Physics - Study Mode

[#826] Transition ions absorb light in :
Correct Answer

(D) Visible region

Explanation

Solution: Transition metal ions have an incomplete set of 3d electrons. Changes in the energy of these electrons correspond to the energy of visible light. The absorption of visible light by these ions lend colour to gems.

[#827] Heat from the Sun reaches the Earth by
Correct Answer

(C) Radiation

Explanation

Solution: Radiation is the transfer of heat energy through space by electromagnetic radiation. Most of the electromagnetic radiation that comes to the earth from the sun is invisible.

[#828] Heat transfer by conduction occurs when molecules
Correct Answer

(A) Collide

Explanation

Solution: Conduction is the transfer of heat between substances that are in direct contact with each other. Conduction occurs when a substance is heated, particles will gain more energy, and vibrate more. These molecules then bump into nearby particles and transfer some of their energy to them.

[#829] A body absorbs heat most if it is
Correct Answer

(A) Black and rough

Explanation

Solution: A body absorbs heat most if it is black and rough.

[#830] A black body can absorb radiations of :
Correct Answer

(D) All wavelengths

Explanation

Solution: A black body can absorb radiations of all wavelengths.