Physics

X different wavelengths may be observed in the spectrum from a hydrogen sample if the atoms are excited to states with principal quantum number n = 6? The value of X is_______.

A tuning fork is vibrating at 250 Hz. The length of the shortest closest organ pipe that will resonate with the tuning fork will be_____cm.

(Take speed of sound in air as 340 ms^-1)

A capacitor of 50   $\mu F$  is connected in a circuit as shown in figure. The charge on the upper plate of the capacitor is__________   $\mu C.$

A plane electromagnetic wave with frequency of 30 MHz travels in free space. At particular point in space and time, electric field is 6 V/m. The magnetic field at this pint will be x * 10^-8T. The value of x is_______.

A car is moving on a plane inclined at 30° to the horizontal with an acceleration of 10ms^-2 parallel to the upward. A bob is suspended by a string from the roof of the car. The angle in degree which the string makes with the vertical is______. (Take g = 10ms^-2)

A square shaped wire with resistance of each side   $3\Omega$  is bent to form a complete circle. The resistance between two diametrically opposite points of the circle in unit of   $\Omega$  will be________.

A heat engine operates between a cold reservoir at temperature T₂ = 400K and a hot reservoir at temperature T₁. It takes 300J of heat from the hot reservoir and delivers 240J of heat to the cold reservoir in a cycle. The minimum temperature of the hot reservoir has to be________K.

The voltage drop across $15\Omega$ resistance in the given figure will be_______V.

The ratio of the equivalent resistance of the network (shown in figure) between the points a and b when switch is open and switch is closed in x : 8. The value of x is_________.

The voltage drop across   $15\Omega$  resistance in the given figure will be_______V.