A The flash spectrum is an emission spectrum, mainly due to light coming from the lowermost layer of the solar atmosphere. It is an array of wavelengths detectable within the emissions from the limb of the sun during the flash periods of a few seconds after the start of totality during the solar eclipse or before the moment of its termination. So, the flash spectrum confirms a total solar eclipse.
Karnataka CET-2011
Electromagnetic Wave
155741
White light is passed through a dilute solution of potassium permanganate. The spectrum produced by the emergent light is :
1 band emission spectrum
2 line emission spectrum
3 band absorption spectrum
4 line absorption spectrum
Explanation:
C When the ray of white light passes through a dilute solution of potassium permanganate some part of light are absorbed and wavelength will be missing in the corresponding spectrum which results in a band absorption spectrum in the emergent rays.
Karnataka CET-2006
Electromagnetic Wave
155742
Pick out the statement which is not true ?
1 UV radiations are used for sterilization of water
2 Shortest wavelength UV radiations are beneficial to living tissues while longer wavelengths UV are harmful
3 UV radiations have wavelengths extending from $200 \mathrm{~nm}$ to $400 \mathrm{~nm}$
4 Sun is a natural source of UV radiations
Explanation:
B The three types of UV radiation are classified according to their wavelength. They differ in their biological activity and the extent to which they can penetrate the skin. The shorter the wavelength, more harmful the UV radiation, however, shorter wavelength UV radiation is less able to penetrate the skin.
Karnataka CET-2001
Electromagnetic Wave
155744
Mercury vapour lamp gives
1 continuous spectrum
2 line spectrum
3 band spectrum
4 absorption spectrum
Explanation:
B When atoms are excited they emit light of certain wavelengths which correspond to different colors. The emitted light can be observed as a series of colored lines with dark spaces in between; this series of colored lines is called line spectrum. A mercury vapour-lamp is a gas discharge lamp that uses an electric arc through vaporized mercury to produce light and when subjected to dispersion gives line emission spectrum.
A The flash spectrum is an emission spectrum, mainly due to light coming from the lowermost layer of the solar atmosphere. It is an array of wavelengths detectable within the emissions from the limb of the sun during the flash periods of a few seconds after the start of totality during the solar eclipse or before the moment of its termination. So, the flash spectrum confirms a total solar eclipse.
Karnataka CET-2011
Electromagnetic Wave
155741
White light is passed through a dilute solution of potassium permanganate. The spectrum produced by the emergent light is :
1 band emission spectrum
2 line emission spectrum
3 band absorption spectrum
4 line absorption spectrum
Explanation:
C When the ray of white light passes through a dilute solution of potassium permanganate some part of light are absorbed and wavelength will be missing in the corresponding spectrum which results in a band absorption spectrum in the emergent rays.
Karnataka CET-2006
Electromagnetic Wave
155742
Pick out the statement which is not true ?
1 UV radiations are used for sterilization of water
2 Shortest wavelength UV radiations are beneficial to living tissues while longer wavelengths UV are harmful
3 UV radiations have wavelengths extending from $200 \mathrm{~nm}$ to $400 \mathrm{~nm}$
4 Sun is a natural source of UV radiations
Explanation:
B The three types of UV radiation are classified according to their wavelength. They differ in their biological activity and the extent to which they can penetrate the skin. The shorter the wavelength, more harmful the UV radiation, however, shorter wavelength UV radiation is less able to penetrate the skin.
Karnataka CET-2001
Electromagnetic Wave
155744
Mercury vapour lamp gives
1 continuous spectrum
2 line spectrum
3 band spectrum
4 absorption spectrum
Explanation:
B When atoms are excited they emit light of certain wavelengths which correspond to different colors. The emitted light can be observed as a series of colored lines with dark spaces in between; this series of colored lines is called line spectrum. A mercury vapour-lamp is a gas discharge lamp that uses an electric arc through vaporized mercury to produce light and when subjected to dispersion gives line emission spectrum.
A The flash spectrum is an emission spectrum, mainly due to light coming from the lowermost layer of the solar atmosphere. It is an array of wavelengths detectable within the emissions from the limb of the sun during the flash periods of a few seconds after the start of totality during the solar eclipse or before the moment of its termination. So, the flash spectrum confirms a total solar eclipse.
Karnataka CET-2011
Electromagnetic Wave
155741
White light is passed through a dilute solution of potassium permanganate. The spectrum produced by the emergent light is :
1 band emission spectrum
2 line emission spectrum
3 band absorption spectrum
4 line absorption spectrum
Explanation:
C When the ray of white light passes through a dilute solution of potassium permanganate some part of light are absorbed and wavelength will be missing in the corresponding spectrum which results in a band absorption spectrum in the emergent rays.
Karnataka CET-2006
Electromagnetic Wave
155742
Pick out the statement which is not true ?
1 UV radiations are used for sterilization of water
2 Shortest wavelength UV radiations are beneficial to living tissues while longer wavelengths UV are harmful
3 UV radiations have wavelengths extending from $200 \mathrm{~nm}$ to $400 \mathrm{~nm}$
4 Sun is a natural source of UV radiations
Explanation:
B The three types of UV radiation are classified according to their wavelength. They differ in their biological activity and the extent to which they can penetrate the skin. The shorter the wavelength, more harmful the UV radiation, however, shorter wavelength UV radiation is less able to penetrate the skin.
Karnataka CET-2001
Electromagnetic Wave
155744
Mercury vapour lamp gives
1 continuous spectrum
2 line spectrum
3 band spectrum
4 absorption spectrum
Explanation:
B When atoms are excited they emit light of certain wavelengths which correspond to different colors. The emitted light can be observed as a series of colored lines with dark spaces in between; this series of colored lines is called line spectrum. A mercury vapour-lamp is a gas discharge lamp that uses an electric arc through vaporized mercury to produce light and when subjected to dispersion gives line emission spectrum.
A The flash spectrum is an emission spectrum, mainly due to light coming from the lowermost layer of the solar atmosphere. It is an array of wavelengths detectable within the emissions from the limb of the sun during the flash periods of a few seconds after the start of totality during the solar eclipse or before the moment of its termination. So, the flash spectrum confirms a total solar eclipse.
Karnataka CET-2011
Electromagnetic Wave
155741
White light is passed through a dilute solution of potassium permanganate. The spectrum produced by the emergent light is :
1 band emission spectrum
2 line emission spectrum
3 band absorption spectrum
4 line absorption spectrum
Explanation:
C When the ray of white light passes through a dilute solution of potassium permanganate some part of light are absorbed and wavelength will be missing in the corresponding spectrum which results in a band absorption spectrum in the emergent rays.
Karnataka CET-2006
Electromagnetic Wave
155742
Pick out the statement which is not true ?
1 UV radiations are used for sterilization of water
2 Shortest wavelength UV radiations are beneficial to living tissues while longer wavelengths UV are harmful
3 UV radiations have wavelengths extending from $200 \mathrm{~nm}$ to $400 \mathrm{~nm}$
4 Sun is a natural source of UV radiations
Explanation:
B The three types of UV radiation are classified according to their wavelength. They differ in their biological activity and the extent to which they can penetrate the skin. The shorter the wavelength, more harmful the UV radiation, however, shorter wavelength UV radiation is less able to penetrate the skin.
Karnataka CET-2001
Electromagnetic Wave
155744
Mercury vapour lamp gives
1 continuous spectrum
2 line spectrum
3 band spectrum
4 absorption spectrum
Explanation:
B When atoms are excited they emit light of certain wavelengths which correspond to different colors. The emitted light can be observed as a series of colored lines with dark spaces in between; this series of colored lines is called line spectrum. A mercury vapour-lamp is a gas discharge lamp that uses an electric arc through vaporized mercury to produce light and when subjected to dispersion gives line emission spectrum.
