Infrared Rays

Q.

Which one of the following types of waves are used in a night vision apparatus?

1. Microwaves.

2. Radio Waves.

3. Infra-red Waves.

4. None Of The Above.

Q.

Name the radiations which are absorbed by the green house gases in the earth's atmosphere.

Q.

Which of the electromagnetic rays produce a high heating effect?

1. Gamma rays

2. Visible rays

3. Infrared rays

4. UV rays

Q.

Name two sources, each of infrared radiations and ultraviolet radiations.

Q.

State the name and the range of wavelength of the invisible electromagnetic waves beyond the red end of visible spectrum.

Q.

What is the ratio of speed of infrared and ultraviolet radiations in vacuum?

Q.

While proving mirror formula,

How will fv/uvf = uv-uf/uvf become 1/v+1/u=1/f in the next/step.

Q. What exactly are 1.quartz and 2.rock salt prisms ? Which range of wavelengths of the electromagnetic spectrum
​pass through each one of them?

Q.

Give two properties of infrared radiations which differ front the visible light.

Q.

Which wavelength of sun is used finally as electric energy?

1. Visible light

2. Radio waves

3. Microwaves

4. Infrared waves

Q.

The greenhouse effect is the phenomenon in which _______ radiations of long wavelength is given out from the surface of the earth are absorbed by its atmosphere gases to keep the environment at the earth’s surface and its lower atmosphere, warm.

1. Visible

2. X-ray

3. Infrared

4. Ultraviolet

Q.

what are the types of electromagnetic wave explain its importance

Q. Arrange the following electromagnetic waves in the order of their increasing wavelength:
(a) $\gamma -rays$
(b) Microwaves
(c) $X-rays$
(d) Radio waves
How are infra-red waves produced? What role does infra-red radiation play in (i) maintaining the Earth's warmth and (ii) physical therapy?

Q.

Which of the following are the properties of infrared radiation?

1. It is visible to human eyes.

2. They produce strong heating effect.

3. It is invisible to human eyes.

4. They do not produce any heating effect.

Q.

Describe black body radiation with proper example.

Q.

What are infrared radiations ? How are they detected ? State one uses of these radiations.

Q.

A radiation P is focused by a proper device on the bulb of a thermometer. Mercury in the thermometer shows a rapid increase. The radiation P is :

(a) infrared radiation

(b) visible light

(c) ultraviolet radiation

(d) X -rays.

Q.

A radiation X is focused by a particular device on the bulb of a thermometer and mercury in the thermometer shows a rapid increase. Name the radiation X.

Q. Mention two applications of infrared radiation.

Q. Give the range of wavelength of the electromagnetic waves visible to us.

1. $1000A^o$ to $4000A^o$
2. $8000A^o$ to $9000A^o$
3. $4000A^o$ to $8000A^o$
4. $400A^o$ to $800A^o$

Q.

The radiation 'P' is founded by a proper device on the bulb of a thermometer. Mercury in the thermometer shows a rapid increase. Name the radiation P.

1. X rays

2. Infrared radiation

3. Visible light

4. Ultraviolet radiation

Q. Write two important uses of infra-red waves.

Q. Assertion :Infrared radiation plays an important role in maintaining the average temperature of earth. Reason: Infrared radiations are sometimes referred to as heat waves.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q.

Velocity of disturbance transmitted in a medium is called ___ velocity .

1. Potential energy

2. Electrical energy

3. Kinetic energy

4. Nuclear energy

Q. Give two uses of Infrared Rays.

Q. To distinguish between real gems and artificial gems a merchant may use which of the following radiations?

1. Infrared rays
2. $\gamma$-rays
3. X-rays
4. Ultraviolet rays

Q. Name the rays or waves of highest frequency.

1. X-rays
2. UV rays
3. IR rays
4. Gamma rays

Q.

Name the wave which is used for taking photographs in the dark.

1. Visible light

2. Infrared rays

3. X rays

4. Gamma rays

Q. Name the region beyond the red end of the spectrum.

1. Ultra red
2. infra red
3. dark red
4. light red

Q. Which radiations are used in treatment of muscles ache?

1. Ultraviolet
2. Infrared
3. Microwave
4. X-rays