The frequency range of visible light is from 3 . 75 × 10 14 Hz to 7 . 5 × 10 14 Hz . Calculate its wavelength range. Taking speed of light 3 × 10 8 m / s .

Wave speed is the distance a wave travels in a given amount of time, such as the number of meters it travels per second. Speed of light, c = 3 × 10 8 m / s Frequency range = 3 . 75 × 10 14 Hz to 7 . 5 × 10 14 Hz Speed of light = frequency × wavelength For frequency = 3 . 75 × 10 14 Hz λ = c ϑ = 8 × 10 - 7 m = 8000 A 0 For frequency = 7 . 5 × 10 14 Hz λ = c ϑ = 4 × 10 - 7 m = 4000 A 0 Wavelength range = 4000 A 0 to 8000 A 0

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Selina Icse Concise Physics For Class 10>Chapter 6 - Spectrum>EXERCISE-6(A)>Q 17

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Write the approximate wavelengths for red light.

Important Questions on Spectrum

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Selina Icse Concise Physics For Class 10>Chapter 6 - Spectrum>EXERCISE-6(A)>Q 18

Name the seven prominent colours of the white light spectrum in order of their increasing frequencies.

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Selina Icse Concise Physics For Class 10>Chapter 6 - Spectrum>EXERCISE-6(A)>Q 19

Write the name of four colours of the spectrum (band of seven colour) of white light that have wavelength longer than blue light.

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Selina Icse Concise Physics For Class 10>Chapter 6 - Spectrum>EXERCISE-6(A)>Q 1

When a white light ray falls on a prism, the ray at its first surface suffers:

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Selina Icse Concise Physics For Class 10>Chapter 6 - Spectrum>EXERCISE-6(A)>Q 2

In the spectrum of white light by a prism, the colour at the extreme end opposite to the base of prism is: (a) violet (b) yellow (c) red (d) blue

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Selina Icse Concise Physics For Class 10>Chapter 6 - Spectrum>EXERCISE-6(A)>Q 1

Calculate the frequency of yellow light of wavelength

550 nm

. The speed of light is

3 \times 10^{8} m / s

.

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Selina Icse Concise Physics For Class 10>Chapter 6 - Spectrum>EXERCISE-6(A)>Q 2

The frequency range of visible light is from

3.75 \times 10^{14} Hz

to

7.5 \times 10^{14} Hz

. Calculate its wavelength range. Taking speed of light

3 \times 10^{8} m / s

.

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Selina Icse Concise Physics For Class 10>Chapter 6 - Spectrum>EXERCISE-6(A)>Q 1

Give a list of at least five radiations, in order of their increasing frequencies, which make up the complete electromagnetic spectrum. Which of the radiation mentioned here has the highest penetrating power?

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Selina Icse Concise Physics For Class 10>Chapter 6 - Spectrum>EXERCISE-6(A)>Q 1

Which of the following radiation has the highest penetrating power: Infrared waves, Visible light, Ultraviolet, X-rays and Gamma rays?