# Tag: physics

### Questions Related to physics

Reflection at a free boundary implies

The equation of a progressive wave is given by $y=10 sin (5t-x)$. The wave gets reflected from a open boundary. The equation of the reflected wave is

A wave of frequency $100$ Hz is sent along a string towards a fixed end. When this wave travels back after reflection, a node is formed at a distance of $10$ cm from the fixed end of the string. The speeds of incident(and reflected) waves are?

A composition string is made up by joining two strings of different masses per unit length $\longrightarrow \mu $ and $4\mu.$ The composite string is under the same tension. A transverse wave pulse : $Y=(6 mm) \sin (5t+40x)$, where '$t$' is in seconds and '$x$' in meters, is sent along the lighter string towards the joint. The joint is at $x=0.$ The equation of the wave pulse reflected from the joint is

Which of the following statement is incorrect superposition of waves?

(i) After superposition frequency,wavelength and velocity of resultant wave remains same

(ii) After superposition amplitude of resultant wave is equal to amplitude of either wave

(iii) Mechanical wave cannot superposed with electromagnetic wave

(iv) For superposition two waves should have equal wavelength,frequency and amplitude

The wavelength of the first line of Lyman series is $\lambda$. The wavelength of the first line in Paschen series is ________.

A wave travels on a light string. The equation of the waves is $Y\, = \,A\, sin\,(kx\,-\,\omega\,t+\,30^{\circ})$. It is reflected from a heavy string tied to end of the light string at x = 0 . If 64% of the incident energy is reflected then the equation of the reflected wave is

A pulse of a wave train travels along a stretched string and reaches the fixed end of the string. It will be reflected back with :

A wave of length $2m$ is superposed on its reflected wave to form a stationary wave. A node is located at $ x=3m$ The next node will be located at $x=$

A sound wave of frequency $1360 Hz$ falls normally on a perfectly reflecting wall. The shortest distance from the wall at which the air particles have maximum amplitude of vibration is ($v = 340 m/s$)