Wavelength of Visible Light

Q.

What is the role of resistor in electric circuit ?

Q. Why does the cord of an electrical heater not glow while the heating elements does

Q.

What colour has the highest frequency?

Q. Light of two colours A and B pass through a glass prism A devities more than B from its path of incidence which colour has a higher speed in the prism

Q.

What do you understand by the term spectrum ?

Q. Which of the following colour of white light has the least wavelength ?
(a) red (b) orange (c) violet (d) blue

Q. Why Issac Newton kept the second prism inverted in recombination of the spectrum of white light?

Q. Why is the colour of the ambulance siren red?

1. Red colour is more catchy.
2. Red colour is the colour of emergency.
3. Red colour scatters less.
4. Red light does not refract at all.

Q. Which colour has maximum speed in glass?

1. Violet
2. Red
3. Yellow
4. Green

Q. Why do the component colours of incidet white light split into a spectrum while passing through a glass prism?

Q.

why does the red light is the fastest

Q.

The wavelength range of white light is :

(a) 4000 nm to 8000 nm

(b) 40 nm to 80 nm

(c) 400 nm to 800 nm

(d) 4 nm to 8 nm.

Q.

In a filament type light bulb, most of the electric power consumed appears as:
(a) visible light (b) infra - red - rays (c) ultravioley rays (d) fluorescent light

Q. why filament of a bulb should be thermally isolated

Q.

Name the subjective property of light related to its wavelength.

Q.

The wavelengths for the light of red and blue colors are nearly $7.8\times {10}^{-7}m$ and $4.8\times {10}^{-7}m$ respectively.

(a) Which color has the greater speed in a vacuum?

(b) Which color has the greater speed in glass?

Q. Out of the following, the colour of light having the maximum wavelength is :
(a) violet (b) indigo (c) green (d) orange

Q. When white light is passed through a prism, which among the following colours will bend the least?

1. Yellow
2. Red
3. Green
4. Orange

Q.

Which coloured light has largest wavelength in the visible spectrum?

1. Red

2. Green

3. Violet

4. Blue

Q. why cloud is white in colour

Q. Prism angle of prism is 10°. Their refractive index for red and voilet colour is 1.51 and 1.52 respectively.Then despersive power will be?

Q.

Write the approximate wavelength for (i) blue , and (ii) red light.

Q.

Why doesn't a glass slab show dispersion of light whereas a prism shows? Has it got something to do with the prism's shape??

Q.

The subjective property of light and sound which depends on the wavelength are:

1. Colour, pitch

2. Frequency

3. Speed, Frequency

4. Intensity

Q. Why wavelength depend upon colour?

Q.

Which has the larger wavelength, red or blue light?

1. Both have same wavelenght

2. Depends on the source of these light

3. Blue light

4. Red light

Q. Eye is more sensitive to yellow color. Why are then danger signals red?

Q. Name the subjective property of light related to its wavelength

Q. Consider the following statements:

1. White light on passing through a prism, disperses into seven colours, in a phenomenon called dispersion.


2. Different wavelengths of light are refracted at different angles in the same medium.

1. Both the statements are correct, and 2 is not the correct reason of 1.
2. Both the statements are correct, and 2 is the correct reason of 1.
3. Both statements are wrong.
4. Statement 1 is correct but statement 2 is not.

Q.

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