Two waves are approaching each other with a velocity of 20 m/s and frequency n. The distance between two consecutive nodes is:

Two waves are said to be coherent, if they have:

A standing wave having 3 nodes and 2 antinode is formed between two atoms having a distance 1.21Å between them. The wavelength of the standing wave is:

With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are:

A hospital uses an ultrasonic scanner to locate tumours in a tissue. The operating frequency of the scanner is 4.2 MHz. The speed of sound in a tissue is 1.7 km/s. The wavelength of sound in tissue is close to:

A pointer source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distance of 2m and 3m respectively from the source. The ratio of the intensities of the waves at P and Q is:

A wave in a string has an amplitude of 2cm. The wave travels in the +ve direction of x axis with a speed of 128 ms^-1 and it is noted that 5 complete waves fit in 4 m length of the string. The equation describing the wave is:

A star  emitting radiation at a wavelength of 5000Å is approaching the earth with a velocity of 1.50 × 10⁶ m/s. The change in wavelength of the radiation as received on the earth is:

What is the effect of humidity on sound waves when humidity increases?

Two waves of same frequency and intensity superimpose on each other in opposite phases. After the superposition, the intensity and frequency of waves will: