It is hotter at the same distance over the top of a fire than in front of it, Why?

Q: Consider an opaque body capable of absorbing red light and illuminated by: Yellow light

A: given: body absorbs = red light (R) illuminated by   = yellow light  (Y)

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: Which warms more quickly in sunlight- a colorless or a colored piece of glass? Why?

A: A colored glass can absorb all the colors except its own color while the colorless glass can't…

Q: What is the effect of temperature on angle of contact?

A: If the temperature increases, angle of contact decreases due to decrease cohesive force and if the…

Q: Discuss the scientific properties of why the sky is blue.

A: The blue color of sky:

Q: Choose the BEST answer to the following: Compared with radiation from the Sun, terrestrial radiation…

A: Step 1The electromagnetic radiation emitted by the Earth’s surface and atmosphere is called…

Q: A tennis ball bounces on the floor three times. If each time it loses 22.0% of its energy due to…

A: Given Loss in energy after each bounce = 22% Initial height = 2.3 m Required Final height

Q: Why do opaque materials become warmer when light shines on them?

A: The incident light energy on the material of the opaque substances vibrates the atoms r molecules of…

Q: Why does the color of a surface affect emissivity?

A: Emissivity of the surface of a colored body is the body's effectiveness to radiate thermal energy.…

Q: For a blackbody object of given volume, which shape will it emit the least radiation? Why?

A:

Q: In a boutique store with only fluorescent lighting, a customer insists on taking dresses into the…

A: The fluorescent light highlights high frequencies, and do not possess all range of colors to be…

Q: Why does a good emitter of heat radiation appear black at room temperature?

A: A good emitter of heat radiation appears black at room temperature because good emitters are having…

Q: If you place a candle directly in front of a large speaker that is playing music, what do your…

A: Sound waves travel due to disturbance in the medium and the particles oscillate around their mean…

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: at colors do the two wavelengths corres

A:

Q: What is the effect on the color of a cloud when it contains an abundance of large droplets?

A: The sunlight scattering the droplets in absorb most of the light.

Q: When fighting fires, a firefighter must use great caution to hold a hose that emits large amounts of…

A: The hose is pumping a lot of water with large mass at a high speed. This means that water has a…

Q: Why do clouds seem floating in the sky?

A:

Q: Why is white wash sometimes applied to the glass of florists greenhouses in the summer?

A: A greenhouse traps heat inside it. Sunlight entering through the glass gets reflected inside the…

Q: To keep chickens warm in a chicken coop, why would a CFL be a poor choice compared with an…

A:

Q: L 40 cm

A:

Q: Is there any connection between object's feeling hot or cold and its thermal conductivity?

A: Thermal conductivity is the amount of heat transferred per unit time through unit area with a…

Q: A distant star has a peak wave length of 0.00000062. What is the temperature of that star?

A: T=2.898×10-3 m·Kλmax Let the wavelength be in meter.

Q: When you look at a shirt and it is blue…. WHY IS IT BLUE? What is being absorbed and what is being…

A: What colour our eye see is the reflected colour which an object reflects. Rest of the colours are…

Q: A soldier sees the flash from a cannon that is fired in the distance and 10 seconds later he hears…

A: The velocity of an object is define das the ratio  of the displacement of the object to the time…

Q: What do you notice when you get into a car that has been sitting in the Sun for a while?

A: the inside of the car will warm because radiation is coming in but not much is going back out.

Q: How would the whiteness of snow appear if Earth's atmosphere were several times denser?

A: According to the Rayleigh scattering, the dispersion is greater at lower wavelengths (higher…

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: Water at the base of a waterfall is slightly warmer than at the top. Why?

A:

Q: Explain why we see distant mountains as blue green in color instead of seeing it as green?

A: The sky is blue because the air in the atmosphere scatters blue light.

Q: A body with large reflectivity is a poor emitter, Why?

A: According to Kirchhoff's law, a poor absorber of heat is a poor emitter. Hence, a body with large…

Q: Radian is used to measure   A) Temperature B) Intensity of Flame C) Angle D) Solid Angle

A: Radian is the unit of  plane angle, which is given by following formula: Angle=Arcradius   Whereas,…

Q: Red sun rise occurs for the same reason as red sunsets. But sunsets are usually more colourful than…

A: The light from the sun travels through Earth’s atmosphere it undergoes scattering before it reaches…

Q: When an object is painted red, what color is absorbed most?

A: When an object is painted red, it looks red because the molecules in the paint have absorbed the…

Q: An explorer is standing in a cave. It emits a sound which echoes back to it 20 s later. If it is 5 °…

A:

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: If the sunlight were somehow green in color instead of white, what color clothing would be advisable…

A: Since green color will absorb all color frequencies except green so when sunlight of green color…

Q: Comment on the statement “Oh, that beautiful red sunset is just the leftover colors that weren’t…

A: When light falls on suspended particles that are present in the air then it gets scattered. White…

Q: Colors that absorb radiation most effectively are the least effective emitters. O True O False

A: Electromagnetic radiation is emitted and absorbed by all bodies, whether they are black, white, or…

Q: what is the direct relationship between temperature and speed of sound?

A: There is a simple relationship between temperature and the speed of sound. The speed of sound…

Speed of light

The speed at which the light travels in a vacuum is unbiased for both the source and inertial frame of reference of the observer. This was postulated by the physicist, Albert Einstein, by observing the theory of electromagnetism of Maxwell. Also, there was no evidence for the luminiferous aether, that is, the medium for the propagation of light where the electromagnetic field exists.