Visible Rays

Q.

Why the sea is blue?

Q.

What are the four laws of radiation?

Q.

Which one has larger wavelength, red or blue light?

1. Blue light

2. Red light

3. Both have same wavelength

4. Depends on the source of these light

Q.

The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light

1. is scattered the most by smoke or fog

2. is scattered the least by smoke or fog

3. is absorbed the most by smoke or fog

4. moves fastest in air

Q.

Which of the following are the properties of Visible light?

1. They have the wavelength in the range of 400–700 nanometers.

2. It is responsible for the sense of sight.

3. It is an electromagnetic radiation.

4. It is not responsible for the sense of sight.

Q.

White light is considered to be

1. Monochromatic in nature

2. Polychromatic in nature

3. Neither Monochromatic nor Polychromatic in nature

4. Both Monochromatic and Polychromatic in nature

Q. Arrange in the correct order the colours of white light obtained after dispersion.

1. Red
2. Blue
3. Orange
4. Green
5. Violet

Q.

Every hot object emits

1. infrared rays

2. visible rays

3. X-rays

4. all of the above

Q.

Write the seven prominent colours present in white light in the order of increasing wavelength

Q. Hole is a fundamental particle of an atom.

1. 25 Hz
2. 50 Hz

Q.

Which of the following statements is/are true in dispersion?

I: Refractive index for violet colour is maximum

II: Deviation produced for red colour is minimum

III: The wavelength for green colour is greater than that for blue colour

1. I and II only

2. II and III only

3. I and III only

4. All the statements

Q. Will dispersion takes place in our eye when white light pass through our eye?when white light pass from one mediam to another dispersion takes place?so, when white light enters our eye there are two Mediams air and aqueous humour , so the light would dispersdispers
so during noon the sun should appear colourful like rainbow????
Why is not happening??

Q.

Is the sun a coherent source?

Q. What is the proper meaning of light or what is ligth

Q. A beam of white light falling on a glass prism gets split into seven colours marked 1 to 7 as shown in the diagram. From given spectrum, the numbers for corresponding colours that deviates more than yellow but less than indigo are

काँच के एक प्रिज्म पर आपतित श्वेत प्रकाश का एक पुंज सात रंगों, जिन पर चित्रानुसार 1 से 7 अंकित हैं, में विभक्त हो जाता है। दिए गए स्पेक्ट्रम से, पीले से अधिक लेकिन जामुनी से कम विचलित होने वाले संगत रंगों के लिए संख्याएं हैं

1. 2, 3
2. 1, 2, 7
3. 4, 5, 7
4. 4, 5

Q.

Three coloured bands blue, green & red are painted at the bottom of a swimming pool. Which band will appear to be raised the most & why?

1. Blue

2. Red

3. Green

4. All the bands will rise to the same height

5. None the bands will appear to be raised as they will merge to form white light

Q.

Infrared radiations are used for

1. Night Vision Photography

2. Detecting Fractures in bones

3. Radiation Therapy in Cancer

4. Detection of fake Currency

Q. Fill in the blanks with suitable words
The range of wavelength of visible light is __________.

Q.

The process of creating various colours of light by mixing the three primary colours is known as _____

Q.

Name the following:

Process of creating various colours of light by mixing the three primary colours.

Q.

Name the following.

Any three colours of light that produce white light when combined in the correct intensity.

Q.

What are the four colours of the spectrum of white light which have a wavelength longer than blue light?

1. Green, Yellow, Orange, Violet

2. Green, Yellow, Indigo, Red

3. Green, Yellow, Orange, Red

4. Green, Yellow, Indigo, Orange

Q. Why is frequency of cyclotron f and not 2f even if charged particle is taking half revolution in dee??

Q. How many colours comprises white light?

1. One
2. Two
3. Five
4. Seven

Q. Visible light has wavelengths between ________ and ________.

1. 500 nm and 900 nm
2. 10 nm and 100 nm
3. 400 nm and 800 nm
4. 100 nm and 200 nm

Q. Monochromatic light refers to light that has:

1. only one colour
2. no colour
3. white and orange colour
4. red and blue colour

Q. In the spectrum of visible light produced by a prism, dispersion is

1. Uniform throughout the spectrum
2. Maximum in the middle, decreases on either sides
3. Maximum towards violet
4. Maximum towards yellow

Q. For an electromagnetic radiation,

1. only momentum is quantised
2. only energy is quantised
3. both energy and momentum are
   quantised
4. neither of them is quantised

Q. _____ light creates intense heating when it is incident on a substance

1. visible
2. ultra violet
3. Infra red
4. X-ray

Q.

A white light is a mixture of

1. Three primary colours

2. Eight colours

3. Seven colours

4. Nine colours