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Types of Objects

All bodies wh...

Question

All bodies which emit light energy by themselves, are called transparent bodies.

A

True

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B

False

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Solution

The correct option is B False
The bodies which emit light energy by themselves are called luminous bodies.
Example:- stars, burning candles, etc.
Transparent bodies are those bodies that can pass light through them.
Example: glass, air, clean water, etc.
Hence, the given statement is false.

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Q. Fill in the blanks using the correct word given in the bracket:
1. Light is a form of ............................ . (energy/electricity)
2. All bodies which emit light energy by themselves are called ............................ bodies. (luminous/opaque)
3. Light travels in a ............................ line. (straight/curved)
4. A glowing electric bulb is an example of ............................ source of light. (natural/artificial)
5. Any polished surface from which regular reflection takes place is called a ............................ . (mirror/obstacle)
6. Reflection from a mirror gives clear ............................ . (image/shadow)
7. The shadow of a coloured object is ............................ . (coloured/black)
8. The image formed by a mirror is due to ............................ of light. (reflection/ propagation)

A body which emits light by itself is called ___ .

Q. Assertion :All bodies emit radiant energy whether they are solid,liquid or gases. Reason: Black bodies absorb and emit radiant energy better than bodies of lighter colours.

Q. All bodies emit heat energy from their surfaces by virtue of their temperature. This heat energy is called radiant energy of thermal radiation. The heat that we receive from the sun is transferred to us by a process which, unlike conduction or convection, does not require the help of a medium in the intervening space which is almost free of particles. Radiant energy travels in space as electromagnetic spectrum. Thermal radiations travel through vacuum with the speed of light. Thermal radiations obey the same laws of reflection and refraction as light does. They exhibit the phenomena of interference, diffraction and polarization as light does.
The emission of radiation from a hot body is expressed in terms of that emitted from a reference body (called the black body) at the same temperature. A black body absorbs and hence emits radiations of all wavelengths. The total energy E emitted by a unit area of a black body per second is given by

E = σ T^{4}

where T is the absolute temperature of the body and

σ

is a constant known as Stefan's constant. If the body is not a perfect black body, then

E = ε σ T^{4}

ε

is the emissivity of the body.
The rate at which energy is radiated by a body depends upon :

The bodies which give .......................... energy of their own, are called luminous bodies.

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