In comparing the camera and the human eye, the film of the camera function as the?
retina
iris
cornea
pupil
Correct answer is A
The retina is light sensitive layer living the inner wall of the eye where image is formed. in the camera, image is formed on a light sensitive film.
During a thunderstorm, the sound is heard over a long time. this phenomenon is referred to as?
diffraction of sound
refraction of sound
superposition
reveraberation
Correct answer is D
The lengthening effect of sound is known as reverberation.
the wavelength of sound becomes greater in the bottle
sound cannot pass through the bottle
sound needs a material medium
sound can pass through a vacuum
Correct answer is C
Sound wave requires a material medium for its propagation. so when air is being pumped out the density of the medium is being reduced and the sound dies down. when all the air has been pumped out of the glass, no sound will be heard, as sound sound cannot travel through vacuum
The wavelength of a wave traveling with a velocity of 420 ms-1 is 42 m. what is its period?
1.2 s
1.0 s
0.5 s
0.1 s
Correct answer is D
V = fλ
f = (v)/λ = (420)/42 = 10 HZ
Period, T = (1)/F = (1)/10 = 0.1 secs
Which of the following has no effect on radiation?
nature of surface
density
surface area
temperature
Correct answer is B
Radiation depends on nature of the surface area and temperature. It is independent of density.