Physics - Study Mode

[#986] Energy in reflected light :
Correct Answer

(B) Increases with the increase in angle

Explanation

Solution: Reflected waves are simply those waves that are neither transmitted nor absorbed, but are reflected from the surface of the medium they encounter. The amount of incident-wave energy that is reflected from a surface depends on the nature of the surface and the angle at which the wave strikes the surface. The amount of wave energy reflected increases as the angle of incidence increases. The reflection of energy is the greatest when the wave is nearly parallel to the reflecting surface.

[#987] Conservation of energy refers to the fact that
Correct Answer

(B) Energy cannot be created or destroyed but can be converted from one form to another

Explanation

Solution: "Conservation of energy" refers to the fact that energy cannot be created or destroyed but can be converted from one form to another.

[#988] Which of the following causes adiabatic temperature changes in atmosphere?
Correct Answer

(C) Expansion and compression of the air

Explanation

Solution: Application of temperature changes in the atmosphere is in adiabatics, or temperature change which are caused by compressing or allowing air to expand.

[#989] Which of the following options correctly explains the term heat budget?
Correct Answer

(B) It is the balance between incoming and outgoing radiation

Explanation

Solution: Incoming heat being absorbed by the Earth, and outgoing heat escaping the Earth in the form of radiation are both perfectly balanced. If they were not balanced, then Earth would be getting either progressively warmer or progressively cooler with each passing year. This balance between incoming and outgoing heat is known as Earth’s heat budget.

[#990] Which one of the following is not a feature of Indifference Curve?
Correct Answer

(D) They are concave to each other

Explanation

Solution: Indifference curves are usually convex to the origin. In other words, the indifference curve is relatively flatter in its right-hand portion and relatively steeper in its left-hand portion. The degree of convexity of an indifference curve depends on the rate of fall in the marginal rate of substitution.