Which of the following observations cannot be explained using the rectilinear propagation of light?
production of images by a pinhole camera
production of real images of objects by lenses
formation of an annular eclipse
diffraction patterns of light
Correct answer is B
No explanation has been provided for this answer.
The eclipse of the moon occurs when the
moon comes exactly between the earth and the sun
earth comes exactly between the moon and the sun
sun comes exactly between the earth and the moon
moon reflects all the rays from the sun onto the earth
Correct answer is B
No explanation has been provided for this answer.
A note of frequency 2000Hz has a velocity of 400 ms-1. calculate the wavelength of the note
5.0m
2.0m
0.5m
0.2m
Correct answer is D
\(\pi = \frac{v}{f} = \frac{400}{2000} = 0.2m\)
The S.I units of frequency, period and amplitude of a wave are respectively
hertz, second and centimeter
second, metre and hertz
metre, hertz and seconds
hertz, second and metre
Correct answer is D
No explanation has been provided for this answer.
The temperature of a liquid falls after some of it has evaporated because
the liquid left is smaller in volume and the breeze easily cools it
the more energetic molecules have escaped into the atmosphere
the liquid left has less latent heat
after evaporation impurities are left behind
Correct answer is B
No explanation has been provided for this answer.