Question number 10 and 11

Question number 10 and 11 An element X has A-nev 16, elect•onic configuration. 4. Write four main symptoms of hepatitis. S. Give four properties 6. State one feature that is similar and one dissimilar with respect to mitochondria and plastids. 7,. What is meant by the term Calculato the number of moles in 3.011 x atoms Of C. 8. State three ways in which xylem is different from phloem. 9. Write three diseases caused by virus. 10. Define pressure and its SI unit. The dimension of a metallic cuboid are 30 cm 10 cm ox 15 cm and its mass is 20 kg. Calculate the pressure exerted by the cuboid, when it is resting on the face having sides 30 cm 10 cm on a V?ble. 11 The sound wave has a frequency of 2KHz and wavelength of 45 cm, it takes 4 sec. to travel. Calculate the distance it travels il 4 sec. 12. What is acid rain? Give its one harmful effect. 13. Explain Rutherford's a particle scattering experiment. [3 14. What are allbys? Explain with the help of example. 15. What are the different means by which infectious diseases are spread? 16. What is uniform circular motion? An athlete run on a Circular track, whose radius is 50 m Wit' a constant speed? It æc. to reach point B from starting point A. find (a) distance (b) (c) speed.

Dear student,
11. The speed of the sound wave is given by v = wavelength x frequency or v = λ x f

here, λ = 45cm = 0.45m

f = 2kHz = 2000 Hz

thus,

v = 0.45 x 2000 = 900 m/s

now, distance it travels in 4 sec will be

distance = speed * velocity
900 * 4 = 3600 m

Please ask another question in separate thread.

Regards