Trong thí nghiệm tán xạ alpha của Rutherford, chùm hạt alpha được bắn về phía hạt nhân của nguyên tử vàng. Trong các quỹ đạo như hình vẽ, hạt alpha không thể chuyển động theo quỹ đạo nào?

Trong một trường phổ thông cơ sở ở Hà Nội có 3 thầy giáo là Minh, Tuấn, Vinh dạy các môn Sinh vật, Địa lý, Toán, Lịch sử, Tiếng Anh và Tiếng Pháp, mỗi thầy dạy hai môn.

Người ta biết về các thầy như sau:

- Thầy dạy Địa và thầy dạy Tiếng Pháp là láng giềng của nhau (1).

- Thầy Minh trẻ nhất trong ba thầy (2).

- Thầy Tuấn, thầy dạy Sinh và thầy dạy Tiếng Pháp thường đi với nhau trên đường về nhà (3).

- Thầy dạy Sinh nhiều tuổi hơn thầy dạy Toán (4).

- Thầy dạy Tiếng Anh, thầy dạy Toán và thầy Minh khi rảnh rỗi thường hay đánh quần vợt với một thầy thứ tư (5).

Thầy Minh dạy môn gì?

Số đồng phân amino axit có công thức phân tử C₃H₇NO₂ là

Hàm số y = cosx nghịch biến trên mỗi khoảng?

Nghiên cứu về động vật, thực vật; tham gia thiết kế các phần mềm, máy móc liên quan đến cơ thể thực vật, động vật và người là hoạt động nghề nghiệp của ai?

Choose the correct answer that best writes using the prompts.

your last message, / you / want / know / my family routines.

Biết điện thế tại điểm M trong điện trường là 20V. Electron có điện tích e = -1,6.10^-19 C đặt tại điểm M có thế năng là:

Có 6 người sống ở các tầng khác nhau của một tòa nhà 6 tầng: A và B ở căn hộ có 1 phòng ngủ; C, D và E sống ở căn hộ có 2 phòng ngủ; F ở căn hộ có 3 phòng ngủ; căn hộ ở tầng 2 có 2 phòng ngủ; F sống ở tầng thấp hơn D; C sống ở tầng thấp hơn B; căn hộ ở tầng 5 hơn căn hộ ở tầng 3 một phòng ngủ.

A không thể sống ở tầng nào dưới đây?

Đâu là ý đúng khi nói về đặc điểm cấu tạo vỏ của vi khuẩn?

Tổng số các hạt proton, neutron và electron trong nguyên tử của một nguyên tố là 40. Biết số hạt neutron lớn hơn số hạt proton là 1. Cho biết nguyên tố trên thuộc loại nguyên tố nào?

Một trong những đặc điểm của Người tối cổ là gì?

Cho 5,9 gam amin đơn chức X tác dụng vừa đủ với dung dịch HC1, tạo ra 9,55 gam muối, số công thức cấu tạo ứng với công thức phân tử của X là

Xét hàm số \(y=\text{cos}x\) trên khoảng \(\left( \frac{\pi }{5};\frac{4\pi }{3} \right)\) đồng biến trên khoảng có độ dài là

Một vật có khối lượng 2kg và chuyển động với vận tốc 54km/h. Động lượng của vật bằng

Yếu tố nào ảnh hưởng tới độ cao xuất hiện và kết thúc của các vành đai thực vật?

Đổi số 97 hệ số thập phân sang hệ nhị phân được số?

Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each the numbered blanks from 31 to 35.

“One month on since the devastating earthquake hit Türkiye and Syria, the scale of the humanitarian response has yet to meet the enormous needs of displaced Syrian families and children (31)_____have suffered from compounded crises for almost 12 years now,” said Johan Mooij, director of World Vision’s Syria crisis response. “It is crucial that (32)_____ access channels to northwest Syria remain open, and that aid deliveries are scaled up through earmarked funding for the emergency response. Only this will ensure that children’s mental health needs are covered, and their trauma addressed.”

Snow and bitter winter weather have placed children at great risk of hypothermia (33)_____ they struggle to survive in sub-zero temperatures. Many survivors have had to sleep in cars, outside, or in makeshift shelters. Doctors (34)_____ that children are also at risk of exposure to waterborne diseases such as cholera or Hepatitis A due to the damage to shelters and water infrastructure.

These children are now even more vulnerable to family separation, exploitation, and abuse. As buildings are deemed unsafe, they also are unable to return to school.

“In northern Syria, in particular, the threats to children from abuse were already extreme. The soaring poverty, within a warzone, now devastated by earthquakes, has created an unimaginable number of challenges, and suffering for children,” says Johan, director of the Syria crisis response in Amman, Jordan. “This earthquake has created the perfect environment for a health crisis -fueled by reduced healthcare capacity and disease (35)_____.”

Mark the letter A, B, C or D on your answer sheet to indicate the best arrangement of utterances or sentences to make a meaningful exchange or text in each of the following questions from 13 to 17.

a. Since more people care about the environment, which makes me hopeful, many shops now sell products that are designed to be part of the circular economy.

b. When I bought my water bottle last year, I chose one that will last a long time because it is made from strong materials that don't harm nature.

c. Although many items end up in the trash after we use them, some clever designers are creating things that can be fixed or recycled when they break.

d. If we build phones that are easy to repair, which saves us money, we won't need to buy new ones so often.

e. When companies make products that can be reused, they help our planet stay clean and healthy.

Read the following passage about endangered languages and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questionsfrom 31 to 40.

[I] Social media has become a dominant force in modern communication, offering a range of benefits and challenges. [II] It has revolutionized the way people interact, share information, and even form relationships. [III] While these platforms offer opportunities for connection and expression, they also have their drawbacks. [IV] For instance, excessive use of social media has been linked to a range of negative effects, including mental health issues, social isolation, and decreased productivity. [V] However, when used responsibly, social media can also offer a variety of positive outcomes, such as the ability to stay connected with loved ones, network professionally, and access valuable information and resources.

One of the major benefits of social media is its ability to keep people connected. For example, individuals who live far apart can maintain close relationships through regular communication on these platforms. Social media also facilitates professional networking, allowing users to connect with potential employers or clients, and enabling companies to promote their products and services to a global audience. Additionally, platforms like Facebook, Twitter, and Instagram provide a space for people to share ideas, opinions, and creative work, fostering a sense of community and collaboration.

Despite these advantages, there are serious concerns about the negative impact of social media, particularly on mental health. Studies have shown that excessive social media use can contribute to feelings of anxiety, depression, and loneliness. This is often attributed to the unrealistic portrayals of life that are commonly shared on these platforms, leading to comparisons that can make individuals feel inadequate or left out. Furthermore, constant exposure to negative news or online bullying can exacerbate these feelings and contribute to long-term psychological stress.

Another issue with social media is its potential to distract people from their daily responsibilities. With notifications constantly popping up and endless streams of content to scroll through, individuals may find it difficult to focus on tasks such as work, school, or personal obligations. This can result in decreased productivity and a lack of attention to important matters.

Ultimately, the impact of social media depends on how it is used. If individuals are mindful of their usage patterns and take steps to limit their time on these platforms, they can enjoy the benefits of staying connected and informed without the negative consequences. Parents, educators, and mental health professionals can also play a role in helping young people develop healthy habits and manage their social media use effectively.

The word "these" in paragraph 3 refers to _______.

Read the following passage about the The Importance of Social Media in Modern Society and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions from 31 to 40.

In the 21st century, social media has become a crucial element of everyday life[I]. Platforms such as Facebook, Twitter, Instagram, and TikTok link individuals around the world, [IV]. Although some may critique social media for promoting negativity, it is important to acknowledge its numerous positive effects on society[III]. This essay will delve into the importance of social media, its influence on shaping public perception, and the challenges it poses.[II]

One of the primary benefits of social media is its ability to foster communication and connection. People can maintain relationships with friends and family, regardless of geographical barriers. This aspect is particularly vital for those who live far away from loved ones. For example, a student studying abroad can easily share their experiences with family through posts, photos, and video calls. Furthermore, social media enables individuals to connect with like-minded people and build communities around shared interests or causes. Activist groups, for instance, often use social media platforms to rally support for important issues, raising awareness and mobilizing action more efficiently than traditional methods.

Moreover, social media serves as a powerful tool for information dissemination. News spreads rapidly through these platforms, allowing individuals to stay informed about current events. During emergencies, such as natural disasters, social media can provide crucial information in real time, helping people stay safe and informed. However, this rapid dissemination of information also raises concerns about the accuracy and reliability of the content being shared. Misinformation can spread just as quickly as legitimate news, leading to confusion and mistrust.

Despite the challenges posed by misinformation, social media plays a significant role in shaping public opinion. People often turn to these platforms to voice their opinions and engage in discussions on various topics. For instance, political debates and social movements frequently gain traction through social media, allowing individuals to express their views and influence others. This democratization of discourse can empower marginalized voices and facilitate social change. However, it is crucial to approach online discussions critically, as echo chambers can form, reinforcing existing beliefs rather than encouraging open dialogue.

In conclusion, while social media presents challenges such as misinformation and polarized discussions, its positive contributions to communication, information dissemination, and social activism cannot be overlooked. As society continues to evolve, it is essential to harness the potential of social media while being mindful of its pitfalls. By promoting responsible use and critical thinking, we can maximize the benefits of social media and foster a more connected and informed society.

The word “democratization” in paragraph 4 is OPPOSITE in meaning to_______.