Explanation

The brightness of the waveform on the screen of a Cathode Ray Oscilloscope (CRO) is primarily controlled by the potential of the cathode.

Here's why:

• Cathode Ray Tube (CRT)
• Electron Beam Intensity
• Potential of the Cathode

Explanation

• Jupiter takes approximately 4332.62 Earth days to complete one revolution around the Sun.
• Which is the longest revolution period of all the planets in our solar system.

Explanation

The sun rises in the East and sets in the West.

which means that the Earth is rotating from West to East. 

Earth revolves in orbit around the Sun in 365 days, 6 hours, 9 minutes.

with reference to the stars, at a speed ranging from 29.29 to 30.29 km/s.

The 6 hours, 9 minutes add up to about an extra day every fourth year,

which is designated a leap year, with the extra day added as February 29th.

Explanation

• Force is the only option that can change an object's speed.
• According to Newton's second law of motion, force is directly related to an object's acceleration, which is the change in speed over time.

Explanation

When handling a clinical thermometer, you should:

• Wash it before use (to ensure cleanliness and accuracy)
• Stay at one place (to avoid moving around and potentially breaking the thermometer)
• Place it in a cover after use (to protect the thermometer from damage and contamination)

But you should not Run while handling a clinical thermometer, as this could cause the thermometer to break or become damaged.

Explanation

 At the open end of an organ pipe, antinodes are formed. CK-12 Foundation

An antinode is a point of maximum displacement in a standing wave,

And since the air molecules at the open end of an organ pipe can vibrate freely, they create an antinode there. 

Explanation

When an object is placed at the focus of a convex lens, the refracted rays become parallel.

These rays do not converge to form a real image.

So technically, the image is formed at infinity and is real, inverted, and highly enlarged.

Therefore, the image will be real, formed at infinity.

Explanation

To find the divergence, calculate:

div(f) = ∂/∂x (3x^2) + ∂/∂y (5xy) + ∂/∂z (xyz^3)

= 6x + 5x + 3xyz^2

At (1, 2, 3):

div(f) = 6(1) + 5(1) + 3(1)(2)(3)^2

= 6 + 5 + 54

= 65

Explanation

Explanation

Clear nights are cooler than cloudy nights because of radiation. Here's why:

• On a clear night, the Earth's surface rapidly loses heat by radiating it into space, a process known as radiative heat loss. This causes the temperature to drop.
• On a cloudy night, the clouds act as an insulating blanket, trapping heat and preventing it from escaping into space. This reduces radiative heat loss and keeps the temperature warmer.