Answer:
correct answer is option 5 (The emission by the incident electron when it loses its energy in a single emission)
Explanation:
The emission by the incident electron when it loses its energy in a single emission then X-rays of minimum wavelength which is also known as X-rays of cut-off wavelength are emitted.
If potential V is applied on coolidge tube then cut-off wavelength of the continuous X-ray spectrum is related to the accelerating potential V by following equation
Angstrom/V
The concepts used to solve this problem are sound power, area of ear drum, and inverse square law. First find the intensity
using inverse square law for different distances. Then find the area of the ear drum using the diameter and finally find the energy transferred to each ear drum in one second. Intensity is inversely proportional to the square of the distance from the source:

Here,
r = Distance from the source,




Now the expression for the Area of ear drum is



The expression for Sound power is

Replacing,


Therefore the energy reached per second is 
Answer:
Option C
Explanation:
Visible telescopes are the telescopes which are sensitive in the spectrum of the light in the visible range.
The visible light telescopes are of three types out of which the reflecting telescopes uses the mirror so as to collect light as much as it can.
Convex mirror is used in such telescopes to collect all the light that falls on it and then the mirror reflects the light back to the focus.
Thus the mirror acts a bucket of light for its collection and the helps to form the world's largest visible light telescope.
Answer:
Magnitude of resultant force is 1190.314 N
Direction of force is 13.352°
Explanation:
given data:
thrust force = 725 N
Angle = 32.4 degree
Let x is consider as positive direction
Resultant force in x direction is
Rx = 725 + 513cos32.4 = 1158.14 N
and Resultant force perpendicular to x direction is:
Ry = 513sin32.4 = 274.88 N
Magnitude of resultant force is

and resultant force direction is

D. no genetic diversity means organisms are vulnerable to diseases and environmental changes