: An opaque cylindrical tank with an open top has a diameter of 3.25 m and is

A:

Q: The hot water needs of a household are to be met by heating water at 55°F to 200°F by a parabolic…

A: The properties of water at the average temperature of (55+200)/2 = 127.5°F are (Table A-9E)

Q: Building contractors often install double-glazed windows to prevent thermal energy (heat) from…

A: Given ng = 1.5 yg  = 52 mm ya = 41.6 mm Light incident angle ϕ  = 40 0 na  = 1.00 To find shift in…

Q: Brewster's angle (n=1.5) from air to glass? temperatures of 78.4°F b. A temperature of 48.7…

A: The course of polarization (the manner in which the electric field vectors point) is corresponding…

Q: A possible means for making an airplane invisible to radar is to coat the plane with an…

A: Wavelength ( λ ) = 3.30 cm Refractive index ( n ) = 1.40  Let h is the thickness required

Q: To reduce glare from the surroundings, the windows of some department stores, rather than being…

A: To reduce the glare from the surroundings, the windows of some departmental stores, rather than…

Q: If you were to subject a green ink to paper chromatographic separation, what are the possible colors…

A:

Q: A ray of light is incident on a piane mirror and the angie of refiection is 59 degrees. What is the…

A:

Q: which warms more quickly in sunlight -a colourless or coloured piece of glass? Also explain Why?

A: A coloured glass can absorb all the colours except its own colour while the colourless glass can’t…

Q: The air in a dark, smoky room often looks bluish when illuminated by white light. What creates this…

A: Given statement : "The air in a dark, smoky room often looks bluish when illuminated by white light"…

Q: Why does the blood of injured deep-sea divers look greenish-black in underwater photographs taken…

A: Natural light at low depths of the ocean is blue due to the filtering effect of a water above. There…

Q: Why are infrared rays often called heat waves?

A: When infrared rays fall on object, they cause entire atoms and molecules to vibrate. And due to…

Q: THE MOST HIGH INDICATORS OF THE COEFFICIENT OF NATURAL LIGHTING IN THE RESIDENTIAL PREMISES

A: ANS: 3. Same for the whole room

Q: Part A  the moderate temperatures of the islands throughout the world has mainly to do with water's…

A: Part A:The moderate temperature range of islands plays main role in determining the high specific…

Dispersion of White Light

Snell’s law is a formula that gives a relation between the angle of incidence and angle of refraction and is given as: