When temperature of an ideal gas is increased from 27°C to 227°C, its rms speed is changed from 400 m/s to vs Then, vs is
516 m/s
450 m/s
310 m/s
746 m/s
A prism of refractive index has a refracting angle of 60°. At what angle a ray must be incident on it so that it suffers a minimum deviation.
450
600
900
1800
The radius of the convex surface of planoconvex lens is 20 cm and the refractive index of the material of the lens is 1.5. The focal length is
30cm
50 cm
30 cm
40 cm
If work function of a metal is 4.2 eV, the cut off wavelength is
8000 Ao
7000 Ao
1472 Ao
2950 Ao
The work function of sodium is 2.3 eV. The threshold wavelength of sodium will be
2900 Ao
2500 Ao
5380 Ao
1200 Ao
A short linear object of length b lies along the axis of a concave mirror of focal length ' f ' at a distance 'u' from the pole of the mirror, what is the size of image?
The minimum wavelength of X-ray emitted by X-ray tube is 0.4125 Ao. The accelerating voltage is
30 kV
50 kV
80 kV
60 kV
The refractive index of the material of the prism and liquid are 1.56 and 1.32 respectively. What will be the value of 0 for the following refraction?
B.
Using the formula
What should be the minimum value of refractive index of the material of the prism for the reflections to take place as shown in the figure?
1.7
1.4
1.2
2.7
A person who can see things most clearly at a distance of 10 cm, requires spectacles to enable to see clearly things at a distance of 30 cm. What should be the focal length of the spectacles?
15 cm (Concave)
15 cm (convex)
10 cm
0