atmospheric pressure is higher at the surface than at the higher altitudes
speed of sound is less than that of light
temperature of the atmosphere decreases with altitude
atmospheric density decreases with altitude
Correct answer is B
No explanation has been provided for this answer.
0.18m
0.50m
1.62m
18.00m
Correct answer is A
hi = \(\frac{ho \times v}{u} = \frac{1.8 \times 0.3}{3} = 0.18m\)
The image of an optical pin placed at the principal focus of a concave mirror will be formed
between the principal focus and the pole
at the centre of the curvature
between the principal focus and the centre of curvature
at infinity
Correct answer is D
No explanation has been provided for this answer.
dispersion
refraction
interference
diffraction
Correct answer is B
No explanation has been provided for this answer.
amplitude of the wave
wavelength of the wave
direction of vibration of the particles of the medium
period of vibration of the particle of the medium
Correct answer is C
No explanation has been provided for this answer.