Question

The wavelength range of the visible spectrum extends from violet (400 mm) to red (750 mm) Express these wavelength in frequencies (Hz)

Answer 1

Answer:

see the attachment.... xd......

Answer 2

Question :-

The wavelength range of the visible spectrum extends from violet (400 nm) to red (750 nm) Express these wavelength in frequencies (Hz)

AnSwer :-

Given :-

wavelength of violet = 400nm

= 400 × 10$^{-19}$m

wavelength of red = 750 nm

= 750 × 10$^{-19}$m

To find :-

the range of visible spectrum formed

Solution :-

Frequency of violet light :-

$\sf v = \dfrac{c}{ \lambda} = \dfrac{3.00 \times {10}^{8} {ms}^{ - 1} }{400 \times {10}^{ - 9}m } = 7.50 \times {10}^{ 14} hz$

frequency of red light :-

$\sf v = \dfrac{c}{ \lambda} = \dfrac{3.00 \times {10}^{8} {ms}^{ - 1} }{750 \times {10}^{ - 9}m } = 4.00 \times {10}^{14}$

The range of visible spectrum is from 4.0 × 10¹⁴ to 7.50 × 10¹⁴ Hz in terms of frequency

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Know more :-

wavelength (λ) :-

$\Large\star$ the distance between two similar point in a wave is known as wavelength. The unit of wavelength are m, cm, Å, Nm.

Frequency (v) :-

$\Large\star$The number of waves that pass through a given point in one second is called frequency.

SI units are Hertz (Hz) or cycle per second (cps)

frequency (v) and wavelength (λ) are related as

$\sf v = \dfrac{c}{ \lambda}$

Where C = velocity of light = 3 × 10⁸ m/s