Let two A.P's have the first terms a , a' and common difference d.
Given that difference between their 100th term is 100.
then a + 99d - a' - 99d = 100
⇒...
Ultrasonic waves are those waves which have frequency more than 20 kHz.
Bats use ultrasonic waves to fly and search for their prey at night without colliding.
Bat produces ultrasound waves in...
The longer the length of string, the farther the pendulum falls; and therefore, the longer the period, or back and forth swing of the pendulum. The greater the amplitude, or angle, the farther the pendulum falls;...
The correct answer is (a) A
EXPLANATION:
The resultant amplitude
y = A sin(⍵t-kx) + A sin(⍵t-kx+120°)
→y = 2A Sin(⍵t-kx+60°)*cos60°
→y = A sin(⍵t-kx+60°)
Hence the resultant amplitude is A.
(b) A and B move in opposite directions.
(d) The displacements at A and B have equal magnitudes.
EXPLANATION:
The frequencies of the particles will be the same, so the option (a) is...
The correct answer is (a) P1= P2
EXPLANATION:
Let the cross-section area = A, if the intensity of the first wave at this cross-section = I₁ and of the second wave =...
(d) When light enters from rarer (air) to denser (glass) medium wavelength and velocity will get affected. The velocity will decrease. Moreover, as the ray bent in passing through different...