155758
The frequency of electromagnetic wave, which is best suited to observe a particle of radius $3 \times$ $10^{-4} \mathrm{~cm}$, is of the order of
155761
The energy of the EM waves is of the order of $15 \mathrm{keV}$. To which part of the spectrum does it belong?
1 X-rays
2 Infrared rays
3 Ultraviolet rays
4 $\gamma$-rays
Explanation:
A Given, $\mathrm{E}=15 \mathrm{keV}$ The wavelength of the emitted EM waves is $\lambda=\frac{h c}{E}$ $=\frac{6.626 \times 10^{-34} \times 3 \times 10^{8}}{15 \times 10^{3} \times 1.6 \times 10^{-19}}$ $=0.828 \times 10^{-10}$ $=0.0828 \mathrm{~nm}$ Since the order of wavelength between $10 \mathrm{~nm}$ to 0.001 $\mathrm{nm}$ So, it belongs to X-ray part of the spectrum.
AIPMT- 2015
Electromagnetic Wave
155684
Among the following, which is not true for ultraviolet light?
1 induces the production of more melanin, causing tanning of the skin
2 can be focused into very narrow beams
3 kills germs in water purifiers
4 used in eye surgery
5 treatment for certain forms of cancer
Explanation:
E Uses of UV light- (i) It destroy germs and bacteria and hence they are used for sterilizing surgical instruments and for purification of water. (ii) It can be focused into very narrow beams (iii) It is used in eye surgery. Therefore, treatment for certain forms of cancer is not true for ultraviolet light
Kerala CEE 2020
Electromagnetic Wave
155697
The spectrum formed by an ordinary tubelight is a /an
1 line spectrum
2 continuous spectrum
3 absorption spectrum
4 band spectrum
Explanation:
A Spectrum is the range of wavelengths and frequencies that are associated with source light. For instance, white light has 7 colours in the spectrum. Inside a tubelight the gas contains vapour of metals. In metallic atoms, electronic transition takes place due to which light of a particular wavelength is emitted. A hot gas only emits certain wavelengths of light to produce bright lines on a dark background. And this is called a line emission spectrum. Hence, line spectrum is formed by an ordinary tubelight.
155758
The frequency of electromagnetic wave, which is best suited to observe a particle of radius $3 \times$ $10^{-4} \mathrm{~cm}$, is of the order of
155761
The energy of the EM waves is of the order of $15 \mathrm{keV}$. To which part of the spectrum does it belong?
1 X-rays
2 Infrared rays
3 Ultraviolet rays
4 $\gamma$-rays
Explanation:
A Given, $\mathrm{E}=15 \mathrm{keV}$ The wavelength of the emitted EM waves is $\lambda=\frac{h c}{E}$ $=\frac{6.626 \times 10^{-34} \times 3 \times 10^{8}}{15 \times 10^{3} \times 1.6 \times 10^{-19}}$ $=0.828 \times 10^{-10}$ $=0.0828 \mathrm{~nm}$ Since the order of wavelength between $10 \mathrm{~nm}$ to 0.001 $\mathrm{nm}$ So, it belongs to X-ray part of the spectrum.
AIPMT- 2015
Electromagnetic Wave
155684
Among the following, which is not true for ultraviolet light?
1 induces the production of more melanin, causing tanning of the skin
2 can be focused into very narrow beams
3 kills germs in water purifiers
4 used in eye surgery
5 treatment for certain forms of cancer
Explanation:
E Uses of UV light- (i) It destroy germs and bacteria and hence they are used for sterilizing surgical instruments and for purification of water. (ii) It can be focused into very narrow beams (iii) It is used in eye surgery. Therefore, treatment for certain forms of cancer is not true for ultraviolet light
Kerala CEE 2020
Electromagnetic Wave
155697
The spectrum formed by an ordinary tubelight is a /an
1 line spectrum
2 continuous spectrum
3 absorption spectrum
4 band spectrum
Explanation:
A Spectrum is the range of wavelengths and frequencies that are associated with source light. For instance, white light has 7 colours in the spectrum. Inside a tubelight the gas contains vapour of metals. In metallic atoms, electronic transition takes place due to which light of a particular wavelength is emitted. A hot gas only emits certain wavelengths of light to produce bright lines on a dark background. And this is called a line emission spectrum. Hence, line spectrum is formed by an ordinary tubelight.
155758
The frequency of electromagnetic wave, which is best suited to observe a particle of radius $3 \times$ $10^{-4} \mathrm{~cm}$, is of the order of
155761
The energy of the EM waves is of the order of $15 \mathrm{keV}$. To which part of the spectrum does it belong?
1 X-rays
2 Infrared rays
3 Ultraviolet rays
4 $\gamma$-rays
Explanation:
A Given, $\mathrm{E}=15 \mathrm{keV}$ The wavelength of the emitted EM waves is $\lambda=\frac{h c}{E}$ $=\frac{6.626 \times 10^{-34} \times 3 \times 10^{8}}{15 \times 10^{3} \times 1.6 \times 10^{-19}}$ $=0.828 \times 10^{-10}$ $=0.0828 \mathrm{~nm}$ Since the order of wavelength between $10 \mathrm{~nm}$ to 0.001 $\mathrm{nm}$ So, it belongs to X-ray part of the spectrum.
AIPMT- 2015
Electromagnetic Wave
155684
Among the following, which is not true for ultraviolet light?
1 induces the production of more melanin, causing tanning of the skin
2 can be focused into very narrow beams
3 kills germs in water purifiers
4 used in eye surgery
5 treatment for certain forms of cancer
Explanation:
E Uses of UV light- (i) It destroy germs and bacteria and hence they are used for sterilizing surgical instruments and for purification of water. (ii) It can be focused into very narrow beams (iii) It is used in eye surgery. Therefore, treatment for certain forms of cancer is not true for ultraviolet light
Kerala CEE 2020
Electromagnetic Wave
155697
The spectrum formed by an ordinary tubelight is a /an
1 line spectrum
2 continuous spectrum
3 absorption spectrum
4 band spectrum
Explanation:
A Spectrum is the range of wavelengths and frequencies that are associated with source light. For instance, white light has 7 colours in the spectrum. Inside a tubelight the gas contains vapour of metals. In metallic atoms, electronic transition takes place due to which light of a particular wavelength is emitted. A hot gas only emits certain wavelengths of light to produce bright lines on a dark background. And this is called a line emission spectrum. Hence, line spectrum is formed by an ordinary tubelight.
NEET Test Series from KOTA - 10 Papers In MS WORD
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Electromagnetic Wave
155758
The frequency of electromagnetic wave, which is best suited to observe a particle of radius $3 \times$ $10^{-4} \mathrm{~cm}$, is of the order of
155761
The energy of the EM waves is of the order of $15 \mathrm{keV}$. To which part of the spectrum does it belong?
1 X-rays
2 Infrared rays
3 Ultraviolet rays
4 $\gamma$-rays
Explanation:
A Given, $\mathrm{E}=15 \mathrm{keV}$ The wavelength of the emitted EM waves is $\lambda=\frac{h c}{E}$ $=\frac{6.626 \times 10^{-34} \times 3 \times 10^{8}}{15 \times 10^{3} \times 1.6 \times 10^{-19}}$ $=0.828 \times 10^{-10}$ $=0.0828 \mathrm{~nm}$ Since the order of wavelength between $10 \mathrm{~nm}$ to 0.001 $\mathrm{nm}$ So, it belongs to X-ray part of the spectrum.
AIPMT- 2015
Electromagnetic Wave
155684
Among the following, which is not true for ultraviolet light?
1 induces the production of more melanin, causing tanning of the skin
2 can be focused into very narrow beams
3 kills germs in water purifiers
4 used in eye surgery
5 treatment for certain forms of cancer
Explanation:
E Uses of UV light- (i) It destroy germs and bacteria and hence they are used for sterilizing surgical instruments and for purification of water. (ii) It can be focused into very narrow beams (iii) It is used in eye surgery. Therefore, treatment for certain forms of cancer is not true for ultraviolet light
Kerala CEE 2020
Electromagnetic Wave
155697
The spectrum formed by an ordinary tubelight is a /an
1 line spectrum
2 continuous spectrum
3 absorption spectrum
4 band spectrum
Explanation:
A Spectrum is the range of wavelengths and frequencies that are associated with source light. For instance, white light has 7 colours in the spectrum. Inside a tubelight the gas contains vapour of metals. In metallic atoms, electronic transition takes place due to which light of a particular wavelength is emitted. A hot gas only emits certain wavelengths of light to produce bright lines on a dark background. And this is called a line emission spectrum. Hence, line spectrum is formed by an ordinary tubelight.
