283075
According to Huygens' principle, during refraction of light from air to a denser medium:
1 Wavelength decreases but speed increases
2 Wavelength increases but speed decreases
3 Wavelength and speed increases
4 Wavelength and speed decreases
Explanation:
: Speed of light in denser medium- \(\mathrm{v}_{\mathrm{m}}=\frac{\mathrm{c}}{\text { refractive index }(\mu)}\) Wavelength of light in denser medium- \(\lambda_{\mathrm{m}}=\frac{\lambda}{\mu}\)When light ray goes from air to denser medium, then its wavelength and speed decreases because every medium have a different velocity of light.
Karnataka CET-2017
WAVE OPTICS
283076
When the same monochromatic ray of light travels through glass slab and through water, the number of waves in glass slab of thickness 6 cm is same as in water column of height \(7 \mathrm{~cm}\). If refractive index of glass is 1.5 then refractive index of water is
1 1.258
2 1.269
3 1.286
4 1.310
Explanation:
: Given, \(\mu_{\mathrm{g}}=1.5, \mathrm{~h}_{\mathrm{g}}=6 \mathrm{~cm}, \mathrm{~h}_{\mathrm{w}}=7 \mathrm{~cm}\) Number of waves in glass slab \(\left(\mathrm{n}_{\mathrm{g}}\right)=\) No. of waves in water column \(\left(\mathrm{n}_{\mathrm{w}}\right)\) \(\mu_{\mathrm{g}} \mathrm{h}_{\mathrm{g}}=\mu_{\mathrm{w}} \mathrm{h}_{\mathrm{w}}\) Where, \(\mu_{\mathrm{g}}=\) refractive index of glass \(\mu_w=\) refractive index of water \(\mu_w=\frac{\mu_{\mathrm{g}} \mathrm{h}_{\mathrm{g}}}{\mathrm{h}_{\mathrm{w}}}-\frac{1.5 \times 6}{7}=1.286\)
MHT-CET 2017
WAVE OPTICS
283077
Huygens' wave theory of light cannot explain
1 Diffraction phenomena
2 Interference phenomena
3 Photoelectric effect
4 Polarization of light
5 Propagation of light
Explanation:
: Huygens' wave theory of light:- A wave front propagates by creating wavelets that move forwards and recreate the wave front. It explains diffraction phenomenon, interference phenomenon, polarization of light, propagation of light reflection and refraction of light. Hence, Huygens' wave theory of light cannot explain photoelectric effect because it is due to particle nature of light.
Kerala CEE - 2017
WAVE OPTICS
283078
For a radiation of \(9 \mathrm{GHz}\) passing through air. The number of waves passing through \(1 \mathrm{~m}\) length is
1 30
2 5
3 20
4 3
Explanation:
: Given that, \(\mathrm{f}=9 \mathrm{GHz}=9 \times 10^9 \mathrm{~Hz}\), length \(=1 \mathrm{~m}\) Wavelength of the wave, \(\lambda=\frac{\mathrm{c}}{\mathrm{f}}=\frac{3 \times 10^8}{9 \times 10^9}=\frac{1}{3 \times 10} \mathrm{~m}\)Number of waves \((\mathrm{N})=\frac{\text { length }}{\lambda}=\frac{1}{\underline{1}}=3 \times 10=30\)
283075
According to Huygens' principle, during refraction of light from air to a denser medium:
1 Wavelength decreases but speed increases
2 Wavelength increases but speed decreases
3 Wavelength and speed increases
4 Wavelength and speed decreases
Explanation:
: Speed of light in denser medium- \(\mathrm{v}_{\mathrm{m}}=\frac{\mathrm{c}}{\text { refractive index }(\mu)}\) Wavelength of light in denser medium- \(\lambda_{\mathrm{m}}=\frac{\lambda}{\mu}\)When light ray goes from air to denser medium, then its wavelength and speed decreases because every medium have a different velocity of light.
Karnataka CET-2017
WAVE OPTICS
283076
When the same monochromatic ray of light travels through glass slab and through water, the number of waves in glass slab of thickness 6 cm is same as in water column of height \(7 \mathrm{~cm}\). If refractive index of glass is 1.5 then refractive index of water is
1 1.258
2 1.269
3 1.286
4 1.310
Explanation:
: Given, \(\mu_{\mathrm{g}}=1.5, \mathrm{~h}_{\mathrm{g}}=6 \mathrm{~cm}, \mathrm{~h}_{\mathrm{w}}=7 \mathrm{~cm}\) Number of waves in glass slab \(\left(\mathrm{n}_{\mathrm{g}}\right)=\) No. of waves in water column \(\left(\mathrm{n}_{\mathrm{w}}\right)\) \(\mu_{\mathrm{g}} \mathrm{h}_{\mathrm{g}}=\mu_{\mathrm{w}} \mathrm{h}_{\mathrm{w}}\) Where, \(\mu_{\mathrm{g}}=\) refractive index of glass \(\mu_w=\) refractive index of water \(\mu_w=\frac{\mu_{\mathrm{g}} \mathrm{h}_{\mathrm{g}}}{\mathrm{h}_{\mathrm{w}}}-\frac{1.5 \times 6}{7}=1.286\)
MHT-CET 2017
WAVE OPTICS
283077
Huygens' wave theory of light cannot explain
1 Diffraction phenomena
2 Interference phenomena
3 Photoelectric effect
4 Polarization of light
5 Propagation of light
Explanation:
: Huygens' wave theory of light:- A wave front propagates by creating wavelets that move forwards and recreate the wave front. It explains diffraction phenomenon, interference phenomenon, polarization of light, propagation of light reflection and refraction of light. Hence, Huygens' wave theory of light cannot explain photoelectric effect because it is due to particle nature of light.
Kerala CEE - 2017
WAVE OPTICS
283078
For a radiation of \(9 \mathrm{GHz}\) passing through air. The number of waves passing through \(1 \mathrm{~m}\) length is
1 30
2 5
3 20
4 3
Explanation:
: Given that, \(\mathrm{f}=9 \mathrm{GHz}=9 \times 10^9 \mathrm{~Hz}\), length \(=1 \mathrm{~m}\) Wavelength of the wave, \(\lambda=\frac{\mathrm{c}}{\mathrm{f}}=\frac{3 \times 10^8}{9 \times 10^9}=\frac{1}{3 \times 10} \mathrm{~m}\)Number of waves \((\mathrm{N})=\frac{\text { length }}{\lambda}=\frac{1}{\underline{1}}=3 \times 10=30\)
283075
According to Huygens' principle, during refraction of light from air to a denser medium:
1 Wavelength decreases but speed increases
2 Wavelength increases but speed decreases
3 Wavelength and speed increases
4 Wavelength and speed decreases
Explanation:
: Speed of light in denser medium- \(\mathrm{v}_{\mathrm{m}}=\frac{\mathrm{c}}{\text { refractive index }(\mu)}\) Wavelength of light in denser medium- \(\lambda_{\mathrm{m}}=\frac{\lambda}{\mu}\)When light ray goes from air to denser medium, then its wavelength and speed decreases because every medium have a different velocity of light.
Karnataka CET-2017
WAVE OPTICS
283076
When the same monochromatic ray of light travels through glass slab and through water, the number of waves in glass slab of thickness 6 cm is same as in water column of height \(7 \mathrm{~cm}\). If refractive index of glass is 1.5 then refractive index of water is
1 1.258
2 1.269
3 1.286
4 1.310
Explanation:
: Given, \(\mu_{\mathrm{g}}=1.5, \mathrm{~h}_{\mathrm{g}}=6 \mathrm{~cm}, \mathrm{~h}_{\mathrm{w}}=7 \mathrm{~cm}\) Number of waves in glass slab \(\left(\mathrm{n}_{\mathrm{g}}\right)=\) No. of waves in water column \(\left(\mathrm{n}_{\mathrm{w}}\right)\) \(\mu_{\mathrm{g}} \mathrm{h}_{\mathrm{g}}=\mu_{\mathrm{w}} \mathrm{h}_{\mathrm{w}}\) Where, \(\mu_{\mathrm{g}}=\) refractive index of glass \(\mu_w=\) refractive index of water \(\mu_w=\frac{\mu_{\mathrm{g}} \mathrm{h}_{\mathrm{g}}}{\mathrm{h}_{\mathrm{w}}}-\frac{1.5 \times 6}{7}=1.286\)
MHT-CET 2017
WAVE OPTICS
283077
Huygens' wave theory of light cannot explain
1 Diffraction phenomena
2 Interference phenomena
3 Photoelectric effect
4 Polarization of light
5 Propagation of light
Explanation:
: Huygens' wave theory of light:- A wave front propagates by creating wavelets that move forwards and recreate the wave front. It explains diffraction phenomenon, interference phenomenon, polarization of light, propagation of light reflection and refraction of light. Hence, Huygens' wave theory of light cannot explain photoelectric effect because it is due to particle nature of light.
Kerala CEE - 2017
WAVE OPTICS
283078
For a radiation of \(9 \mathrm{GHz}\) passing through air. The number of waves passing through \(1 \mathrm{~m}\) length is
1 30
2 5
3 20
4 3
Explanation:
: Given that, \(\mathrm{f}=9 \mathrm{GHz}=9 \times 10^9 \mathrm{~Hz}\), length \(=1 \mathrm{~m}\) Wavelength of the wave, \(\lambda=\frac{\mathrm{c}}{\mathrm{f}}=\frac{3 \times 10^8}{9 \times 10^9}=\frac{1}{3 \times 10} \mathrm{~m}\)Number of waves \((\mathrm{N})=\frac{\text { length }}{\lambda}=\frac{1}{\underline{1}}=3 \times 10=30\)
283075
According to Huygens' principle, during refraction of light from air to a denser medium:
1 Wavelength decreases but speed increases
2 Wavelength increases but speed decreases
3 Wavelength and speed increases
4 Wavelength and speed decreases
Explanation:
: Speed of light in denser medium- \(\mathrm{v}_{\mathrm{m}}=\frac{\mathrm{c}}{\text { refractive index }(\mu)}\) Wavelength of light in denser medium- \(\lambda_{\mathrm{m}}=\frac{\lambda}{\mu}\)When light ray goes from air to denser medium, then its wavelength and speed decreases because every medium have a different velocity of light.
Karnataka CET-2017
WAVE OPTICS
283076
When the same monochromatic ray of light travels through glass slab and through water, the number of waves in glass slab of thickness 6 cm is same as in water column of height \(7 \mathrm{~cm}\). If refractive index of glass is 1.5 then refractive index of water is
1 1.258
2 1.269
3 1.286
4 1.310
Explanation:
: Given, \(\mu_{\mathrm{g}}=1.5, \mathrm{~h}_{\mathrm{g}}=6 \mathrm{~cm}, \mathrm{~h}_{\mathrm{w}}=7 \mathrm{~cm}\) Number of waves in glass slab \(\left(\mathrm{n}_{\mathrm{g}}\right)=\) No. of waves in water column \(\left(\mathrm{n}_{\mathrm{w}}\right)\) \(\mu_{\mathrm{g}} \mathrm{h}_{\mathrm{g}}=\mu_{\mathrm{w}} \mathrm{h}_{\mathrm{w}}\) Where, \(\mu_{\mathrm{g}}=\) refractive index of glass \(\mu_w=\) refractive index of water \(\mu_w=\frac{\mu_{\mathrm{g}} \mathrm{h}_{\mathrm{g}}}{\mathrm{h}_{\mathrm{w}}}-\frac{1.5 \times 6}{7}=1.286\)
MHT-CET 2017
WAVE OPTICS
283077
Huygens' wave theory of light cannot explain
1 Diffraction phenomena
2 Interference phenomena
3 Photoelectric effect
4 Polarization of light
5 Propagation of light
Explanation:
: Huygens' wave theory of light:- A wave front propagates by creating wavelets that move forwards and recreate the wave front. It explains diffraction phenomenon, interference phenomenon, polarization of light, propagation of light reflection and refraction of light. Hence, Huygens' wave theory of light cannot explain photoelectric effect because it is due to particle nature of light.
Kerala CEE - 2017
WAVE OPTICS
283078
For a radiation of \(9 \mathrm{GHz}\) passing through air. The number of waves passing through \(1 \mathrm{~m}\) length is
1 30
2 5
3 20
4 3
Explanation:
: Given that, \(\mathrm{f}=9 \mathrm{GHz}=9 \times 10^9 \mathrm{~Hz}\), length \(=1 \mathrm{~m}\) Wavelength of the wave, \(\lambda=\frac{\mathrm{c}}{\mathrm{f}}=\frac{3 \times 10^8}{9 \times 10^9}=\frac{1}{3 \times 10} \mathrm{~m}\)Number of waves \((\mathrm{N})=\frac{\text { length }}{\lambda}=\frac{1}{\underline{1}}=3 \times 10=30\)
