The pitch of a note is not affected by
frequency
tension in a vibrating string
mass of a vibrating string
amplitude of sound wave
Correct answer is D
No explanation has been provided for this answer.
30°
45°
60°
90°
Correct answer is A
Formula for number of images = \(\frac{360}{n} - 1\)
where n is the angle of inclination.
Given the number of images = 11, we have
\(\frac{360}{n} - 1 = 11\)
\(\frac{360}{n} = 12\)
\(n = \frac{360}{12} =30°\)
Rainbow formation is a natural phenomenon illustrating that white light
splits into three components after rainfall
is dispersed by glass prisms
splits into its constituent colours before rainfall
is dispersed into its constituent colours after rainfall
Correct answer is D
A rainbow is caused by the dispersion of sunlight by tiny water droplets present in the atmosphere, which can be seen after the rain.
Which of the following electromagnetic waves is most energetic?
Radio waves
X-ray
Gamma rays
Ultra-violet rays
Correct answer is C
The gamma rays have the shortest wavelength and therefore, impart the highest photon energy.
meter per second
seconds
hertz
farad
Correct answer is C
The unit of frequency is hertz, abbreviated Hz.