Tag: science & technology

Non-luminous objects don't produce their own light but become visible by reflecting light from luminous sources into our eyes. This is how we see most everyday objects. Refraction bends light, radiation emits light, and absorption prevents reflection.

The Sun is approximately 150 million kilometers from Earth, and light travels at about 300,000 km/s. This gives a travel time of roughly 500 seconds, or 8 minutes 20 seconds. "Eight" is the closest correct answer among the options.

Albert Einstein won the Nobel Prize in Physics in 1921 for his discovery of the law of the photoelectric effect, not for relativity theory which was already well-established. Option A (special relativity) is a common misconception - relativity was too controversial and theoretical at the time. Option B is humorous trivia about his appearance, not a scientific achievement.

Electromagnetic radiation characterized by wavelength is called light (option C). Light is the visible portion of the electromagnetic spectrum. Sound is a mechanical wave requiring a medium, waves is too general, and kinetics refers to motion studies.

Energy emitted as waves from moving electric charges is electromagnetic radiation (option B). This is the fundamental definition - accelerating charges produce electromagnetic waves. Horse Power is power unit, thermal energy is heat, and static energy is stored charge.

Electromagnetic waves do NOT need matter to propagate - they can travel through vacuum (option B is True). This is a key property that distinguishes them from mechanical waves like sound. They propagate through oscillating electric and magnetic fields.

Humans cannot see all light waves (option B is False). The visible spectrum is only a small portion (400-700 nm) of the full electromagnetic spectrum. We cannot see ultraviolet, infrared, X-rays, radio waves, or other electromagnetic radiation.

The study of light is called Optics (option A). Optics is the branch of physics studying light behavior and properties. Laser is a device, photons are particles of light, and 'All of the Above' is incorrect since only Optics is the field of study.

The speed of light is 186,000 miles per second (option D). This is the correct value in imperial units. Options A, B, and C have wrong units (per minute, per hour) or wrong values. Light speed is a fundamental constant.

To solve this question, the user needs to have a basic understanding of Internet terminology.

Now, let's go through each option and explain whether it is an Internet term or not:

A. Cookies: This is an Internet term that refers to small data files stored on a user's computer by a website. These files are used to remember user preferences and login information when revisiting the website.

B. Spam: This is an Internet term that refers to unsolicited or unwanted messages, usually in the form of email, that are sent to a large number of recipients.

C. Netnannies: This is an Internet term that refers to software or services that help parents monitor and control their children's online activity.

D. Brownies: This is not an Internet term. It is a type of dessert.

Therefore, the answer is: D. Brownies is not an Internet term.