Draw a ray diagram to show the refraction of a monochromatic ray through a prism when it suffers minimum deviation.
The human ear can detect continuous sounds in the frequency range from 20 Hz to 20,000 Hz. Assuming that the speed of sound in air is 330 ms-1 for all frequencies; calculate the wavelengths corresponding to the given extreme frequencies of the audible range.
An enemy plane is at a distance of 300 km from a radar. In how much time the radar will be able to detect the plane? Take velocity of radio waves as x 108 ms-1.
How is the frequency of a stretched string related to:
(i) it’s length
(ii) it’s tension?
(i) The frequency of stretched string related with its length as:
(ii) The frequency of stretched string is related to tension in the string as:
v ∝ tension
This means frequency is inversely proportional to the length of the string and
directly proportional to its tension.
An electric bulb of 300 Ω draws a current of 0.4 A. Calculate the power of the bulb and the potential difference at its ends.