155700
A piece of blue glass heated to a high temperature and a piece of red glass at room temperature are taken inside a dimly-lit room. Then,
1 the blue piece will look blue and the red piece will look red as usual.
2 the red piece will look brighter red and the blue piece will look ordinary blue.
3 the blue will look brighter as compared to the red piece.
4 both the pieces will look equal red.
Explanation:
C According to Stefan's law energy emitted by a body per second, $\mathrm{E} \propto \mathrm{T}^{4}$ Since, the blue glass piece is heated at higher temperature compared to the red one. So the blue glass absorbs all the radiation of higher wavelength except blue. So, when it is taken in a dark room it emits the radiation which absorbed and appears brighter than the red glass piece.
JIPMER-2017
Electromagnetic Wave
155704
Which one among the following waves carries the maximum energy per photon?
1 X-rays
2 Radio waves
3 Light waves
4 Microwaves
Explanation:
A Energy of a photon is given by, $\mathrm{E}=\frac{\mathrm{hc}}{\lambda}$ where, $\mathrm{h}=$ planck constant $\mathrm{c}=$ speed of light $\lambda=$ wave length of the photon. According to the electromagnetic spectrum, the order of wavelengths of different radiations are- $\lambda_{\mathrm{x} \text {-rays }} \lt \lambda_{\text {visible light }} \lt \lambda_{\text {microwave }} \lt \lambda_{\text {radio wave }}$. As energy is inversely proportional to the wavelength of the photon and wavelength of X-rays is minimum out of all the above four waves, hence the energy of x-rays will be maximum.
NDA (II) 2017
Electromagnetic Wave
155715
Laser light has following property
1 laser light always lies in X-rays region
2 laser light does not have directionality property
3 laser light is white light
4 laser light is highly coherent
Explanation:
D Properties of laser light, (i) Monochromatic: concentrate in a narrow range of wavelength i.e. one specific colour. (ii) Coherent: All the emitted photons be a constant phase relationship with each other in both time and phase. (iii) Directional: A very tight which is very strong and concentrated.
UPSEE - 2016
Electromagnetic Wave
155719
In gamma ray emission from a nucleus
1 both the neutron number and the proton number change
2 there is no change in the proton number and the neutron number
3 only the neutron number changes
4 only the proton number changes
Explanation:
B In gamma rays, emission no particle is being emitted. Only the gamma radiation is emitted. We know that radiation is an electromagnetic wave which only carries energy with it. No charge or mass is carried by the electromagnetic waves. So neither the neutron number nor the proton number changes in the gamma a emission from a nucleus.
155700
A piece of blue glass heated to a high temperature and a piece of red glass at room temperature are taken inside a dimly-lit room. Then,
1 the blue piece will look blue and the red piece will look red as usual.
2 the red piece will look brighter red and the blue piece will look ordinary blue.
3 the blue will look brighter as compared to the red piece.
4 both the pieces will look equal red.
Explanation:
C According to Stefan's law energy emitted by a body per second, $\mathrm{E} \propto \mathrm{T}^{4}$ Since, the blue glass piece is heated at higher temperature compared to the red one. So the blue glass absorbs all the radiation of higher wavelength except blue. So, when it is taken in a dark room it emits the radiation which absorbed and appears brighter than the red glass piece.
JIPMER-2017
Electromagnetic Wave
155704
Which one among the following waves carries the maximum energy per photon?
1 X-rays
2 Radio waves
3 Light waves
4 Microwaves
Explanation:
A Energy of a photon is given by, $\mathrm{E}=\frac{\mathrm{hc}}{\lambda}$ where, $\mathrm{h}=$ planck constant $\mathrm{c}=$ speed of light $\lambda=$ wave length of the photon. According to the electromagnetic spectrum, the order of wavelengths of different radiations are- $\lambda_{\mathrm{x} \text {-rays }} \lt \lambda_{\text {visible light }} \lt \lambda_{\text {microwave }} \lt \lambda_{\text {radio wave }}$. As energy is inversely proportional to the wavelength of the photon and wavelength of X-rays is minimum out of all the above four waves, hence the energy of x-rays will be maximum.
NDA (II) 2017
Electromagnetic Wave
155715
Laser light has following property
1 laser light always lies in X-rays region
2 laser light does not have directionality property
3 laser light is white light
4 laser light is highly coherent
Explanation:
D Properties of laser light, (i) Monochromatic: concentrate in a narrow range of wavelength i.e. one specific colour. (ii) Coherent: All the emitted photons be a constant phase relationship with each other in both time and phase. (iii) Directional: A very tight which is very strong and concentrated.
UPSEE - 2016
Electromagnetic Wave
155719
In gamma ray emission from a nucleus
1 both the neutron number and the proton number change
2 there is no change in the proton number and the neutron number
3 only the neutron number changes
4 only the proton number changes
Explanation:
B In gamma rays, emission no particle is being emitted. Only the gamma radiation is emitted. We know that radiation is an electromagnetic wave which only carries energy with it. No charge or mass is carried by the electromagnetic waves. So neither the neutron number nor the proton number changes in the gamma a emission from a nucleus.
NEET Test Series from KOTA - 10 Papers In MS WORD
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Electromagnetic Wave
155700
A piece of blue glass heated to a high temperature and a piece of red glass at room temperature are taken inside a dimly-lit room. Then,
1 the blue piece will look blue and the red piece will look red as usual.
2 the red piece will look brighter red and the blue piece will look ordinary blue.
3 the blue will look brighter as compared to the red piece.
4 both the pieces will look equal red.
Explanation:
C According to Stefan's law energy emitted by a body per second, $\mathrm{E} \propto \mathrm{T}^{4}$ Since, the blue glass piece is heated at higher temperature compared to the red one. So the blue glass absorbs all the radiation of higher wavelength except blue. So, when it is taken in a dark room it emits the radiation which absorbed and appears brighter than the red glass piece.
JIPMER-2017
Electromagnetic Wave
155704
Which one among the following waves carries the maximum energy per photon?
1 X-rays
2 Radio waves
3 Light waves
4 Microwaves
Explanation:
A Energy of a photon is given by, $\mathrm{E}=\frac{\mathrm{hc}}{\lambda}$ where, $\mathrm{h}=$ planck constant $\mathrm{c}=$ speed of light $\lambda=$ wave length of the photon. According to the electromagnetic spectrum, the order of wavelengths of different radiations are- $\lambda_{\mathrm{x} \text {-rays }} \lt \lambda_{\text {visible light }} \lt \lambda_{\text {microwave }} \lt \lambda_{\text {radio wave }}$. As energy is inversely proportional to the wavelength of the photon and wavelength of X-rays is minimum out of all the above four waves, hence the energy of x-rays will be maximum.
NDA (II) 2017
Electromagnetic Wave
155715
Laser light has following property
1 laser light always lies in X-rays region
2 laser light does not have directionality property
3 laser light is white light
4 laser light is highly coherent
Explanation:
D Properties of laser light, (i) Monochromatic: concentrate in a narrow range of wavelength i.e. one specific colour. (ii) Coherent: All the emitted photons be a constant phase relationship with each other in both time and phase. (iii) Directional: A very tight which is very strong and concentrated.
UPSEE - 2016
Electromagnetic Wave
155719
In gamma ray emission from a nucleus
1 both the neutron number and the proton number change
2 there is no change in the proton number and the neutron number
3 only the neutron number changes
4 only the proton number changes
Explanation:
B In gamma rays, emission no particle is being emitted. Only the gamma radiation is emitted. We know that radiation is an electromagnetic wave which only carries energy with it. No charge or mass is carried by the electromagnetic waves. So neither the neutron number nor the proton number changes in the gamma a emission from a nucleus.
155700
A piece of blue glass heated to a high temperature and a piece of red glass at room temperature are taken inside a dimly-lit room. Then,
1 the blue piece will look blue and the red piece will look red as usual.
2 the red piece will look brighter red and the blue piece will look ordinary blue.
3 the blue will look brighter as compared to the red piece.
4 both the pieces will look equal red.
Explanation:
C According to Stefan's law energy emitted by a body per second, $\mathrm{E} \propto \mathrm{T}^{4}$ Since, the blue glass piece is heated at higher temperature compared to the red one. So the blue glass absorbs all the radiation of higher wavelength except blue. So, when it is taken in a dark room it emits the radiation which absorbed and appears brighter than the red glass piece.
JIPMER-2017
Electromagnetic Wave
155704
Which one among the following waves carries the maximum energy per photon?
1 X-rays
2 Radio waves
3 Light waves
4 Microwaves
Explanation:
A Energy of a photon is given by, $\mathrm{E}=\frac{\mathrm{hc}}{\lambda}$ where, $\mathrm{h}=$ planck constant $\mathrm{c}=$ speed of light $\lambda=$ wave length of the photon. According to the electromagnetic spectrum, the order of wavelengths of different radiations are- $\lambda_{\mathrm{x} \text {-rays }} \lt \lambda_{\text {visible light }} \lt \lambda_{\text {microwave }} \lt \lambda_{\text {radio wave }}$. As energy is inversely proportional to the wavelength of the photon and wavelength of X-rays is minimum out of all the above four waves, hence the energy of x-rays will be maximum.
NDA (II) 2017
Electromagnetic Wave
155715
Laser light has following property
1 laser light always lies in X-rays region
2 laser light does not have directionality property
3 laser light is white light
4 laser light is highly coherent
Explanation:
D Properties of laser light, (i) Monochromatic: concentrate in a narrow range of wavelength i.e. one specific colour. (ii) Coherent: All the emitted photons be a constant phase relationship with each other in both time and phase. (iii) Directional: A very tight which is very strong and concentrated.
UPSEE - 2016
Electromagnetic Wave
155719
In gamma ray emission from a nucleus
1 both the neutron number and the proton number change
2 there is no change in the proton number and the neutron number
3 only the neutron number changes
4 only the proton number changes
Explanation:
B In gamma rays, emission no particle is being emitted. Only the gamma radiation is emitted. We know that radiation is an electromagnetic wave which only carries energy with it. No charge or mass is carried by the electromagnetic waves. So neither the neutron number nor the proton number changes in the gamma a emission from a nucleus.