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

Q: What is vulnerabilty of security guards during heat waves? What  problems they might face during…

A: Heat is just energy in transit. When it is not moving it is thermal energy. It is that heat flows…

Q: What is vulnerabilty of security guards during heat waves? What problem they might face during heat…

A: Heat is just energy in transit. Flow of energy thermal is heat. It increases temperature. It flows…

Q: Which temperature scale would astronomers be least likely to use when reporting the temperature on…

A: The astronomers use the Kelvin scale to determine the temperature on the surface of the moon Titan…

Q: When you step from the shade into the sunlight, the Sun’s heat is as evident as the heat from hot…

A: Radius of sun (Rsun) = 6.96×108 mDistance between moon and earth (DME) = 3.84×108 m

Q: Why is it possible to hold a lighted match stick until the flame burns quite close to the fingers?

A: The match stick is made up of wood which is the bad conductor of heat. When the lighted match stick…

Q: Why are icebergs often surrounded by fogs?

A: Condensation can be defined as the change of phase of water from gaseous to liquid.

Q: Water vapor is an invisible gas. How can an increase in relative humidity affect visibility?

A: Water vapour is the gaseous condition of H2O that is imperceptible to the naked eye. Clouds are…

Q: Blackbody radiation is from a body that (a) does not emit radiation in the visible. (b) is black (c)…

A: Black-body radiation is from the body that absorb and then emits all the radiation falling on it.

Q: A steel rod A is 0.5 m long with cross-sectional area of 0.75 cm2. A steel rod B is 1.0 m long with…

A: Given Information:- For rod A  Length L = 0.5 m Cross-sectional Area A = 0.75 cm2 =0.75 ×10-4 m2 For…

Q: In an old house, the heating system uses radiators, which are hollow metal devices through which hot…

A: Given information:

Q: Why firewalkers dont burn their wetted feet when they walk barefoot on red-hot coals

A:

Q: What makes the tile floor so much cooler than the bathroom mat when I walk out of the shower?

A: The thermal conductivity of tiles is greater than that of the mat. It implies that heat can be…

Q: Why are such materials as wood, fur, feathers, and even snow good insulators?

A: The materials which allow the free passage of electricity through them with very low resistance are…

Q: Consider two black bodies at temperatures T1 and T2 (T1 > T2) having same surface area (A), are…

A: The rate of radiant heat transfer from a surface is Er = eσAT4then the rate of heat transfer from…

Q: Some environmentally conscious people build their homes in the shape of a dome. Why is less heat…

A: Some people build their homes in the shape of a dome.

Q: coloring

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: Explain why the 2-4 inch thick layer of blubber on a polar bear helps to keep polar bears warm…

A: Blubber is a thick layer of adipose tissue. Polar bears store extra digested food in the form of…

Q: Why is it safe to remain inside a car during a lightening storm?

A: During a lightning storm, it is safer to sit inside a car rather than standing under a tree. This…

Q: s heat and light considered as a matter? Why? Why not

A: Heat is a form of energy. It is felt when there is difference in temperature of two bodies. Light is…

Q: Why the sand is much hotter compared to water in the beach if they are exposed with the same source…

A: Specific heat capacity: It is defined as, the amount of heat energy required to raise the…

Q: Why do clouds often form above mountain peaks?

A: At the mountain peak the atmospheric pressure is lower than the pressure at ground. The hot air…

Q: Why do we wear white or light coloured clothes in summer and dark coloured clothes in winter?

A: White or light coloured clothes reflects light, which is reflects heat. So it helps to possess our…

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

A: Despite of being under the shade or umbrella, one can get the sunburns at the beach because…

Q: Why is the sky darker blue when you are at high altitudes?

A: The blue wavelength of sunlight are preferentially scattered by the Earth’s atmosphere. So generally…

Q: 19. Saniya lives in a cold climate. In the winter, her attic gets extremely cold. She has decided to…

A: We know that the winter is the coldest season of the year in polar.

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: When watching a daytime circus in a large, dark-colored tent, you sense significant heat transfer…

A: Heat transfer method of radiation:   A black body is a good absorber and a good radiator.   During…

Q: Use eqn. 8.4 (F = σT4) to show why the total flux of solar radiant energy is about 105 times greater…

A:

Q: An object emits 30 Watts of power. If it were a perfect black body, other things are being equal, it…

A: Let the intensity of the radiation of an object is denoted by I, ε denotes the emissivity of the…

Q: Identify whether the given situations are examples of conduction, convection or radiation. a. Solar…

A: a. Solar ultraviolet radiation, precisely the process that determines the Earth's temperature. It is…

Q: Which of the following statements is correct?

A: ANS: The water in Glass A is warmer than the water in Glass B; therefore, the particles in Glass A…

Q: Why will clouds tend to form above either a flat or a mountainous island in the middle of the ocean?…

A:

Q: On a cold day, after you scraped your windshield and g condensation on the inside of the windshield.…

A: Given:- On a cold day, after you scraped your windshield and get into your car, you…

Q: Identify whether the given situations are examples of conduction, convection or radiation. a.…

A: a. Solar ultraviolet radiation, precisely the process that determines the Earth's temperature. It is…

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

A:

Q: When you step inside a warm ski lodge on a cold day, you find your eyeglasses fog. Why does this…

A: Due to condensation fog can be found on eyeglass.

Q: What is the reason for the widespread use of fins on surfaces?

A: The phenomenon through which heat transfer from one body to another due to temperature difference is…

Q: The bulb of one thermometer is spherical while that of other is cylindrical. Both have equal amount…

A: The surface area of the cylindrical bulb will be more compared to the spherical bulb. Both the bulbs…

Q: A glass louvre pane 0.4 cm thick has an area of 2×104cm2 . On a very cold day the temperature…

A: Given data : Thickness of glass lourve, L = 0.4 cm = 0.004 m Area, A =  2×104 cm2  = 2×104 ×10-4 = 2…