Chapter 15: Problem 2209
is responsible for the green house effect (A) infrared rays (B) ultraviolet rays (C) x rays (D) radiowaves
Chapter 15: Problem 2209
is responsible for the green house effect (A) infrared rays (B) ultraviolet rays (C) x rays (D) radiowaves
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Get started for freeIf \(\mathrm{V}_{\mathrm{r}}, \mathrm{V}_{\mathrm{x}}\) and \(\mathrm{V}_{\mathrm{m}}\) are the velocity of the \(\gamma\) rays, \(\mathrm{x}\) rays, micro waves respectively in space, then (A) \(\mathrm{V}_{\gamma}<\mathrm{V}_{\mathrm{x}}<\mathrm{V}_{\mathrm{m}}\) (B) \(\mathrm{V}_{\mathrm{r}}=\mathrm{V}_{\mathrm{x}}=\mathrm{V}_{\mathrm{m}}\) (C) \(\mathrm{V}_{\mathrm{r}}^{\prime}>\mathrm{V}_{\mathrm{x}}>\mathrm{V}_{\mathrm{m}}\) (D) \(\mathrm{V}_{\mathrm{r}}>\mathrm{V}_{\mathrm{x}}<\mathrm{V}_{\mathrm{m}}\)
Dimensional formula of intensity of radiation is (A) \(\mathrm{M}^{1} \mathrm{~L}^{2} \mathrm{~T}^{-2}\) (B) \(\mathrm{M}^{1} \mathrm{~L}^{0} \mathrm{~T}^{-2}\) (C) \(\mathrm{M}^{1} \mathrm{~L}^{2} \mathrm{~T}^{-3}\) (D) \(\overline{\mathrm{M}^{1} \mathrm{~L}^{0} \mathrm{~T}^{-3}}\)
When a plane electromagnetic wave travels in vacuum, the average electric energy density is given by \(\left(E_{0}\right.\) is the amplitude of the electric field) (A) \((1 / 4) \varepsilon_{0} E_{0}^{2}\) (B) \((1 / 2) \varepsilon_{0} E_{0}^{2}\) (C) \(2 e_{\mathrm{o}} \mathrm{E}_{\mathrm{O}}^{2}\) (D) \(4 \varepsilon_{0} E_{0}^{2}\)
Electromagnetic wave is produced by oscillating electric and magnetic fields \(E^{-}\) and \(B^{-}\). Choose only the incorrect statement from the following (A) \(\mathrm{E}^{-}\) is perpendicular to \(\mathrm{B}^{-}\). (B) \(E^{-}\) is perpendicular to the direction of propagation of the wave (C) \(\mathrm{B}^{-}\) is perpendicular to the direction of propagation of the wave (D) \(E^{-}\) is parallel to \(\mathrm{B}^{-}\)
The frequencies of \(\mathrm{x}\) rays, \(\gamma\) rays and ultraviolet rays are
respectively \(\mathrm{p}, \mathrm{q}\) and \(\mathrm{r}\) then
(A) \(pr\)
(B) \(p>q, q>r\)
(C) \(p>q, q
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