MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Blackbody

The spectrum ...

Question

The spectrum of radiation emitted by a substance that has absorbed energy is called emission spectrum.

A

True

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

B

False

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A
True

What is an emission spectrum exactly?

When a sample is subjected to heating or irradiation, it absorbs radiation or energy and gets excited. As the sample gives up the absorbed energy, the wavelength (or frequency) of the radiation emitted is recorded.

The arrangement of these radiations in the order of increasing wavelengths or decreasing frequencies is called emission spectrum.

Suggest Corrections

thumbs-up

0

Similar questions

The spectrm of radiation emitted by a substance that has absorbed energy is called emission spectrum.

Q. The emission spectrum is the spectrum emitted by a substance when electron drops from its excited (upper) state to the ground (lowest) state.

Q. Like the solar spectrum the spectra of stars show a continuous spectrum on which dark absorption lines are superimposed. The inner layer (called the photosphere) of the star emits radiations of all wavelengths, producing a continuous spectrum. When these radiations pass through the outer, relatively cooler, layer of the star, the radiation of certain wavelengths are selectively absorbed by this layer. This explains the dark lines in the spectrum of a star. The dark lines are characteristic of the substances present in the outer layer of the star.The surface temperature

T

of a star can be estimated by measuring the wavelengths

λ_{m}

at which the intensity of the emitted radiation is maximum and then using Wien's displacement law which states that

λ_{m}

=

b

b

is a constant called Wiens constant and the above relation is called Wiens Displacement Law which states that as the temperature increases, the maximum intensity of emission shifts (or is displaced) towards the shorter wavelengths. The value of constant b has been found experimentally to be

2.89 \times 10

^{- 3}

mK .
The spectrum of light received from a star is a

Q. Assertion :Emission of light during a chemical reaction is known as chemiluminescence. Reason: Some substances absorb radiation when exposed to it and immediately re-emit the energy absorbed.

Q. Like the solar spectrum the spectra of stars show a continuous spectrum on which dark aborption lines are superimposed. The inner layer (called the photosphere) of the star emits radiations of all wavelengthts, producing a continuous spectrum. When these radiations pass through the outer, relatively cooler, layer of the star, the radiations of certain wavelengths are selectively absorbed by this layer. This explains the dark lines in the spectrum of a star. The dark lines are charactreristic of the substances present in the outer layer of the star.The surface temperature T of a star can be estimated by measuring the wavelengths

λ_{m}

at which the intensity of the emitted radiation is maximum and then using Wiens displacement law which states that

λ_{m}

=

b where b is a constant called Wiens constant and the above relation is called Wiens Displacement Law which states that as the temperature increases, the maximum intensity of emission shifts (or is displaced) towards the shorter wavelengths. The value of constant b has been found experimentally to be 2.89 x 10

^{- 3}

mK .
The dark lines in the solar spectrum are due to the

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Radiation

PHYSICS

Watch in App

explore_more_icon

Explore more

Standard XII Physics

Join BYJU'S Learning Program

CrossIcon