The frequency order for \(\gamma\) - rays (\(b\)), X – rays (\(a\)), and UV – rays (\(c\)) is:
1. | \( b>a>c \) | 2. | \( a>b>c \) |
3. | \( c>b>a \) | 4. | \( a>c>b\) |
The E.M wave with the shortest wavelength among the following is:
1. | Ultraviolet rays | 2. | X-rays |
3. | Gamma-rays | 4. | Microwaves |
Which colour of the light has the longest wavelength?
1. violet
2. red
3. blue
4. green
1. | gamma rays, ultraviolet, infrared, microwaves |
2. | microwaves, gamma rays, infrared, ultraviolet |
3. | infrared, microwave, ultraviolet, gamma rays |
4. | microwave, infrared, ultraviolet, gamma rays |
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
List -I (Electromagnetic waves) | List - II (Wavelength) |
(a) AM radio waves | (i) \(10^{-10}~\mathrm{m}\) |
(b) Microwaves | (ii) \(10^{2} \mathrm{~m}\) |
(c) Infrared radiation | (iii) \(10^{-2} \mathrm{~m}\) |
(d) X-rays | (iv) \(10^{-4} \mathrm{~m}\) |
(a) | (b) | (c) | (d) | |
1. | (ii) | (iii) | (iv) | (i) |
2. | (iv) | (iii) | (ii) | (i) |
3. | (iii) | (ii) | (i) | (iv) |
4. | (iii) | (iv) | (ii) | (i) |
The biological importance of the ozone layer is:
1. | it stops ultraviolet rays. |
2. | ozone layer reduces the greenhouse effect. |
3. | ozone layer reflects radio waves. |
4. | ozone layer controls \(\mathrm{O}_2 / \mathrm{H}_2\) ratio in the atmosphere. |