For a metal of work function 6.6 eV , which of the following wavelengths of incident radiation does not give rise to the photoelectric effect?
(Take Planck's constant as $6.6 \times 10^{-34} \mathrm{~J} \mathrm{~s}$ )
100 nm
150 nm
200 nm
50 nm
In a concave lens, a ray of light emanating from the object parallel to the principal axis of the lens after refraction:
passes through $2 F$, which is the radius of curvature of the lens.
appears to diverge from the first principal focus.
emerges parallel to the principal axis.
passes through the second principal focus.
A submarine is designed to withstand an absolute pressure of 100 atm . How deep can it go below the water surface?
(Consider the density of water $=1000 \mathrm{~kg} \mathrm{~m}^{-3}$, $1 \mathrm{~atm}=1 \times 10^5 \mathrm{~Pa}$ and gravitational acceleration $g=10 \mathrm{~m} / \mathrm{s}^2$ )
990 m
9900 m
99 m
9000 m
$$ \text { Match List I with List II: } $$
| List-I (Electromagnetic wave) |
List-II (Production) |
||
|---|---|---|---|
| A. | Microwave | I. | Electrons in atoms emit light when they move from a higher energy level to a lower energy level |
| B. | Visible light | II. | Radioactive decay of nucleus |
| C. | Gamma rays | III. | Vibration of atoms and molecules |
| D. | Infra-red rays | IV. | Klystron valve or magnetron valve |
A-III, B-I, C-II, D-IV
A-III, B-IV, C-I, D-II
A-IV, B-I, C-II, D-III
A-IV, B-III, C-II, D-I
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