Physics
(a) After emission of an α-particle and two β-particles from an element 92P238, we get another element bRa. What is the relation between P and R ?
(b) Name the radiation which is used in carbon dating.
Related Questions
(a) Calculate the work done when
I. a 20 kg weight is lifted 2 m vertically
II. a bike is moved on a rough road through 35 m against a frictional resistance of 20 N. (g = 9.8 ms-2 )
(b) What is the work done by a force when the force is:
I. normal to the displacement produced.
II. in the same direction as the displacement produced?
A person standing in front of a cliff fires a gun and hears its echo after 3s. If the speed of sound in air is 336 ms-1
(a) Calculate the distance of the person from the cliff.
(b) After moving a certain distance from the cliff, he fires the gun again and this time the echo is heard 1.5 s later than the first. Calculate distance moved by the person.
(a) Name the phenomenon involved in tuning a radio set to a particular station
(b) Define the phenomenon named by you in part (a) above.
(c) What do you understand by loudness of sound?
(d) In which unit is the loudness of sound measured?
Hema uses two appliances in her home. One appliance is rated at 100 W and operates at 220 V, while the other appliance is rated at 60 W and also operates at 220 V. These appliances are connected to the electrical main supply in both series and parallel configurations, as shown in the figure 1 and 2.
(a) Calculate the total power consumption when the two appliances are connected in series.
(b) Calculate the total power consumption when the two appliances are corrected in parallel.
(c) Which configuration results in higher total power consumption, series or parallel?