## 📅 How Many Months Have 28 Days?

All of the 12 months of the year have at least 28 days and a maximum of 31 days. Some months have 30 days how many have 28 The calendar used in the modern world is created based on the Gregorian calendar named after Pope Gregory XIII. As per the Gregorian calendar, a year is divided in 12 months such that every month has at least 28 days and a maximum of 31 days. In this calendar, the month of February has the lowest number of days that is 28 in a normal year while 29 in a leap

## How Long Would It Take To Fly Around The World?

It would take approximately 45 hours to fly around the world in a commercial flight plane. Let’s understand how we calculated this flying time. Before calculation, we made few assumptions such as We are assuming that the plane will fly over the equatorial circumference of Earth which is about 24,901 miles (40,075 km). We have taken Boeing 787 also known as Dreamliner for the calculations. The average speed of a Boeing 787 commercial plane is considered as 561 mph (903 km/h). The airplane has sufficient fuel tanks to cover the circumference of the earth which means the airplane does

## Where Do Electrons Come From?

The free electrons in a circuit come from the outermost shell of atoms present in the conducting material. The conducting wire is made up of atoms surrounded by electrons. The electrons cannot be created nor be destroyed. The electrons present at the outermost levels of the atom are loosely bond which allows them to move freely. The metal atoms become positively charged when these free electrons leave atoms. These freely moving electrons form a sea of electrons. In an open loop, this sea of electrons moves randomly. But when the potential difference is applied across the wire, these electrons

## Why Are Metals Shiny?

Metals are shiny because of the light re-emitted (or reflected) by the vibrations of free electrons present on the surface of the metals. When light falls on the metal surface, the photons of light are absorbed by the free electrons and these electrons move from one energy level to higher energy level. As the electron again drops back to lower energy level, it emits energy in the form of photons. This movement of electrons from lower to higher energy levels and vice versa causes electrons to vibrate at the atomic level. The wavelength of energy emitted by the electrons

## Where Is Quicksand Found?

Quicksand is a saturated sediment mixture of water and granular sand, commonly found near beaches, marshes, swamps, lakes, waterfalls, creek banks, and underground springs. Basically, they can be found in any location which has loose grainy sand and water resource. Quicksand is formed when water gets trapped in the grainy soil and forms a saturated mixture that appears solid until a sudden agitation in the sand cause liquefaction and it loses its strength.

## What is a Lightship?

A lightship is a floating ship that acts as a lighthouse to assist and warn other ships in navigation, basically replacement for lighthouse tower. The first lightship in the United States was placed at the Chesapeake Bay in 1820. Lightships were generally deployed in those areas where the construction of lighthouse towers was not feasible. Along with a powerful beam of light, some lightships are also equipped with warning bells that can be heard up to the distance of 15 miles (24 km), even if they are submerged 18 feet in the water.

## 77% of New Zealand’s Southern Alps Glaciers are lost

The study conducted by the scientists of the University of Leeds on 400 mountain glaciers found that the Southern Alps of New Zealand has lost about 77% volume of the glaciers from Little Ice Age. It is also found that climate change is responsible for the loss of these glaciers and the rate of ice loss in New Zealand’s Southern Alps Glaciers has increased two times in the last 40 years. Results also suggested that the Southern Alps have surpassed the tipping point of “peak water” on which local communities depend on freshwater, hydropower, and irrigation.

## What is Mauritius Oil Spill, and why it is considered as the worst ecological Disaster?

On 25 July 2020, a Japanese ship called MV Wakashio carrying an estimated 4,000 tonnes of oil, struck a coral reef and spilled more than 1,000 tonnes of oil in the offshores of Pointe d’Esny, south of Mauritius. Scientists have called this MV Wakashio oil spill as the country’s worst ecological disaster because the oil spill took place near two protected marine ecosystems, and Blue Bay Marine Park reserve which is home to turtles, 72 species of fish and 38 coral species. Most of the mammals including birds can die from hypothermia due to oil spills.

## What Determines The Color Of Light?

The color of the light is determined by its wavelength. The color of objects we see is actually the wavelength of the light that it reflects towards our eyes and this wavelength is determined by the energy of light absorbed and emitted by that object. The color of green leaves appears to be green because it absorbs the light and re-emit the photons having a wavelength of green color (520-565 nm). Different colors have different wavelengths. For example, Red color has the longest wavelength (625-740 nm) while the violet color has the shortest wavelength (380-430 nm).

## Does Electricity Have Mass?

Electricity does not have mass because electricity is just a flow of electrons and these electrons are already present in the conducting object. Therefore, the mass of the object remains the same independent of electricity. In our everyday life, we can notice that the weight of the wire remains constant before and after applying current. However, in the case of static charge, the surface of material gains extra electrons but the mass of the electron is almost negligible approximately 9.11× 10−31 kg. Therefore, it does not make sense to weigh the mass of electricity.